Instruction manual HIMS / HTG and vapour pressure (P3 ... · Page 6 Introduction Instruction manual...

Instruction manual HIMS / HTG and vapour pressure (P3) measurement

Instruction manual

HIMS / HTG and vapour

pressure (P3) measurement

July 2014

Part no. 4416645

Rev. 2

Enraf B.V.

P.O. Box 812

2600 AV Delft

Netherlands

Tel. : +31 15 2701100

Fax : +31 15 2701111

E-mail : [email protected]

Website: : www.honeywellenraf.com

mailto:[email protected]

http://www.honeywellenraf.com/


Copyright 2014 Enraf B.V. All rights reserved.

Reproduction in any form without the prior consent of Enraf B.V. is not allowed. This manual is for information

only. The contents, descriptions and specifications are subject to change without notice. Enraf B.V. accepts no

responsibility for any errors that may appear in this manual.

The warranty terms and conditions applicable in the country of purchase in respect to Enraf B.V. products are

available from your supplier. Please retain them with your proof of purchase.


Preface

Preface

This manual is intended for technicians involved with the commissioning and service of the Honeywell Enraf

gauges with the optional HCU board or ICU_HPI board installed for the function of HIMS (Hybrid Inventory

Measurement System), HTG (Hydrostatic Tank Gauge) and vapour pressure measurement with pressure

transmitter P3.

A description preceding the technical procedures gives the technical information necessary to understand its

functioning. It is recommended to read this description prior to performing any of the procedures.

Safety and prevention of damage

Refer to the chapter Safety in the instruction manual of the applicable instrument (servo/radar gauge or indicator)

for detailed safety instructions.

"Warnings", "Cautions", and "Notes" have been used throughout this manual to bring special matters to the

immediate attention of the reader.

• A Warning concerns danger to the safety of the technician or user;

• A Caution draws attention to an action which may damage the equipment;

• A Note points out a statement deserving more emphasis than the general text, but does not deserve a

"Warning" or a "Caution".

The sequence of steps in a procedure may also be important from the point of view of personal safety and

prevention of damage; it is therefore advised not to change the sequence of procedural steps or alter a

procedure.

Legal aspects

The information in this manual is the copyright property of Enraf B.V., Netherlands.

Enraf B.V. disclaims any responsibility for personal injury or damage to equipment caused by:

• Deviation from any of the prescribed procedures;

• Execution of activities that are not prescribed;

• Neglect of the general safety precautions for handling tools, use of electricity and microwave radiation.

EC declaration of conformity

The Honeywell Enraf instrument, in which the optional HCU or ICU_HPI board is installed, is in conformity with

the protection requirements of EC Council Directive 93/68/EEC. Refer to the CE declaration of conformity

delivered with the instrument.

Additional information

Please do not hesitate to contact Enraf or its representative if you require additional information.

Table of contents


Table of contents

Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.1 HCU board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.2 ICU_HPI board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3 Overview of functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.4 HCU compatibility . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.4.1 Replacement or adding optional board in 854 ATG or 854 XTG servo gauges . . . . . . . . . . 8

1.4.2 Replacement or adding optional board in 873 SmartRadar . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.4.3 Replacement or adding optional board in 877 FDI Field Display & Interface . . . . . . . . . . . . 8

1.5 Optional functions in this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2 HIMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1 Introduction into HIMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1.1 HIMS calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.1.2 Corrections for ambient air and vapour density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.2 Commissioning of HIMS system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2.1 Selecting pressure and density dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2.2 Tank and gauge data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.2.3 Set-up and configuration of the pressure transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.2.4 Zero calibration of the pressure transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.2.5 Compensation for pressure transmitter P1 position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.3.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.3.2 Manual inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

2.3.3 Data items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3 HTG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.1 Introduction into HTG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.1.1 HTG calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.1.2 Volume and Mass calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

3.1.3 Corrections for ambient air and vapour density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

3.2 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.2.1 Selecting pressure and density dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

3.2.2 Tank and gauge data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

3.2.3 Alarm settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

3.2.4 Ullage readout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.2.5 Set-up and configuration of the pressure transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

3.2.6 Zero calibration of the pressure transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.2.7 Compensation for pressure transmitter P1 - P2 distance . . . . . . . . . . . . . . . . . . . . . . . . . . 26

3.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3.3.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3.3.2 Manual inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

3.3.3 Data items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28


Table of contents

4 Vapour pressure (P3) measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.1 Introduction into vapour pressure measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

4.2 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4.2.1 Selecting pressure dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

4.2.2 Gauge data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.2.3 Set-up and configuration of the pressure transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.2.4 Zero calibration of the pressure transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.3.1 Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.3.2 Manual input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

4.3.3 Data items . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

5 Maintenance and troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.2 Troubleshooting HIMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.3 Troubleshooting HTG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

5.4 Troubleshooting vapour pressure (P3) measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5.5 Hydrostatic error request (item EH) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5.6 Hydrostatic status request (item QF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5.7 HART device pointer (items VP and VV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Appendix A ASCII table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Appendix B1 Assessment of distance LP for HIMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Appendix B2 Assessment of distance LP (and LS) for HTG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Appendix C Local gravity constant (item LG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Appendix D Ambient air density (item RF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

Appendix E Vapour density (items RG and RJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45

Appendix F1 Define values for hydrostatic deformation (items IF and IL) for HIMS . . . . . . . . . . . . . . . . 46

Appendix F2 Define values for hydrostatic deformation (items IF and IL) for HTG . . . . . . . . . . . . . . . . . 47

Appendix G SET-up and Configuration procedure for HART® pressure transmitters with the HART

Communicator model 275 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Appendix H Zero calibration of pressure transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Appendix J Related documents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Introduction


1 Introduction

1.1 HCU board

The optional HCU board is used in Honeywell Enraf servo gauges 854 ATG, 854 XTG, 873 SmartRadar and Field Indicator 877 FDI to interface optional equipment as:

• spot temperature element;

• average temperature element;

• water bottom probe;

• pressure transmitters.

and to provide for an analog level output.

This option board has two HART® channels:

• HART® input 1, standard used for the Honeywell Enraf 762 VITO Interface;

• HART® input 2, standard used for the connection of pressure transmitters for HIMS™, HTG or vapour

pressure measurement.

Note 1:

HTG: Hydrostatic Tank Gauging; only applicable with 877 FDI. HIMS is available with the level gauges (servo and radar). Vapour pressure measurement is mostly performed on pressurized vessels with the level gauges.

Note 2:

Standard, the 762 VITO Interface is connected to HART input 1 and pressure transmitters are connected to HART input 2 of the optional HCU board.

It must be verified that the maximum values for current and power of the HCU option board HART input 2 circuit are not exceeding the maximum values of the connected HART® pressure transmitters. If the values of HART input 2 circuit are too high, then connect the pressure transmitters to HART input 1 and the 762 VITO Interface to HART input 2 (only possible when HART input 1 is available).

1.2 ICU_HPI board

The optional ICU_HPI board is used in Honeywell Enraf 973 SmartRadar LT, 971 SmartRadar LTi and 970

SmartRadar ATi to interface optional equipment as:

• spot temperature element;

• average temperature element;

• water bottom probe;

• pressure transmitters.

Note:

Analog level output with the 97x SmartRadar is provided by the optional ICU_HPO board.

For a description of these functions, refer to section 1.1.

The ICU_HPI board has the same input functions as the HCU board; the only difference is its shape, which

makes it to fit in the 97x SmartRadar.


Introduction

1.3 Overview of functions

The HCU / ICU_HPI option board has the following hardware channels:

• SPOT input: for spot temperature element (RTD) Pt100

• HART input 1: for 762 VITO Interface

• HART input 2: for HART® pressure transmitters and/or external water bottom probe

• 4-20 mA output: for analog level output (only with HCU option board)

The hardware combinations, together with software emulations gives in total 8 different models according to the

table below:

Sales code

for option

Function with HCU and ICU_HPI option board

Emulation mode

B

Spot temperature Pt100

TPU-2 / HSU

C

VITO temperature and/or water probe

HPU

J

VITO temperature and/or water probe + HART device(s)

HPU

U

Spot temperature + HART device(s)

HSU

V

Analog level output

MPU

W

Analog level output + VITO temperature and/or water probe

HCU

X

Analog level output + VITO temperature probe

MPU

Y

Analog level output + Spot temperature Pt100 +

VITO temperature and/or water probe + HART device(s)

HCU

Notes: 1 Option codes: V, W and X are not available with the 970 / 971 / 973 SmartRadar types as the analog level

output is provided by the ICU_HPO option board.

2 Please note that with option code Y in the 970 / 971 / 973 SmartRadar types, the analog level output is provided by the ICU_HPO option board.

3 Option code Y is not available in the 854 XTG servo gauge.

4 Option code U can only be available in the 854 XTG servo gauge without connection for 977 TSI Tank Side Indicator (in 854 ATG connection for 977 TSI is possible).

5 HART devices can be: - HART® pressure transmitters for HIMS / HTG configuration or vapour pressure measurement;

- HART® water bottom sensor e.g. Side mounted water probe.

6 With sales code Y (all HCU functions), the spot temperature measurement is disabled if the VITO temperature (and water) probe is present.

1.4 HCU compatibility

The HCU board can be used to replace an existing optional board in the 854, 873 and 877 gauges. However, it

requires some checking if more boards in the instrument must be updated or external equipment must be

replaced. The HCU board can be used to replace the following optional boards:

• HPU board (for average temperature measurement, restricted to MTT or VITO probes only)

• HSU board (for spot temperature measurement, restricted to Pt100 RTD’s only)

Note:

Read carefully the installation guide of the HCU board before starting to replace the existing option board.

Introduction


1.4.1 Replacement or adding optional board in 854 ATG or 854 XTG servo gauges

The HCU optional board requires an XPU-2 board in the 854 ATG and 854 XTG servo gauges. If there is no

XPU-2 board installed, then the installed XPU (or XPU-1) board must be replaced by an XPU-2 board.

Notes:

1 When the HCU board is used to replace an optional board with average temperature measurement, please note the following: The 863 MRT with 862 MIR or the 864 MTT with 862 MIT temperature connection cannot be maintained. • The 864 MTT can be connected to the 762 VITO-MTT Interface for connection to the HCU board; • The 863 MRT can be connected to the 762 VITO-MRT Interface for connection to the HCU board.

2 The optional data transmission channel on the XPU-2 (i.s. channel for 977 TSI or RS-232C/RS-485 channel) is only possible when backplane-2 is installed. Backplane-2 is standard installed in instruments • 854 ATG with series number: 854-20-400 and higher; • 854 XTG with series number: 894-02-001 and higher.

1.4.2 Replacement or adding optional board in 873 SmartRadar

The HCU optional board can be installed in the 873 SmartRadar without any problem.

Refer to Note 1 section 1.4.1.

1.4.3 Replacement or adding optional board in 877 FDI Field Display & Interface

The HCU optional board can be installed in an 877 FDI Field Display & Interface when there is an XPU or XPU-1

board. However, be informed that water bottom measurement with the VITO probe or Side mounted water probe

is not possible. If this function is required, then the installed XPU (or XPU-1) board must be replaced by an

XPU-2 board. Refer to note 1 in section 1.4.1.

Notes:

1 Please be aware that an XPU-2 board in the 877 FDI does not have the ability to ‘listen’ to the Enraf Fieldbus signals. Hence, the “Indicator” functionality is not available. It will then function as an HTG or ‘Stand Alone’ temperature gauge.

2 The optional data transmission channel on the XPU-2 (i.s. channel for 977 TSI or RS-232C/RS-485

channel) is only possible when backplane-2 is installed. Backplane-2 is standard installed in indicators 877 FDI with series number: 877-17-001 and higher.

1.5 Optional functions in this manual

This instruction manual describes the optional functions for:

• HIMS (Hybrid Inventory Measurement) chapter 2

• HTG (Hydrostatic Tank Gauging) chapter 3

• Vapour pressure (P3) measurement chapter 4

The optional functions for temperature and water bottom measured are described in the instruction manual:

VITO interface and average temperature (and water) probes for 854 servo, 97x SmartRadar and 877 FDI.


HIMS

2 HIMS

2.1 Introduction into HIMS

The HIMS (Hybrid Inventory Management System) combines the direct mass measurement as used with HTG

(Hydrostatic Tank Gauging) with the level gauge principle to one powerful system. All tank quantities as level,

volume, mass, density, etc. can be measured and calculated.

For level measurement can be used the Honeywell Enraf series 854 ATG / XTG servo gauge or the

Honeywell Enraf series SmartRadar gauge. The HIMS option is also available with the 877 FDI (Field

Display & Interface). Pressure transmitters communicating with the HART® protocol can be used.

2.1.1 HIMS calculations

The pressure transmitters P1 and P3 used with an HIMS

system are of the differential type. That means one side

(low pressure side) is open to atmosphere.

P3 is not required for tanks which are free vented to

atmosphere and with floating roof tanks.

A temperature measuring device is optional and only

required when standard volume and reference density is

to be calculated.

The pressure measured by P1 is the result of the static

liquid head above P1 (height h) and the pressure in the

vapour space, measured by P3.

The liquid height above P1 is the level (l), measured by

the level gauge, minus the distance LP.

LP represents the distance between the tank zero point

(datum plate) and the zero point of P1.

The observed density is calculated as:

Figure 2.1 Principle HIMS configuration

where:

P7 : (P1 - P3) + corr. [Pa]

P1 : pressure of pressure transmitter P1 [Pa]


corr. : for corrections, refer to section 2.1.2

LP : distance zero point tank to zero point pressure transmitter P1 [m]

LG : local gravity acceleration [m/s2]

Level : measured level from level gauge [m]

The measured level and (optionally) temperature, and the calculated observed density are transmitted to the

tank gauging system.

The tank gauging system (a Honeywell Enraf Entis Pro system, Honeywell Enraf CIUPlus or other host system)

needs the Tank Capacity Table and optionally the ASTM table to calculate the Gross Observed Volume, Mass,

and optionally the Gross Standard Volume and reference density.

HIMS


2.1.2 Corrections for ambient air and vapour density

Ambient air density correction

The pressure at the atmospheric side measured by pressure transmitter P1, compared to P3, is increased by the

column of air over the distance (LM - LP). Refer to figure 2.1.

That is compensated in the calculated pressure P7 by the term:

where:

(LM - LP) x RF x LG [Pa]

LM : distance zero point tank to zero point pressure transmitter P3 [m]

LP : distance zero point tank to zero point pressure transmitter P1 [m]

RF : ambient air density [kg/m3]


The default value for the ambient air density (item RF) is set at 1.225 kg/m3 (floating point format).

Vapour density correction

The vapour space above the product in a fixed roof tank consists of a mixture from air and product vapour.

The density of this vapour mixture in the tank is different from the density of the air outside the tank.


where:

(LM - Level) x RG x LG [Pa]

LM : distance zero point tank to zero point pressure transmitter P3 [m]

Level : measured level from level gauge [m]

RG : vapour density [kg/m3]


The default value for the vapour density (item RG) is set at 1.25 kg/m3 (floating point format).

Pressure P7

The pressure difference (P1 - P3), compensated for ambient air density and vapour density (item P7) is

calculated as:

P7 = (P1 - P3) + (LM - LP) x RF x LG - (LM - Level) x RG x LG [Pa]

Density in air

With the default values used in items RF and RG, the observed density is the density in vacuum. If the density

value is required as density in air, then item RF must be set to 0, and from item RG the value of the ambient air

density must be subtracted.

The table below summarizes the values for items RF and RG for density in vacuum and density in air.

HIMS density: in vacuum in air

ambient air density (item RF)

1.225 kg/m3 (default)

0 kg/m3

vapour density (item RG)

1.25 kg/m3 (default)

(RG - ambient air density)

HIMS


2.2 Commissioning of HIMS system

For information how to program items, refer to the instruction manual of the used level gauge or to the instruction

manual of the 847 Portable Enraf Terminal.

For connection of the pressure transmitters to the instrument, refer to the installation guide of the used level

gauge.

2.2.1 Selecting pressure and density dimension

When the pressure and/or density dimension has to be changed from default, all items with related formats have

to be changed and the values must be converted to the new dimension.

Note:

When the instrument is equipped with the XPU-2 board, then all dimension depended items will be automatically changed and the values will be automatically converted.

Item Name Description

W2= Protection level 2 Enter protection level 2

PI= Pressure dimension Selects the pressure dimension and converts the format.

This item contains one character, which can be:

P : Pa; format: sign X X X X X X separator X

K : kPa; format: sign X X X X separator X X X

I : psi; format: sign X X separator X X X X X

S : psi; format: sign X X X separator X X X X

Default set on: P [Pa]

DI= Density dimension Selects the density dimension and converts the format.


K : kg/m3; format: sign X X X X X separator X X

A : °API; format: sign X X X X separator X X X

L : lbs/ft3; format: sign X X X separator X X X X

Default set on: K [kg/m3]

. .= format depended items Not required with XPU-2 board.

Program all pressure depended and/or density depended items to

the new dimension. Refer to the table below for an overview of

these items.

EX Exit Exit protection level.

Items from which the format depends

on the pressure dimension (item PI)

Items from which the format

depends on the density

dimension (item DI)

29 M1 O2

H1 M2 O3

H2 M3 P0

H3 O1 PH

28 HD

DD

DL

DU

HIMS


2.2.2 Tank and gauge data

Figure 2.2 HIMS tank data



LM= Distance P3 - tank zero Format according to item LD. This distance is used in tank gas

correction and ambient air density correction. If pressure

transmitter P3 is not installed, use a value equal to the upper

reference point.

Alternatively, use the value of item TT (with servo level gauges),

or item PR (with SmartRadar gauges).

LN= Minimum HIMS level Format according to item LD. Default, item LN is set to 3.5

metres.

The distance LN can be lowered to approximately 2 metres.

The purpose is of LN is as follows:

If the level drops below the setting of LN, the last valid density will

be stored and used as the density value, as lower levels gives

inaccurate density results.

LP= Distance P1 - tank zero Format according to item LD. The setting of item LP directly

influences the density calculation. It therefore must be assessed

accurately. Refer to Appendix B1 for some methods to assess

this distance.

HIMS


Continue:


PA= Available pressure transmitters Three characters; 123, or a ‘ - ’ for the pressure transmitter which

is not installed. For HIMS, item PA can be:

1 - 3 : Pressure transmitters P1 and P3 are installed; or

1 - - : Pressure transmitter P1 is installed.

LG= Local gravity Standard floating point format; units: m/s2. Item LG must be set to

the local gravity constant. Appendix C gives information about the

local gravity constant.

RF= Ambient air density Standard floating point format; units: kg/m3. Default, RF is set to

+.12250000E+01. Refer to Appendix D for more information about

the ambient air density.

RG= Tank gas density Standard floating point format; units: kg/m3. Default RG is set to

+.12500000E+01. Refer to Appendix E for more information about

the vapour density.

HT= HIMS / HTG selection One character; either I (for HIMS) or T (for HTG).

Check if item HT is set to I; if not change it.

DL= Density lower limit Format according to item DI. Low density alarm set point.

Default value: +00000.00 [kg/m3].

DU= Density upper limit Format according to item DI. High density alarm set point.


HD= Density alarm hysteresis Format according to item DI. Hysteresis around the density lower

and density upper limits (items DL and DU).


M1= Minimum trip pressure P1 Format according to item PI. Sets a minimum trip pressure for

pressure transmitter P1. Default value: +000000.0 [Pa].



H1= Maximum trip pressure P1 Format according to item PI. Sets a maximum trip pressure for




PH= Pressure alarm hysteresis Format according to item PI. Hysteresis around the minimum and

maximum trip pressures (items M1, M3, H1 and H3).

Default value: +000160.0 [Pa].


HIMS


2.2.3 Set-up and configuration of the pressure transmitters

For the Set-up and Configuration of the pressure transmitters with the HART Communicator refer to Appendix G.

2.2.4 Zero calibration of the pressure transmitters

For the zero calibration procedure of the pressure transmitters, refer to Appendix H.

2.2.5 Compensation for pressure transmitter P1 position

The tank shell will bulge due to the hydrostatic pressure

caused by the liquid stored in the tank.

This can have an influence on the position of pressure

transmitter P1 (refer to figure 2.3).

The amount of movement of pressure transmitter P1

depends on the height of P1 above the bottom, the

structure of the tank shell and the density of the product.

In many cases, pressure transmitter P1 is located as low

as possible to the tank bottom and the influence of tank

shell bulging is negligible.

However, in those cases where the influence is present,

items IF and IL can be used to compensate for the

position of pressure transmitter P1.

Item IF (hydrostatic deformation factor) decreases

distance LP for (IF) mm/m level above the level IL

(hydrostatic deformation level). In formula:

Figure 2.3 Tank shell bulging

LPcomp. = LPprogr. - (Level - IL) x IF [m]

where: LPcomp.

LPprogr.

: LP compensated for hydrostatic tank deformation [m]

: the programmed value for LP [m]

Level : measured level from level gauge [m] IL : hydrostatic deformation level (item IL) [m]

IF : hydrostatic deformation factor (item IF) [mm/m]



IF= Hydrostatic deformation factor Standard floating point format; units: mm/m.

Default value: +.00000000E+00. When left at the default value,

the hydrostatic deformation compensation is disabled.

Refer to Appendix F1 for information how to obtain a correct

setting for item IF.

IL= Hydrostatic deformation level Format according to item LD. Default value: +002.0000 [m].

Item IL contains the level value above the hydrostatic deformation

compensation becomes effective. Refer to Appendix F1 how to

obtain a correct setting for item IL.


HIMS


2.3 Operation

2.3.1 Display

For operation of the display and the information on it, refer to the instruction manual of the applicable level gauge

(or 877 FDI). Below, only an overview is given which display formats give information about the pressure and

density measurement.

Display format Displayed information

E HIMS density

F Pressure P1

H Pressure P3

2.3.2 Manual inputs

For two quantities the operator can give a manual input by means of the PET (Portable Enraf Terminal), which

are not protected by protection level 1 or 2. These quantities are:


RJ= Manual tank gas density Standard floating point format; units: kg/m3. The value must be

preceded by one status character:

V : Valid manual tank gas density

I : Invalid manual tank gas density

The tank gas density is used in the same way as with item RG.

If the status of the manual tank gas density is valid (V), then the

manual tank gas density (item RJ) is used.

If the status of the manual tank gas density is invalid (I), then the

value of item RG is used as tank gas density.

P0= Manual pressure P3 Format according to item PI. The value must be preceded by one

status character:

V : Valid manual vapour pressure

I : Invalid manual vapour pressure

If there is no P3 pressure transmitter installed, and the vapour

pressure can be assumed constant, a manual vapour pressure

value can be entered.

HIMS


2.3.3 Data items

Below, a summary is given of available data items. They contain measured and calculated data, verification data

and error data.

The verification data can be used to check the results of certain steps in the measuring sequence.

The hydrostatic status indicates the validity of the measured / calculated data.

The diagnostic data provides low level error information about the pressure measurement and density

calculation.

There is only one operational command with HIMS.

Item Description

P1

P3

P4

P7

DQ

QQ

N1

N3

Q1

Q3

QF

Measured / Measured pressure of pressure transmitter P1

calculated data Measured pressure of pressure transmitter P3

P1 minus P3

(P1 - P3) compensated for ambient air density and vapour density

Calculated HIMS density (preceded by 5 status characters of item QF)

Abbreviated HIMS density (preceded by 1 status character)

Serial number of pressure transmitter P1


Temperature of pressure transmitter P1 (if available)


Hydrostatic status request (refer to section 5.6)

VV Verification data Refer to description at section 5.7

EH

FH

H0

HE

Diagnostic data Error HCU / ICU_HPI request (refer to section 5.5)

Fatal HCU / ICU_HPI errors

Last fatal HCU / ICU_HPI error

HART communication errors

Operational command:

SR Stop HART request (used with HART communicator).


HTG

3 HTG

3.1 Introduction into HTG

An HTG (Hydrostatic Tank Gauge) system measures the tank quantities by means of pressure transmitters.

Depending on the configuration, one to three pressure transmitters are required. The pressure transmitters,

communicating with the HART® protocol, are connected to an 877 FDI (Field Display & Interface).

Unlike level based tank gauges, as servo or radar, the HTG system is a direct mass measurement system.

One pressure transmitter (P1), located at a shell nozzle near the bottom, is used to measure the liquid head.

A second pressure transmitter (P2) is located approximately 2 to 2.5 metres (6 to 8 feet) above P1.

If there exists a pressure in the vapour space, the vapour pressure must be measured with a separate pressure

transmitter (P3). P3 is not required on a floating roof tank, or with a free vented cone roof tank.

3.1.1 HTG calculations

The pressure transmitters used with an HTG system are of the

differential type. That means one side (low pressure side) is

open to atmosphere.

A temperature measuring device is optional and only required

when standard volume and reference density is to be calculated.

The principle HTG formulas for level and observed density are:

Observed density is calculated as:

Level is calculated as:

where:





Figure 3.1 Principle HTG configuration

LS : distance zero point pressure transmitter P1 to P2 [m]

LP : distance zero point pressure transmitter P1 to zero point tank [m]

The calculated level and observed density and (optional) measured temperature are transmitted to the tank

gauging system. The tank gauging system (an Honeywell Enraf Entis system, Honeywell Enraf CIUPlus or other

host system) needs the Tank Capacity Table and (optionally) the ASTM table to calculate the Mass, Gross

Observed Volume, and optionally the Gross Standard Volume and reference density.

When the product density is known and does not change, pressure transmitter P2 is not required. The density

will be a manual input value, from which the level can be calculated by:

HTG


3.1.2 Volume and Mass calculations

The standard HTG mass and volume calculations are:

where: Vol.heel : Volume below the zero point of pressure transmitter P1 [m

3]

Areaeq. : Equivalent area over the (calculated) tank level [m2]

Honeywell Enraf transmits the calculated HTG level and observed density values to the tank gauging

system (Entis, CIUPlus or other host system).

In the tank gauging system the Gross Observed Volume is obtained from the level value via the tank capacity

table. Then Mass is calculated as:

Mass = Gross Observed Volume x Dens. obs.

This is equivalent to the standard HTG mass calculation as is shown in the following conversion equations:

Mass = Gross Observed Volume x Dens. obs.

Mass = (Level x Areaeq.) x Dens.obs.

Mass = (Level LP) x Areaeq. x Dens.obs. + LP x Areaeq. x Dens.obs.

substitute of HTG level and density formulas gives:

the above formula can be reduced to:

which is the standard HTG mass formula.


HTG

3.1.3 Corrections for ambient air and vapour density

Ambient air density

The pressure at the atmospheric side measured by pressure transmitter P1, compared to P2 and to P3, is

increased by the column of air over respectively the distances LS and (LM - LP). Refer to figure 2.1.

That is compensated in the calculated pressures P7 and P8 by the terms:

(LM - LP) x RF x LG [Pa] for P7 (P1 - P3)

LS x RF x LG [Pa] for P8 (P1 - P2)

where:

LM : distance zero point pressure transmitter P3 to zero point tank [m]

LP : distance zero point pressure transmitter P1 to zero point tank [m]

LS :

RF :

LG :

distance zero point pressure transmitter P1

ambient air density [kg/m3]

local gravity acceleration [m/s2]

to P2 [m]

The default value for the ambient air density (item RF) is set at: 1.225 kg/m3 (floating point format).

Vapour density correction

The vapour space above the product in a fixed roof tank consists of a mixture from air and product vapour. The

density of this vapour mixture in the tank is different from the density of the air outside the tank.


(LM - Level) x RG x LG [Pa]

where:

LM : distance zero point pressure transmitter P3 to zero point tank [m]

Level : calculated HTG level (item HQ) [m]

RG : vapour density [kg/m3]


The default value for the vapour density (item RG) is set at: 1.25 kg/m3 (floating point format).

Pressures P7 and P8

The pressure differences (P1 - P3) and (P1 - P2), compensated for ambient air density and vapour density, are:

P7 = (P1 - P3) + (LM - LP) x RF x LG - (LM - Level) x RG x LG [Pa]

P8 = (P1 - P2) + LS x RF x LG [Pa]

HTG


Density calculation

The calculated density, corrected for ambient air density (item DQ) will then become:

Level calculation

The calculated level, corrected for ambient air density and vapour density (item HQ), becomes:

Item ‘HQ’ is non-explicit. However, after conversion the level (item HQ) can directly be obtained:

Density in air

With the default values used in items RF and RG, the observed density is the density in vacuum.

If the density value is required as density in air, then item RF must be set to 0, and from item RG the value of the

ambient air density must be subtracted.

The table below summarizes the values for items RF and RG for density in vacuum and density in air.

HTG Density in vacuum in air

Ambient air density (item RF) 1.225 kg/m3 (default) 0 kg/m

3

Vapour density (item RG) 1.25 kg/m3 (default) (RG ambient air density)

HTG


3.2 Commissioning

For information how to program items, refer to the instruction manual 877 FDI or to the instruction manual of the

847 Portable Enraf Terminal. It is assumed that the basic settings for the 877 FDI are already programmed,

according to the instruction manual 877 FDI.

For connection of the pressure transmitters to the instrument, refer to the installation guide 877 FDI.

3.2.1 Selecting pressure and density dimension

When the pressure and/or density dimension has to be changed from default, all items with related formats have

to be changed and the values must be converted to the new dimension.

Note:

When the 877 FDI is equipped with the XPU-2 board, then all dimension depended items will be automatically changed and the values will be automatically converted.



PI= Pressure dimension Selects the pressure dimension and converts the format. This

item contains one character, which can be:






DI= Density dimension Selects the density dimension and converts the format. This item

contains one character, which can be:

K : kg/m3; format: sign X X X X X separator X X

A : °API; format: sign X X X X separator X X X

L : lbs/ft3; format: sign X X X separator X X X X

Default set on: K [kg/m3]


Program all pressure depended and/or density depended items

to the new dimension. Refer to the table below for an overview

of these items.


Items from which the format depends

on the pressure dimension (item PI)

Items from which the format

depends on the density

dimension (item DI)

29 M1 O2

H1 M2 O3

H2 M3 P0

H3 O1 PH

28 HD

DD

DL

DU

HTG


3.2.2 Tank and gauge data

P3

AH

P2 LM

HH HA

LS

AH P1

LN

LA

LL

LP Tank zero (datum plate)

Figure 3.2 HTG tank data



LM= Distance P3 - tank zero Format according to item LD. This distance is used in tank gas

correction and ambient air density correction. If pressure

transmitter P3 is not installed, use a value equal to the upper

reference point.

LN= Minimum HTG level Format according to item LD. Default, item LN is set to 3.5

metres.

The distance LN can be lowered to a level which is approximately

0.5 m (20") above the pressure transmitter P2.

The purpose is of LN is as follows:

If the level drops below the setting of LN, the last valid density will

be stored and used as the density value. This is, because as the

level drops below P2, density cannot be calculated anymore.

LP= Distance P1 - tank zero Format according to item LD. The setting of item LP influences

the level and hence the volume calculation. It therefore must be

assessed accurately. Refer to Appendix B2 for some methods to

assess this distance.

LS= Distance P1 - P2 Format according to item LD. The distance between pressure

transmitters P1 and P2 (item LS) is used in the level and density

calculation. It can be directly measured by means of a measuring

tape from flange to flange, or from the zero marks on both

pressure transmitters. Refer to Appendix B2 for some other

methods to assess this distance.

HTG


Continue:


PA= Available pressure transmitters Three characters; 123, or a ‘ - ’ for the pressure transmitter which

is not installed. For example, item PA can be set to:

123 : Pressure transmitters P1, P2 and P3 are installed; or

12 - : Pressure transmitters P1 and P2 are installed, etc.

LG= Local gravity Standard floating point format; units: m/s2. Item LG must be set to

the local gravity constant. Appendix C gives information about the

local gravity constant.

RF= Ambient air density Standard floating point format; units: kg/m3. Default, RF is set to

+.12250000E+01. Refer to Appendix D for more information about

the ambient air density.

RG= Tank gas density Standard floating point format; units: kg/m3. Default RG is set to

+.12500000E+01. Refer to Appendix E for more information about

the vapour density.


Item HT must be set to: T.

OB= Optional board selection Three characters; selects the optional board. Must be set to: HPU

for the optional HCU and ICU_HPI boards.

IM= Indicator mode One character; selects the indicator mode of the 877 FDI.

For HTG mode, item IM must be set to: H.

DL= Density lower limit Format according to item DI. Low density alarm set point.

Default value: +00000.00 [kg/m3]. *)

DU= Density upper limit Format according to item DI. High density alarm set point.

Default value: +00000.00 [kg/m3]. *)

HD= Density alarm hysteresis Format according to item DI. Hysteresis around the density lower

and density upper limits (items DL and DU).








*) Do enter a good estimate for the density upper limit (item DU) and density lower limit (item DL).

These values are also used in the level calculation (and checking) when the tank is filled after a complete

tank discharge whereby the level dropped below the P2 (and P1) pressure transmitter(s).

HTG


Continue:








PH= Pressure alarm hysteresis Format according to item PI. Hysteresis around the minimum and

maximum trip pressures (items M1, M2, M3, H1, H2 and H3).

Default value: +000160.0 [Pa].

LU= Level status conversion One character; default: ? The character, specified in item LU, is

used in the level status byte of the level record to the host to

indicate a ‘reduc ’ level accuracy condition. Most Honeywell

Enraf tank gauging systems accept the “?” character as

reduced accuracy status.

With the following conditions, the contents of item LU is placed in

the level status:

• manual or last valid P3 used;

• manual or last valid density used;

• manual gas density used;

• level below minimum HTG (item LN).


3.2.3 Alarm settings

Refer to figure 3.2. The high level alarm (HA) and low level alarm (LA) conditions are transmitted in the level

alarm byte of the level record to the host.



AH= Level alarm hysteresis Format according to item LD. Sets level alarm hysteresis.

Default value: +000.1000 (m).

HA= High level alarm Format according to item LD. High level alarm set point.


HH= High high level alarm Format according to item LD. High high level alarm set point.


LA= Low level alarm Format according to item LD. Low level alarm set point.


LL= Low low level alarm Format according to item LD. Low low level alarm set point.



HTG


3.2.4 Ullage readout

When an ullage reading is required, the two items shown below must

be changed.

The ullage value is also transmitted to the host via the two wire Enraf

field bus.

The ullage, or outage, measurement is referred to a zero point at the

tank top (upper reference point).

The level, or innage, measurement is referred to a zero point at the

tank bottom (datum plate).

Refer to figure 3.3.

Note:

The high and low level alarms are “innage” alarms.

Hence, a high alarm condition occurs when there is a low ullage and visa verse.

Figure 3.3 Upper reference value


W2= Protection level 2 Enter protection level 2.

UR= Upper reference Format according to item LD.

Distance UR represents the distance from the ‘i ’ zero point

(datum plate) to the upper reference point at a dip hatch (or other

point at the tank top).

DE= Level type One character; either I or U.

I : for innage measurement (default)

U : for ullage measurement.


3.2.5 Set-up and configuration of the pressure transmitters

For the Set-up and Configuration of the pressure transmitters with the HART Communicator refer to Appendix G.

HTG


3.2.6 Zero calibration of the pressure transmitters

For the zero calibration procedure of the pressure transmitters, refer to Appendix H.

3.2.7 Compensation for pressure transmitter P1 - P2 distance

The tank shell will bulge due to the hydrostatic pressure

caused by the liquid stored in the tank. This can have an

influence on the position of pressure transmitters P1 and P2

(refer to figure 3.4). The amount of movement depends on the

position of P1 and P2, the length of the ‘ar ’ (nozzle - ball

valve), the structure of the tank shell and the density of the

product. In some cases, the influence of the tank shell bulging

is negligible.

However, in those cases where the influence is present,

several methods can be followed to limited the influence.

• Mechanical solution: U-bend or rigid bar (refer to

Installation Info 003)

• Compensation for the distance P1 - P2 (item LS).

This section describes how to compensate for the distance LS.

Figure 3.4 Tank shell bulging

Item IF (hydrostatic deformation factor) increases distance LS for (IF) mm/m level above the level IL (hydrostatic

deformation level). In formula:

LScomp. = LSprogr. + (Level - IL) x IF [m]

where: LScomp.

LSprogr.

: LS compensated for hydrostatic tank deformation [m]

: the programmed value for LS [m]

Level : calculated HTG level (item HQ) [m]

IL : hydrostatic deformation level [m]

IF : hydrostatic deformation factor [mm/m]



IF= Hydrostatic deformation factor Standard floating point format; units: mm/m.

Default value: +.00000000E+00. When left at the default value,

the hydrostatic deformation compensation is disabled.


setting for item IF.

IL= Hydrostatic deformation level Format according to item LD. Default value: +002.0000 [m].

Item IL contains the level value above which the hydrostatic

deformation compensation becomes effective.


setting for item IL.

EX Exit Exit protection level

HTG


3.3 Operation

3.3.1 Display

For operation of the display and the information on it, refer to the instruction manual 877 FDI.

Below, only an overview is given which display formats give information about the level, pressure and density

measurement.

Display format Displayed information

A HTG level and temperature

B HTG level and status

E HTG density

F Pressure P1

G Pressure P2

H Pressure P3

3.3.2 Manual inputs

For three quantities the operator can give a manual input by means of the PET (Portable Enraf Terminal), which

are not protected by protection level 1 or 2. These quantities are:


RJ= Manual tank gas density Standard floating point format; units: kg/m3. The value must be

preceded by one status character:

V : Valid manual tank gas density

I : Invalid manual tank gas density

The tank gas density is used in the same way as with item RG.

If the status of the manual tank gas density is valid (V), then the

manual tank gas density (item RJ) is used.

If the status of the manual tank gas density is invalid (I), then the

value of item RG is used as tank gas density.

P0=

Manual pressure P3

Format according to item PI. The value must be preceded by one

status character:

V : Valid manual vapour pressure I : Invalid manual vapour pressure

If there is no P3 pressure transmitter installed, and the vapour

pressure can be assumed constant, a manual vapour pressure

value can be entered.

DD=

Manual density

Format according to item DI. The value must be preceded by one

status character:

V : Valid manual density I : Invalid manual density

If there is no P2 pressure transmitter installed, and the product

density can be assumed constant, a manual product density must

be given.

Note: The manual density is the observed density.

HTG


3.3.3 Data items

Below, a summary is given of available data items. They contain measured and calculated data, verification data

and error data.

The verification data can be used to check the results of certain steps in the measuring sequence.

The hydrostatic status indicates the validity of the measured / calculated data.

The diagnostic data provides low level error information about the pressure measurement and density

calculation.

There is only one operational command with HTG.

Item Description

P1

P2

P3

P4

P5

P7

P8

DQ

QQ

HQ

VQ

N1

N2

N3

Q1

Q2

Q3

QF

Measured / Measured pressure of pressure transmitter P1

calculated data Measured pressure of pressure transmitter P2

Measured pressure of pressure transmitter P3

P1 minus P3

P1 minus P2

(P1 - P3) compensated for ambient air density and vapour density

(P1 - P2) compensated for ambient air density

Calculated HTG density (preceded by 5 status characters from item QF)

Abbreviated HTG density (preceded by 1 status character)

Calculated HTG level (preceded by 5 status characters from item QF)

Calculated HTG ullage (preceded by 5 status characters from item QF)








VV Verification data Refer to description at section 5.7

EH

FH

H0

HE






SR Stop HART request (used with HART communicator).

Vapour pressure (P3) measurement


4 Vapour pressure (P3) measurement

4.1 Introduction into vapour pressure measurement

The vapour pressure measured on spheres, spheroids, bullets, etc. is used in the calculation of the Total Gross

Standard Volume. That is the volume which includes the amount of evaporated product in the vapour space.

The vapour pressure measurement can be integrated in the Enraf level gauge.

The following level gauges can be equipped with an option board to measure the vapour pressure:

• 854 ATG servo gauge

• SmartRadar with high pressure antenna

Alternatively, the vapour pressure measurement can be connected to an 877 FDI (Field Display & interface) with

an appropriate option board.

Pressure transmitters communicating with the HART® protocol can be connected to the Enraf gauges with the

optional HCU or ICU_HPI board.

The measured pressure by the roof pressure transmitter (P3) is transmitted to the tank gauging system.

The tank gauging system (an Enraf Entis system, Enraf CIUPlus or other host system) performs the corrections

on the Gross Standard Volume and Mass for the amount of product in the vapour space.



4.2 Commissioning

For information how to program items, refer to the instruction manual of the used level gauge or to the instruction

manual of the 847 PET (Portable Enraf Terminal).

For connection of the pressure transmitter to the instrument, refer to the installation guide of the used level

gauge.

4.2.1 Selecting pressure dimension

When the pressure dimension has to be changed from default, all items with a pressure format have to be

changed and the value must be converted to the new dimension.

Note:

When the instrument is equipped with the XPU-2 board, then all dimension depended items will be automatically changed and the values will be automatically converted.



PI= Pressure dimension Selects the pressure dimension and converts the format.








Program all pressure depended items to the new dimension.

Refer to the table below for an overview of these items.

EX Exit Exit protection level 2

Items from which the format depends on the pressure dimension (item PI)

29 H1 H2 H3

M1 M2 M3 O1

O2 O3 P0 PH



4.2.2 Gauge data



PA= Available pressure transmitters Three characters; 123, or a ‘ - ’ for the pressure transmitter(s)

which is (are) not installed. For vapour pressure measurement,

item PA must be set to:

- - 3 : pressure transmitter P3 is installed


Check if item HT is set to I; if not change it.

M3=

Minimum trip pressure P3

Format according to item PI. Sets a minimum trip pressure for


H3=

Maximum trip pressure P3

Format according to item PI. Sets a maximum trip pressure for


PH=

Pressure alarm hysteresis

Format according to item PI. Hysteresis around the minimum and

maximum trip pressure (items M3 and H3).

Default value: +000160.0 [Pa]

EX

Exit

Exit protection level.

4.2.3 Set-up and configuration of the pressure transmitter

For the Set-up and Configuration of the pressure transmitter with the HART Communicator refer to Appendix G.

4.2.4 Zero calibration of the pressure transmitter

For the zero calibration procedure of the pressure transmitter, refer to Appendix H.



4.3 Operation

4.3.1 Display

For operation of the display and the information on it, refer to the instruction manual of the applicable instrument.

The vapour pressure can be observed when Display format H is selected.

4.3.2 Manual input

If pressure transmitter P3 is temporary out of operation, a manual vapour pressure value can be given to the

instrument by means of the PET (Portable Enraf Terminal). The manual input is not protected by a password.


P0= Manual pressure P3 Format according to item PI. The value must be preceded by one

status character:

V : Valid manual vapour pressure

I : Invalid manual vapour pressure

If the P3 pressure transmitter is temporary out of order, a manual

vapour pressure value can be entered.

4.3.3 Data items

Below, a summary is given of available data items. There is only one operational command.

Item Description

P3

N3

Q3

QF

Measured data Measured pressure of pressure transmitter P3




VV

Verification data Refer to description at section 5.7

EH

FH

H0

HE






SR Stop HART request (used with HART Communicator).


Maintenance and Troubleshooting

5 Maintenance and troubleshooting

5.1 Maintenance

For preventive maintenance on the pressure transmitters, refer to the maintenance instructions of the used

pressure transmitters.

It is recommended to check the zero calibration of the pressure transmitters once per year. Refer to Appendix H.

5.2 Troubleshooting HIMS

This section is intended as a help in finding the cause with start-up problems and when no correct reading of the

pressure or density is obtained.

1) No or incorrect level reading.

Please refer to the section maintenance / trouble shooting of the instruction manual from the used level

gauge (servo or radar). An incorrect level reading results in a wrong volume reading and wrong density

reading, but mass remains unaffected.

2) No pressure value with items P1 and P3.

• Check item PA (available pressure transmitters);

• Request for items EH and QF. Decode the displayed error codes as given in sections 5.5 and 5.6.

Find from the decoded message the cause of the problem;

• Check the wiring from the pressure transmitters to the instrument terminals (mind the polarity!);

• Check if the pressure transmitters are correctly configured (refer to Appendix G);

• Check the voltage on the instrument terminals for the pressure transmitter:

HART input 2 (recommended) HART input 1

Unloaded

18.7 Vdc

18.7 Vdc

1 transmitter

16.4 Vdc

15.9 Vdc

2 transmitters

15.6 Vdc

14.5 Vdc

The current on the HART communication line is obvious:

- with 1 transmitter: 4 mA

- with 2 transmitters: 8 mA

3) The HIMS observed density does not correspond with the real density from the product.

• If the difference is 0.18%, then it can be explained from the method of pressure transmitter calibration.

Some pressure transmitters are calibrated with water column at 20 °C, while water has a density of 1000

kg/m3 at 4 °C. If this is the case, then correct item LG (local gravity) with 0.18%;

• Check zero calibration of pressure transmitters (refer to Appendix H);

• If there exists a density difference at mainly lower levels (thus not at higher levels), then the cause must

be found in a wrong value for item LP. Check on distance LP. Eventually check the level gauge on its

correct reading;

• If there is more or less a constant density difference, check on settings of items:

LG, LM, RF, RG (or RJ).



5.3 Troubleshooting HTG

This section is intended as a help in finding the cause with start-up problems and when no correct reading of the

mass, density, level, pressure or volume is obtained.

1) 877 FDI does not start-up correctly; no level / density indication.

• Please refer to the section service / trouble shooting of the instruction manual 877 FDI.

• Check items: IM, HT, OB and PA.

2) No pressure value with items P1, P2 and P3.

• Check item PA (available pressure transmitters);

• Request for items EH and QF. Decode the displayed error codes as given in sections 5.5 and 5.6.

Find from the decoded message the cause of the problem;

• Check the wiring from the pressure transmitters to the instrument terminals (mind the polarity!);

• Check if the pressure transmitters are correctly configured (refer to Appendix G);

• Check the voltage on the instrument terminals for the pressure transmitter:

HART input 2 (recommended) HART input 1

Unloaded

18.7 Vdc

18.7 Vdc

1 transmitter

16.4 Vdc

15.9 Vdc

2 transmitters

15.6 Vdc

14.5 Vdc

3 transmitters

14.5 Vdc

13.4 Vdc

The current on the HART communication line is obvious:

- with 1 transmitter: 4 mA



3) The HTG mass value does not correspond with the real mass in the tank.

• If the deviation is more or less a constant offset value, and the level and observed density calculations are

correct, and the volume shows also an offset value, then the problem must be found in the strapping

tables (incorrect data).

• If the deviation is more or less a constant offset value, and the calculated level and volume shows a

similar offset, while the calculated observed density is correct, then item LP (distance P1 - tank zero)

should be adjusted.

• If the deviation is not a constant offset value, check pressure transmitters P1 and P3 (zero calibration).

4) The HTG calculated observed density does not correspond with the real density from the product.

• If the difference is 0.18%, then it can be explained from the method of pressure transmitter calibration.

Some pressure transmitters are calibrated with water column at 20 °C, while water has a density of 1000

kg/m3 at 4 °C. If this is the case, then correct item LG (local gravity) with 0.18%;

5) The HTG calculated observed density and calculated level (and hence, volume) are deviating from the real

value.

• There is a situation in where the HTG system (which is a direct mass measurement system), cannot give

an accurate density, level and volume reading. That is the case when the product is stratified in density.

Even when the product was homogeneous when it was loaded into the tank, it can become stratified as

the heavier parts in the product are settling down. The HTG system then measures a too high density, and

hence level and volume are calculated too low. Mass however, is unaffected by stratification.

• Check zero calibration of pressure transmitters (refer to Appendix H).



bit 0 : P1 exceeds min. or max. trip pressure

1 : P2 exceeds min. or max. trip pressure

2 : P3 exceeds min. or max. trip pressure *)

3 : exceeding range P1

4 : exceeding range P2

5 : exceeding range P3 *)

6 : 1

7 : 0

5.4 Troubleshooting vapour pressure (P3) measurement

No pressure value with item P3

Refer to step 2 at section 5.3.

5.5 Hydrostatic error request (item EH)

This item contains the most recent pressure transmitter error encountered by the optional HCU / ICU_HPI board.

xx00 No error xx11 Pressure transmitter P1; no reply on initial HART Pressure transmitter P1 in fail or not connected; check with HART

commands communicator. Or when P1 is not installed: set first character of

item PA to ‘-’ (e.g. - - 3).

xx12 Pressure transmitter P2; no reply on initial HART Pressure transmitter P2 in fail or not connected; check with HART

commands communicator. Or when P2 is not installed: set second character of

item PA to ‘-’ (e.g. 1 - 3).

xx13 Pressure transmitter P3; no reply on initial HART Pressure transmitter P3 in fail or not connected; check with HART

commands communicator. Or when P3 not installed: set third character of

item PA to ‘-’ (e.g. 1 - -).

xx35 Pressure transmitter P1; wrong PV dimension Primary Variable of pressure transmitter P1 must be set to: ‘kP ’.



xx99 HART input option print not mounted Change HCU or ICU_HPI board for correct type.

xx: 24 for HPU emulation

28 for HSU emulation

30 for HCU emulation

5.6 Hydrostatic status request (item QF)

The hydrostatic status request item contains five status bytes (Byte 0, Byte 1, Byte 2, Byte 3 and Byte 4) from

the optional HCU / ICU_HPI board. For decoding, refer to the ASCII table in appendix A.

Status byte 0: Status byte 1:

bit 0 : general HCU / ICU_HPI fail *)

1 : low level alarm 1)

2 : low low level alarm 1)

3 : high level alarm 1)

4 : high high level alarm 1)

5 : level time-out 2)

6 : 1

7 : 0

Status byte 2: Status byte 3:

bit 0 : fail P1 bit 0 : last valid density used

1 : fail P2 1 : manual density used

2 : fail P3 *) 2 : high density alarm

3 : manual P3 used *) 3 : low density alarm

4 : last valid P3 used *) 4 : HTG level fail 1)

5 : manual level used 2) 5 : no previous store command *)

6 : 1 6 : 1

7 : 0 7 : 0

Status byte 4:

bit 0 : manual gas density used Note: 1 : level below LN Only the bits which are set to ‘1’ have an active status.

2 : last valid level used 2)

3 : invalid level reading 2)

4 : °API underflow/overflow or negative density

5 : 0

6 : 1

1) With HTG only; ignore these bits for HIMS. 2) With HIMS only; ignore these bits for HTG.

7 : 0 *) Use only these bits with vapour pressure measurement.



5.7 HART device pointer (items VP and VV)

By means of the value pointer (item VP) a vector can be loaded to the HCU or ICU_HPI option board. Next, with

item VV, the selected data is returned. Item VP consists of 4 positions, in the middle separated by a ‘.’ or ‘,’ :

v w . x y (or v w , x y). The values for the value pointer are listed in the table together with the obtained data.

v w , x y Selected data Example / Dimension

0 0

0 0

0 0

0 0

0 3

0 3

0 3

,

,

,

,

,

,

,

0 0

0 1

0 2

0 3

0 0

0 1

0 9

HCU / ICU_HPI Emulation & Function

Emulation: HSU, HPU, HCU

Function: HC: HART channel installed

AO: analog output

ST: spot temperature

MT: VITO average temperature

WS: external water bottom probe

WT: VITO water bottom probe

PR: pressure transmitters

Configuration boot code

Sales code option: J boot code: 2E

U 25

Y 3F

HCU / ICU_HPI hardware version

Boot code software version

Error counters HART addresses 0, 1, 2 (for P1: counter 1,

for P2: counter 2)

Error counters HART addresses 3, 4, 5 (for P3: counter 0)

Detected HART device addresses (1 for P1; 2 for P2;

3 for P3)

VV=HCU HCAOMT- - PR

VV=HCU CONFIG: 3F

VV=HW VERSION: 00

VV=BOOTSW VERS:01

VV=0000:0000:0013

VV=0000:0000:0000

VV=1 - 3 - 5 - - - - - - - - -

Item

VP=

Name

HART device value pointer

Description

HART device value pointer; format: 2 digits, separator, 2 digits

(refer to table above).

Example: VP=03.09: value pointer loaded to request the

detected HART devices

VV

HART device pointer value

HART device pointer value.

This item holds the value requested by item VP (refer to table

above).

Example: the requested detected HART devices


Appendix

Appendix A ASCII table

Appendix


Appendix B1 Assessment of distance LP for HIMS

In this Appendix three methods are described to obtain the distance: zero point tank - zero point pressure transmitter P1 (item LP).

B1.1 LP determination from measurement

The principle of this method consist of five measurements (refer to figure below). When performed well, the distance LP can be determined

within ±2 mm.

Step 1) Level This is the level reading of the level gauge. Make sure it is indicating the correct value (level).

Step 2) Ullage

Perform a manual ullage measurement from a dip hatch located closed to the pressure transmitter P1 (ullage).

Step 3) Roof distance

This is the distance from the selected dip hatch to a horizontal flat place on the tank railing above pressure transmitter P1

(roof distance).

We advise to measure this distance with a theodolite (optical measuring device), to bring over the horizontal distance from

the leveled rod on the dip hatch to the levelled rod next to the tank railing.

Step 4) TX distance

Measure the distance from the horizontal flat place on the tank railing to the top of the pressure transmitter flange

(TX height).

Use a measuring tape and perform this measurement at a time there is no (hard) wind.

Step 5) TX centre

With most pressure transmitters, the centre of the measuring diaphragm is also at the centre of the mounting flange

(TX centre).

For example: a 2", 150 lbs flange has a centre distance of 76.2 mm.

Calculate LP: LP = level + ullage + roof distance - TX height - TX centre

Level

gauge

Roof distance (3)

H1

H2

Ullage (2)

Level (1) TX-height (4)

Roof distance

TX-centre (5) Roof distance = H1 - H2

LP

Tank zero

LP determination by measurement


Appendix

15.755 114000.5

14.582 105134.4

13.290 95421.8

11.563 82402.5

10.051 70963.2

8.491 59198.0

7.327 50480.1

5.272 34968.4

4.783 31250.6

3.149 18932.9

2.385 13192.7

1.234 4515.3

Pre

ssu

re P

7

[kP

a]

B1.2 LP derived by calculation from density sample

This method is fast and easy, provided that the tank is filled for not more than half of its capacity and the product is homogeneous.

LP can be found from the following formula:

where:

Level : measured level from the level gauge [m]

P7 :

LG :

request for item P7 by means of the Portable Enraf Terminal

request for item LG by means of the Portable Enraf Terminal

[Pa]

[m/s2]

Dens.obs. : this is the value from a manual density sample. [kg/m3]

Note: If the density value is provided by the lab, make sure it is re-calculated to the observed density value at the actual product temperature.

B1.3 LP determined by linear regression

With this method a number of readings are taken over the full measuring range. The readings taken are: Level and P7.

Note:

This method can only be followed when the product is homogeneous. Hence for products with density stratification, this method cannot be used.

The measurements can only be taken with the same product. In practice this means, one start with a full tank and take the readings after a

batch is dispatched. A set of at least 8 to 10 measurement over the measuring range should be taken to get a good result. It can take several

days before the measurements are completed.

Request the Level from the level gauge and request for P7 by means of the Portable Enraf Terminal (item P7).

At the end of the test run, all gathered data can be processed in a spread sheet program to calculate the pressure regression line.

Where the regression line of the pressure value crosses the zero line of the pressure-axis, the corresponding level value on the level-axis

represents the distance LP.

As an example, the following Level and P7 values are

taken, and the figure shows the regression line.

Level P7

[m] [Pa]

120

110

100

90

80

70

60

50

40

30

20

10

0

Distance LP can be calculated from the regression data:

-10

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Level [m]

measured data Linear regression method

regression line

Appendix


Appendix B2 Assessment of distance LP (and LS) for HTG

In this Appendix three methods are described to obtain the distance: zero point tank - zero point pressure transmitter P1 (item LP).

B2.1 LP determination from measurement

The principle of this method consist of five measurements (refer to figure below). When performed well, the distance LP can be determined

within ±2 mm.

Step 1) Level The level can be taken from an innage dip at the datum plate, or from a manual ullage measurement at the upper reference

point. Take the level reading (level).

Step 2) Ullage

Perform a manual ullage measurement from a dip hatch located closed to the pressure transmitter P1 (ullage).

Step 3) Roof distance

This is the distance from the selected dip hatch to a horizontal flat place on the tank railing above pressure transmitter

P1(roof distance).

We advise to measure this distance with a theodolite (optical measuring device), to bring over the horizontal distance from

the leveled rod on the dip hatch to the leveled rod next to the tank railing.

Step 4) TX distance

Measure the distance from the horizontal flat place on the tank railing to the top of the pressure transmitter flange

(TX height).

Use a measuring tape and perform this measurement at a time there is no (hard) wind.

Step 5) TX centre

With most pressure transmitters, the centre of the measuring diaphragm is also at the centre of the mounting flange

(TX centre).

For example: a 2", 150 lbs flange has a centre distance of 76.2 mm.

Calculate LP: LP = level + ullage + roof distance - TX height - TX centre

Roof distance (3)

H1

H2

Ullage (2)

Level (1)

TX-height (4)

Roof

distance

TX-centre (5) Roof distance = H1 - H2

LP

Tank zero

LP determination by measurement

Appendix


B2.2 LP derived from mass calculation

As the HTG system is a direct mass measuring system, it is obvious to calibrate the HTG system by means of a mass comparison method.

First of all, a good guess is made for the distance LP. In the worst case, LP can be left at zero.

The mass of the product in the tank, measured by the HTG system, will be compared with the mass, measured and calculated in the

traditional way or by means of another mass measuring system (such as mass-flow meters).

Note:

Before applying this method the density measurement (and thus distance LS) must be correct, as the density is used in the heel mass.

The traditional way is:

• manual dip (or ullage dip from URP, then convert to innage)

• find volume in tank capacity table

• measure the temperature from the product

• perform a density sample

• calculate the reference density

• calculate the standard volume

• calculate mass as standard volume times reference density

The outcome from this mass calculation (or from another mass measuring device) is then compared to the mass reading of the HTG system.

Find distance LP with a trial and error method.

B2.3 LP (and LS) determined by linear regression

With this method a number of level readings are taken over the full measuring range. The level reading from the HTG system and the level

reading from a manual measurement are compared.

Note:

Although the HTG system is a direct mass measurement system, the calibration described below is based on level measurement. The

level measurement from an HTG system is not that accurate that it can be used in a calibration method for a mass measurement system.

The reason that this method is described, is that it is a relative simple method. In general we do not recommend this method.

Note:

This method can only be followed when the product is homogeneous. Hence for products with density stratification, this method cannot be used.

Recall the basic HTG level formula:

An error in the distance LS will cause a gain error in the HTG level reading, and

an error in the distance LP will cause an offset error in the HTG level reading.

Take a good guess for the values of items LP and LS.

The measurements can only be taken with the same product. In practice this means, one start with a full tank and take the readings after a

batch is dispatched. A set of at least 8 to 10 measurement over the measuring range should be taken to get a good result. It can take several

days before the measurements are completed. At the end of the test run, all gathered data can be processed in a spread sheet program.

As an example, the following level data is taken:

(LP=+000.7500 m and LS=+002.1000 m)

Manual

level

[m]

HTG

level

[m]

Delta

level

[mm]

Regression data from

level difference

(against manual level)

From the level difference (defined as: Manual level - HTG

level), a regression line is calculated. From this regression

line data, correction factors can be obtained for the

distances LP and LS.

17.238 16.7998 438.2 Constant: 0.014946 m 15.755 15.4041 350.9 Slope: 0.024347 m/m The first approximation for the correction factor for LP is:

14.582 14.2574 324.6 LPcorr. = Constant + Slope x LP 13.290 12.9826 307.4 11.563 11.3063 256.7 A second (and perhaps third) recalculation may be required

10.051 9.8184 232.6 to find the proper correction factor for LP:

8.491 8.3102 180.8 LPcorr.’ = Constant + Slope x (LP + LPcorr.) 7.327 7.1500 177.0 5.272 5.1616 110.4 The recalculation can be terminated when the difference

4.783 4.6730 110.0 between the last correction factor and the one before the

last one is ≤0.0015 m. Distance LP then becomes:

LP = LP + LPcorr’

Appendix


correction on LP correction on LS

LPcorr.

LPcorr.’

∆ LPcorr.

0.003314

0.003395

0.000081

LScorr.

LScorr.’

∆ LScorr.

0.051128

0.052373

0.001245

LP

0.7534

LS

2.1524

The first approximation for the correction factor for LS is:

LScorr. = Slope x LS

A second (and perhaps third) recalculation may be required:

LScorr.’ = Slope x (LS + LScorr.)

The recalculation can be terminated when the difference

between the last correction factor and the one before the

last one is ≤0.0015 m. Distance LS then becomes:

LS = LS + LScorr.’

The table at the right upper corner shows the calculation

results for the example and the figure shows (a part) of

the regression line with the relevant data used in this

calculation example.

B2.4 LS derived from calculation of density sample

The distance LS can be calculated from a known density (taken by a sample) and the pressure value P8. The HTG density formula can be

re-arranged to calculate the distance LS:

All data are measured when the level in the tank is not moving and mixers are shut off. To perform density sampling, a dip hatch must be

opened, and time should be given to vent eventually over pressure and to stabilize the pressure readings.

P8 : The pressure P8 is read by means of the PET (Portable Enraf Terminal). Take more than one reading with a sufficient time

interval (for instance: 5 readings with an interval of one minute each). Average the readings.

LG : The value of item LG can also be requested by the PET or copied from the Set-up/Maintenance form or log-file of the 877

FDI.

Dens.obs. : This is the value from the manual density sample which must be taken.

The best place to take the density sample is as close as possible to the place where the pressure transmitters P1 and P2 are

installed. The samples can only be taken over the height between pressure transmitters P1 and P2. Make sure the density

sample is an average density sample over this height.

Since the density required is an observed density value, the product temperature must be measured as well.

If from Lab analyses a reference density is provided, recalculate it to the observed density value.

Note:

Mind to take the same type of density in the HTG and sample: density in air or density in vacuum.

Appendix


gra

vity a

ccele

ration [

m/s

2 ]

Appendix C Local gravity constant (item LG)

The gravitational acceleration constant is not the same all over the world and depends on the latitude and height above sea level.

The table and graph below gives anapproximate gravity acceleration for several ellipsoidal latitudes at sea level.

Latitude [°] g [m/s2] Latitude [°] g [m/s2] Latitude [°] g [m/s2]

0

9.780490

30

9.793378

60

9.819239

5

9.780881

35

9.797455

65

9.822941

10

9.782043

40

9.801805

70

9.826139

15

9.783940

45

9.806294

75

9.828734

20

9.786517

50

9.810786

80

9.830647

25

9.789694

55

9.815146

85

9.831819

The following term must be added to the gravity figure from the table and graph for correction above sea level:

- 0.003086 [m/s2 /km]

9.84

9.83

9.82

9.81

9.80

9.79

9.78

9.77

9.8128

52.2

0 10 20 30 40 50 60 70 80 90

Latitude [°]

Gravity acceleration graph (for sea level)

Appendix


am

bie

nt

air

de

ns

ity (

RF

) [k

g/m

3 ]

Appendix D Ambient air density (item RF)

The barometric pressure decreases with the height above sea level. If for the average barometric pressure at sea level is taken 1013 mbar,

then the barometric pressure at different heights is given as:

Height above sea [m] Barometric pressure [m]

0

1013

500

955

1000

899

1500

846

The graph below gives the air density at different temperatures and different heights above sea level according to the barometric pressure

given in the table above.

Select for item RF a value, according to the height above sea and the average ambient temperature throughout the year.

For example: Netherlands; a country at sea level height; average barometric pressure: 1013 mbar; average day-time temperature: 15 °C.

Then, for the ambient air density, a value of 1.218 kg/m3 is found.

Air density at different heights

with 80% humidity (@1013 mbar)

1.5

1.4

1.3

1.218

1.2

0 m

500 m

1000 m

1500 m

1.1

1.0

0.9

0.8

-20 -10 0 10 15 20 30 40 50

average ambient temperature [°C]

Ambient air density

Density in air

With the true value of the ambient air density used in item RF, the product density is calculated as density in vacuum.

If the product density is required as density in air, then item RF must be set to 0. Refer also to appendix E.

Appendix


Appendix E Vapour density (items RG and RJ)

The area above the liquid in a fixed roof tank contains a mixture of air and product vapour. The amount of evaporated product depends on

the vapour pressure of the liquid, which is a function of the temperature. The higher the temperature, the more product evaporates.

The density of the gas mix above the product can be calculated with the formula of the gas density, using the vapour pressure as a relation

between the amount of evaporated product and air. The formula is:

i

i i

where:

Dens.gas mix

: tank gas density used in items RG and RJ [kg/m3]

T : product temperature [°C]

Pvap.

Mliq.

Pamb.

Mair

: vapour pressure of the liquid [mbar]

: molecular weight of the liquid [g]

: vapour space pressure in the tank [mbar]

: molecular weight of air (28.964) [g]

For atmospheric tanks, Pamb. is the average barometric pressure. If there is some over pressure, then Pamb. must reflect this over pressure

value.

In general, lighter products evaporate more (have a higher vapour pressure) than heavier products.

As an example, the tank gas density of two different products is given in the table below.

The products are: Methanol (Mliq. = 32.04 g) and Isopropyl benzene (Mliq. = 120.2 g).

Methanol Isopropyl benzene

Temperature [°C]

Pvapour [mbar]

RG / RJ [kg/m3]

Temperature [°C]

Pvapour [mbar]

RG / RJ [kg/m3]

0

40

1.297

0

1.1

1.296

5

54

1.276

5

1.6

1.275

10

72

1.256

10

2.3

1.255

15

95

1.237

15

3.2

1.237

20

125

1.220

20

4.4

1.220

25

163

1.204

25

6.1

1.206

30

211

1.190

30

8.3

1.194

35

270

1.178

35

11.1

1.185

40

342

1.167

40

14.7

1.178

Both products appear to have nearly the same tank gas density due to the mechanism that heavier products evaporates less than lighter

products.

In case of a floating roof tank, or a tank with an inner floating roof, the tank gas density can be set equal to the ambient air density.

Density in air

With the true value of the tank gas density used in item RG (or RJ), the product density is calculated as density in vacuum.

If the product density is required as density in air, then the value of the ambient air density must be subtracted form the found value for the

tank gas density in item RG (or RJ). Refer also to appendix D.

Appendix


Mo

ve

me

nt

P1

[mm

]

Appendix F1 Define values for hydrostatic deformation (items IF and IL) for HIMS

If the installation of pressure transmitter P1 is such that movement due to tank shell bulging occurs, then items IF and IL can be programmed

to compensate for that movement. But first, the amount of movement must be known.

This Appendix describes a method of measuring the movement of pressure transmitter P1 and calculates from the measuring results the

hydrostatic deformation factor (item IF) and hydrostatic deformation level (item IL).

649

Tank shell 648

Ruler

647

646

Nozzle

Ball valve Pressure

transmitter P1

Tank bottom

Mark on P1

Heavy metal block

645

644

643

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

Level [m]

measured data best fit line

Measure and calculate the hydrostatic deformation compensation items IF and IL

On pressure transmitter P1 should be a mark for the zero line of the pressure transmitter. If there is not such a mark, just make one.

A (temporary) fixed and stable horizontal area should be made available as a reference point for the height measurements. For instance, a

heavy block of metal, made horizontal by sand or wood pieces.

The height measurements could be made with a dip tape, or by a ruler. Use with all measurements one and the same instrument.

Note with each measurement the height to the mark on P1 and the liquid level in the tank. At least a set of 8 to 10 measurements over the full

measuring range of the tank should be taken for a good result.

Level

[m]

Ruler reading

[mm]

As an example, some data is given in the table at the left, from which the calculations are made

to determine the values for items IF and IL.

15.755

14.582

13.290

11.563

10.051

8.491

7.327

5.272

4.783

3.149

2.385

1.234

644

644

645

646

646

647

647

647

648

648

648

648

In this example, for the first 5 metres level, distance LP does not change. Then, when there is

more product in the tank, distance LP starts to decrease.

From the point where LP decreases, a best fit line (regression line) is drawn through the

measuring points. The slope of this line (0.332 mm/m) is the figure to be used in item IF.

The point where this line crosses the line of measured point where LP did not changed yet is

used as the value in item IL (4.021 m).

Appendix


Level

[m]

Distance LS

[m]

17.238 2.156

15.755 2.155

14.582 2.154

13.290 2.154

11.563 2.153

10.051 2.152

8.491 2.152

7.327 2.151

5.272 2.150

4.783 2.150

2.385 2.150

1.234 2.150

Dis

tance

LS

[m

]

Appendix F2 Define values for hydrostatic deformation (items IF and IL) for HTG

If the installation of pressure transmitters P1 and P2 is such that movement due to tank shell bulging occurs, then items IF and IL can be

programmed to compensate for that movement. But first, the amount of movement must be known.

The movement of pressure transmitters P1 and P2 can simply be measured by a (calibrated) measuring tape (or ruler) at several product

levels. Use with all measurements the same instrument.

The distance to be measured is the distance between the zero lines on the pressure transmitters P1 and P2 (if present). When such a zero

line is not present, the distance between any other fixed point on the pressure transmitter will do. Even a mark on the flanges of P1 and P2.

Note also the product level with each measurement of distance LS.

For a good result at least a set of 8 to 10 measurements over the measuring range of the tank should be taken. Then from the measuring

results the hydrostatic deformation factor (item IF) and hydrostatic deformation level (item IL) can be calculated.

As an example some data is given from which the calculations are made to determine the values for IF and IL:

2.157

2.156

2.155

2.154

2.153

2.152

2.151

2.150

0.469 mm/m

For the first 5 metres in the above example, LS does not

change. Then, when there is more product in the tank,

LS starts to increase.

2.149 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

IL HTG Level [m]

measured data best fit line

Distance LS compensation

From the point where LS increases, a best fit line (regression line) is drawn through the measuring points.

The slope of this line (0.469 mm/m) is the figure to be used in item IF.

The point where this line crosses the line of measuring points where LS did not change yet, is used as the value for item IL (5.104 m).

Appendix


Appendix G SET-up and Configuration procedure for HART®

pressure transmitters

with the HART Communicator model 275

Set- up The set-up procedure is meant to prepare the pressure transmitter for multi-drop mode operation as required for

use with Enraf gauges, equipped with the HCU or ICU_HPI option board.

If during this procedure any error message appears, or when the operation deviates from the description, please

refer to the Instruction manual supplied with the pressure transmitter.

If more than one pressure transmitter is connected to the Enraf gauge, disconnect temporary the other(s) and

set-up one transmitter at the time.

1 Enter protection level 2 of the instrument.

Note: If the 847 PET is being used, it is advised to disable the keyboard time-out function of the PET.

2 Issue the ‘ top HART reques ’ command (item SR). This command will abort the HART communication

scheduler.

Note: This is necessary since the optional HART board doesn’t allow a second master on the HART line.

3 Switch on the HART communicator. Wait for the self-test message that no device is found. Then press OK

<F4>.

4 Connect the HART communicator to the HART communication line (to the pressure transmitter).

5 The HART communicator shows the following message on the display:

Select “ nli ” by pressing the “” key and the “” key.

6 The following menu will be shown:

Select “Device s ” by pressing the “” key.

7 If the transmitters DDL is installed in the HART Communicator, all settings

can be given. If it isn’t installed, only a few of the settings can be given.

For configuration with Enraf gauging, the set-up for multi-drop mode can

be made, as well as the selection for Engineering units and damping. But

not the zero calibration.

HART Communicator

1Offline

2 Online

3 Frequency Device

4 Utility

Generic:

Online (Generic)

1Device setup

2 PV

3 PV AO

4 PV LRV

5 PV URV

In the following instructions the selections between brackets () are for the situation the DDL is not installed.

Select 4 Detailed setup

Select 3 Output condition

Select 4 (2) HART output

Select 1 Poll address

Press the “” key. Default the polling address is at 0 (analog mode).

For multi-drop mode the address must be different from 0. The lowest

mounted pressure transmitter is always called P1, and the software on

the HCU and ICU_HPI board assumes its address will be “1”. This applies

for both HTG and HIMS. The address for P2 (middle transmitter - only

with HTG) and P3 (roof transmitter for HTG, HIMS and vapour pressure

measurement) should be set to “ ” and “ ” likewise.

Appendix


Give the desired address (1, 2 or 3) by means of the numerical key path

on the HART communicator.

Then press ENTER <F4>.

8 Press SEND <F2>, to store the new address in the transmitter’s memory.

9 Press OK <F4> (twice).

10 Press HOME <F3>.

The transmitter is now set in multi-drop mode. This concludes the set-up procedure, however certain

parameters still needs to be set. That is described in the configuration section.

10a

10b

If the configuration will be done in a later stage, then:

• switch off the HART communicator

• disconnect the probes from the HART communication lines

• give EX command on the 847 PET, which then re-starts the instrument and the HART

communication.

If the configuration is done directly after the set-up, then continue at point 6) of the configuration

section.

Configuration The configuration procedure describes how to program on-line certain parameters of the pressure transmitter

necessary for operation with the Enraf HCU or ICU_HPI board. It is assumed that the pressure transmitter is

already in multi-drop mode (refer to set-up procedure).

If during this procedure any error message appears, or when the operation deviates from the description, please

refer to the Instruction manual supplied with the pressure transmitter.

1 Enter protection level 2 of the instrument.

Note: If the 847 PET is being used, it is advised to disable the keyboard time-out function of the PET.

2 Issue the ‘ top HART reques ’ command (item SR). This command will abort the HART communication

scheduler.

Note: This is necessary since the optional HART board doesn’t allow a second master on the HART line.

3 Switch on the HART communicator. Wait for the self-test message that no device is found. Then press OK

<F4>.

4 Connect the HART communicator to the HART communication line (to the pressure transmitter)

5 The HART communicator shows the following message on the display:

Select “ nli ” by pressing the “” key and the “” key.

6 After the scanning is completed, the following message will be shown:

Note: If more HART® devices are connected, their addresses are shown too.

Select the required transmitter by pressing the “” key and then the

“” key.

HART Communicator

1Offline

2 Online

3 Frequency Device

4 Utility

HART Communicator

Online

11

2

3

Appendix


7 The following two messages are

displayed intermittently.

Answer always with NEXT <F3> and

YES <F1>.

Generic:

Analog output 1 and its

digital representative are

in fixed mode, and not

responsive to input changes

NEXT

Generic:

Ignore next 50

occurrences of

status

YES NO

8 The following menu will be shown:


9 If the transmitters DDL is installed in the HART Communicator, all settings

can be given. If it isn’t installed, only a few of the settings can be given.

For configuration with Enraf gauging, the selection for Engineering units

and damping. But not the zero calibration.

In the following instructions the selections between brackets () are for the situation the DDL is not installed.

Setting Engineering units to kPa:

Select 3 Basic setup

Select 2 PV unit

Scroll with the “” key till the units “ P ” appear, then press ENTER <F4>.

10 Press SEND <F2>.


12 Press HOME <F3>.

The units are now set to kPa, which is required for communication with the Enraf HCU or ICU_HPI option

board.

Setting the damping:

13 From this menu:


14 Select 4 Detailed setup

Select 2 Signal condition

Select 5 (1) Sns Damp

Press the “” key.

The damping can be set between 0.2 and 64 seconds.

Enraf recommends to set the damping on 8 seconds.

Generic:

Online (Generic)

1Device setup

2 PV

3 PV AO 4.000 mA

4 PV LRV

5 PV URV

Give the damping (i.e. 8.0) by means of the numerical key path on the HART

communicator. Then press ENTER <F4>.

15 Press SEND <F2>.


17 HOME <F3>.

Generic:

Online (Generic)

1Device setup

2 PV

3 PV AO 4.000 mA

4 PV LRV

5 PV URV

Appendix


2 PV 3 PV AO 4.000 mA

4 PV LRV 5 PV URV

Zero trim:

Zero trimming the pressure transmitter is necessary in order to compensate for the mounting position errors.

It should be done with the transmitter installed in its final mounting position with only static pressure applied.

I.e. the drain and vent plug must be open and the isolation valve must be closed. Let the temperature

stabilize for 10 to 15 minutes, in order to reduce influence caused by temperature gradients in the sensor

body.

The following procedure can only be followed when the transmitters DDL is installed in the HART

communicator. If this is not the case, then zero trimming has to be done by means of items O1, O2 and O3.

From this menu:


18 Select 2 Diag / Service

Select 3 Calibration

Select 3 Sensor trim

Select 1 Zero trim


20 Wait for approximately 30 seconds to stabilize the zero reading, then press OK <F4>.

21 Press HOME <F3>.

This concludes the configuration of the pressure transmitter with the HART communicator.

22 Switch off the HART communicator.

23 Disconnect the probes from the HART communicator lines.

24 Give EX command on the 847 PET, which then re-starts the instrument and the HART communication.

Generic:

Online (Generic)

1Device setup 2 PV 3 PV AO 4.000 mA 4 PV LRV 5 PV URV

Appendix


Appendix H Zero calibration of pressure transmitters

After installation, the pressure transmitters will have a

small offset. This offset is caused by the mounting

position and hence a zero calibration is required.

Proceed as follows (refer to the figure):

• Close the isolation valve.

vent plug

Caution Having the isolation valve closed for prolonged

periods while the vent and drain plugs are closed, can permanent damage the pressure transmitters.

isolation valve

(ball valve)

drain plug

• Open the vent and drain plug and drain the

product from the transmitter body and piping.

• Allow a 5 minute stabilizing period.

Detail pressure transmitter installation

Do the zero calibration either with the HART Communicator (preferred; refer to Appendix G). Else use the

pressure offset items O1, O2 and O3 as described in the next step.

• Zero calibration by means of pressure offset items:



P1 Pressure of P1 Format according to item PI.

Read offset pressure from pressure transmitter P1.

O1= Pressure offset P1 Format according to item PI.

Copy the value from item P1 into O1.










• Close the drain plug.

• Open the isolation valve

• When product starts to flow out from the vent plug, immediately close the vent plug.

Appendix


Appendix J Related documents

Instruction manual series 854 ATG level gauge

Instruction manual series 854 XTG level gauge

Instruction manual 873 SmartRadar

Instruction manual 970 SmartRadar ATi Instruction manual 971 SmartRadar LTi

Instruction manual 973 SmartRadar LT

Instruction manual 877 FDI Field Display & Interface

Instruction manual 847 Portable Enraf Terminal

Item documentation for Enraf series 854 Level Gauges, 873 SmartRadar, 877 FDI

Installation Info 003 “Installation HTG / HIMS sys ”

Index


Index

Abbreviated HIMS/HTG density . . . . . . . . . . 16, 28

Ambient air density . . . . . . . . 10, 13, 19, 20, 23, 44

ASCII table . . . . . . . . . . . . . . . . . . . . . . . . . . 35, 37

Available pressure transmitters . . . . . . . 13, 23, 31

Calculated HIMS/HTG density . . . . . . . . . . . 16, 28

Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Density . . . . . . . . . . . . . . . . . . . . . . . . . . 16, 18, 20

alarm hysteresis . . . . . . . . . . . . . . . . . . . 13, 23

dimension . . . . . . . . . . . . . . . . . . . . . . . . 11, 21

in air . . . . . . . . . . . . . . . . . . . . . . . 10, 20, 44, 45

in vacuum . . . . . . . . . . . . . . . . . . 10, 20, 44, 45

lower limit . . . . . . . . . . . . . . . . . . . . . . . . 13, 23

observed . . . . . . . . . . . . . . . . . . . . 9, 17, 39, 42

sample . . . . . . . . . . . . . . . . . . . . . . . . . . . 39, 42

upper limit . . . . . . . . . . . . . . . . . . . . . . . . 13, 23

Dimension . . . . . . . . . . . . . . . . . . . . . . . . 11, 21, 30

Display . . . . . . . . . . . . . . . . . . . . . . . . . . 15, 27, 32

Distance P1 - P2 . . . . . . . . . . . . . . . 22, 26, 41, 42

Distance P1 - tank zero . . . . . . . . 12, 14, 22, 38-41

Distance P3 - tank zero . . . . . . . . . . . . . . . . 12, 22

Drain plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Equivalent area . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Fatal HCU / ICU_HPI errors . . . . . . . . . . 16, 28, 32

HART . . . . . . . . . . . . . . . . . . . . . . . . 6, 7, 9, 17, 29

communication errors . . . . . . . . . . . . 16, 28, 32

Communicator . . . . . . . . . . . . . . . 14, 26, 31, 48

device pointer value . . . . . . . . . . . . . . . . . . . 36

device value pointer . . . . . . . . . . . . . . . . . . . 36

HCU board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

High high level alarm . . . . . . . . . . . . . . . . . . . . . 24

High level alarm . . . . . . . . . . . . . . . . . . . . . . . . . 24

HIMS / HTG selection . . . . . . . . . . . . . . . 13, 23, 31

HTG level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

HTG ullage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Hydrostatic deformation . . . . . . . . . . 14, 26, 46, 47

factor . . . . . . . . . . . . . . . . . . . . . . 14, 26, 46, 47

level . . . . . . . . . . . . . . . . . . . . . . . 14, 26, 46, 47

Hydrostatic error request . . . . . . . . . . . . . . . . . . 35

Hydrostatic status request . . . . . . . . . . . . . . . . . 35

ICU_HPI board . . . . . . . . . . . . . . . . . . . . . . . . . 6, 7

Indicator mode . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Isolation valve . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

EH . . . . . . . . . . . . . . . . . . . . . . . . . 16, 28, 32-35

FH . . . . . . . . . . . . . . . . . . . . . . . . . . . 16, 28, 32

H0 . . . . . . . . . . . . . . . . . . . . . . . . . . . 16, 28, 32

H1, H2, H3 . . . . . . . . . . . . 11, 13, 21, 24, 30, 31

HA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

HD . . . . . . . . . . . . . . . . . . . . . . . . 11, 13, 21, 23

HE . . . . . . . . . . . . . . . . . . . . . . . . . . . 16, 28, 32

HH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

HQ . . . . . . . . . . . . . . . . . . . . . . . . . . . 19, 20, 28

HT . . . . . . . . . . . . . . . . . . . . . . . . 13, 23, 31, 34

IF . . . . . . . . . . . . . . . . . . . . . . . . . 14, 26, 46, 47

IL . . . . . . . . . . . . . . . . . . . . . . . . . 14, 26, 46, 47

IM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23, 34

LA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

LD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12, 22

LG . . . . . . . 9, 10, 13, 17, 19, 23, 33, 39, 42, 43

LL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

LM . . . . . . . . . . . . . . . . . . . . . 10, 12, 19, 22, 33

LN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12, 22

LP . . . . . 9, 10, 12, 14, 17, 19, 22, 34, 38-41, 46

LS . . . . . . . . . . . . . . . . . . . . . 17, 19, 26, 41, 42

LU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

M1, M2, M3 . . . . . . . . . . . 11, 13, 21, 23, 30, 31

N1, N2, N3 . . . . . . . . . . . . . . . . . . . . . 16, 28, 32

O1, O2, O3 . . . . . . . . . . . . . . . . . 11, 21, 30, 52

OB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23, 34

P0 . . . . . . . . . . . . . . . . . . 11, 15, 21, 27, 30, 32

P1 . . . . . . . . . . . . . . . . . . . . . . 9, 16, 17, 28, 52

P2 . . . . . . . . . . . . . . . . . . . . . . . . . . . 17, 28, 52

P3 . . . . . . . . . . . . . . . . . . . 9, 16, 17, 28, 32, 52

P4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16, 28

P5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

P7 . . . . . . . . . . . . . . . . . . . 9, 10, 16, 19, 28, 39

P8 . . . . . . . . . . . . . . . . . . . . . . . . . . . 19, 28, 42

PA . . . . . . . . . . . . . . . . . . . . . 13, 23, 31, 33, 34

PH . . . . . . . . . . . . . . . . . . 11, 13, 21, 24, 30, 31

PI . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11, 21, 30

PR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Q1, Q2, Q3 . . . . . . . . . . . . . . . . . . . . 16, 28, 32

QF . . . . . . . . . . . . . . . . . . . . . . . . . 16, 28, 32-35

QQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16, 28

RF . . . . . . . . . . . . . . . 10, 13, 19, 20, 23, 33, 44

Items RG . . . . . . . . . 10, 13, 15, 19, 20, 23, 27, 33, 45

28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11, 21

29 . . . . . . . . . . . . . . . . . . . . . . . . . . . 11, 21, 30

AH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

DD . . . . . . . . . . . . . . . . . . . . . . . . . . . 11, 21, 27

DE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

DI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11, 21

DL . . . . . . . . . . . . . . . . . . . . . . . . 11, 13, 21, 23

DQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16, 28

DU . . . . . . . . . . . . . . . . . . . . . . . . 11, 13, 21, 23

RJ . . . . . . . . . . . . . . . . . . . . . . . . 15, 27, 33, 45

SR . . . . . . . . . . . . . . . . . . . . . 16, 28, 32, 48, 49

TT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

UR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

VP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

VQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

VV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36


Index

Last fatal HCU / ICU_HPI error . . . . . . . 16, 28, 32

Level . . . . . . . . . . . . . . . . . . . . . . . . . . . 9, 10, 17-19

alarm hysteresis . . . . . . . . . . . . . . . . . . . . . . 24

alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

status conversion . . . . . . . . . . . . . . . . . . . . . 24

type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Level gauge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Level measurement . . . . . . . . . . . . . . . . . . . . . . . 9

Local gravity . . . . . . . . . . . . . . . . . . . . . . 13, 23, 43

Low level alarm . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Low low level alarm . . . . . . . . . . . . . . . . . . . . . . 24

Pressure

alarm hysteresis . . . . . . . . . . . . . . . . 13, 24, 31

dimension . . . . . . . . . . . . . . . . . . . . . 11, 21, 30

measurement . . . . . . . . . . . . . . . . . . . . . . . . 29

offset P1, P2, P3 . . . . . . . . . . . . . . . . . . . . . . 52

P1, P2, P3 . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

transmitter . . . . . . . . . . . 6, 9, 17, 29, 48, 49, 52

Serial number pressure transmitter . . . . 16, 28, 32

Stop HART request . . . . . . . . . . . . . . . . 16, 28, 32

Stratification . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Tank gas density . . . . . . . . . . . . 10, 13, 19, 23, 45

Manual Temperature pressure transmitter . . . . . 16, 28, 32

density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

tank gas density . . . . . . . . . . . . . . . . . . . 15, 27

vapour pressure . . . . . . . . . . . . . . . . 15, 27, 32

Mass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Maximum trip pressure . . . . . . . . . . . . . . 13, 24, 31

Minimum HIMS level . . . . . . . . . . . . . . . . . . . . . . 12

Minimum HTG level . . . . . . . . . . . . . . . . . . . . . . 22

Minimum trip pressure . . . . . . . . . . . . . . 13, 23, 31

Note . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Optional board selection . . . . . . . . . . . . . . . . . . . 23

Ullage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Upper reference . . . . . . . . . . . . . . . . . . . . . . . . . 25

point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Vapour density . . . . . . . . . . . 10, 13, 19, 20, 23, 45

Vent plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

XPU board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Zero calibration . . . . . . . . . . . . . . . . . 33, 34, 51, 52

Instruction manual HIMS / HTG and vapour pressure (P3 ... · Page 6 Introduction Instruction manual...

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Transcript of Instruction manual HIMS / HTG and vapour pressure (P3 ... · Page 6 Introduction Instruction manual...