UNI-TROLTM GAS CONTROLLER - Automation Solutions Rosem… · · 2012-08-23UXG-100-LEL = 0 to 100%...

MODELS: U1G, U2G and U4G

UNI-TROL GAS CONTROLLERTM

One, Two and Four-Channel Field-Mount Controller

Part Number: MAN-0003-00 Rev. 5

March 2004

Important Information

If the products or procedures are used for purposes other than as described in the manual,without receiving prior confirmation of validity or suitability, Net Safety Monitoring Inc.,does not guarantee the results and assumes no obligation or liability.

No part of this manual may be copied, disseminated or distributed without the expresswritten consent of Net Safety Monitoring Inc.

Net Safety Monitoring Inc., products are carefully designed and manufactured from highquality components and can be expected to provide many years of trouble free service.Each product is thoroughly tested, inspected and calibrated prior to shipment. Failurescan occur which are beyond the control of the manufacturer. Failures can be minimizedby adhering to the operating and maintenance instructions herein. Where the absolutegreatest of reliability is required, redundancy should be designed into the system.

Warranty

Net Safety Monitoring Inc., warrants its sensors against defective parts and workmanship for aperiod of 24 months from date of purchase; other electronic assemblies for 36 months from dateof purchase.No other warranties or liability, expressed or implied, will be honoured by Net Safety MonitoringInc.

Contact Net Safety Monitoring Inc., or an authorized representative for details.

We welcome your input at Net Safety Monitoring. If you have any comments please contact us atthe phone/address below or visit our web site and complete our on-line customer survey: www.net-safety.com.

Contact Information

Net Safety Monitoring Inc.2711 39th Ave., N.E.Calgary, AB T1Y 4T8CanadaTelephone: (403) 219-0688 Fax: (403) 219-0694www.net-safety.comE-mail: [email protected]

Copyright © 2004 Net Safety Monitoring Inc. Printed in Canada

Table of Contents

WarrantyContact InformationUnit I GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 1 -DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 1 -

FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 1 -

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 1 -

Figure 1 - Controller Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 2 -

BASIC OPERATION - CONTROLLER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 2 -

FACEPLATE DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 2 -

Figure 2 - Controller Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 3 -

OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 3 -

Current Outputs ...........................................................................................................-3-

Figure 3 - Jumper Selection for Isolated or Non-Isolated Current Outputs . . . . . . . . . . - 4 -

Table 1 - Current Output Signal Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 4 -

PROGRAMMING OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 4 -

Table 2 - Selectable Output Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 5 -

EXTERNAL RESET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 5 -

AUTOMATIC DIAGNOSTICS AND FAULT IDENTIFICATION . . . . . . . . . . . . . . . . . . - 5 -

OPERATING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 5 -

Normal Operating Mode: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 6 -

Reset Mode: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 6 -

Forced Reset Mode: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 6 -

Forced Display (FdP): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 6 -

Sensor Replacement Mode (SrP): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 7 -

Sensor Calibration Mode (CAL): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 7 -

Set-Point Display (Spd): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 7 -

Address Set (Adr Set) (Do not use): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 7 -

Error Message Display (Err Chc): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 7 -

Channel Display (Chd): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 7 -

Unit II SYSTEM INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 8 -INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 8 -

SENSOR LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 8 -

GENERAL W IRING REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 8 -

CONTROLLER W IRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 9 -

Figure 4a - W iring for U1G with Non-isolated Current Output . . . . . . . . . . . . . . . . . . . . -10

Figure 4b - W iring for U1G with Isolated Current Output . . . . . . . . . . . . . . . . . . . . . . -11 -

Figure 5a - W iring for U2G with Non-isolated Current Output . . . . . . . . . . . . . . . . . . . -12 -

Figure 5b - W iring for U2G with Isolated Current Output . . . . . . . . . . . . . . . . . . . . . . -13 -

Figure 6a - W iring for U4G with Non-isolated Current Output . . . . . . . . . . . . . . . . . . . -14 -

Figure 6b - W iring for U4G with Isolated Current Output . . . . . . . . . . . . . . . . . . . . . -15 --

DIP SW ITCH SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 16 -

Figure 7a - Dip Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 16 -

Figure 7b - Dip Switch Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 16 -

ACTIVE CHANNELS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 16 -

CALIBRATION GAS CONCENTRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 17 -

POW ER-UP TIME DELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 18 -

ALARM SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 19 -

LATCHING/NON-LATCHING SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 20 -

ENERGIZED/DE-ENERGIZED SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 21 -

RELAY SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 21 -

Figure 8a - Relay Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 21 -

Figure 8b - Relay Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 21 -

INSTALLATION CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 21 -

Table 3 - Summary of Dip Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 22 -

Table 4 - Factory Dip Switch Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 22 -

Unit III SYSTEM OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 23 -MENU AND FUNCTION SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 23 -

Table 5 - Menu and Function Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 23 -

Table 6 - Main Menu Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 24 -

Table 7 - Special Function Menu Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 24 -

START-UP PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 24 -

MAIN MENU SELECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 25 -

ERROR CHECK MODE (Err Chc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 25 -

SET-POINT DISPLAY MODE (SPd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 26 -

Table 8 - System Status Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 27 -

SENSOR CALIBRATION (CAL) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 28 -

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 28 -

Calibration Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 28 -

SENSOR REPLACEMENT MODE (SrP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 29 -

SPECIAL FUNCTION MENU SELECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 30 -

FORCED CURRENT OUTPUTS (FoP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 30 -

CURRENT CALIBRATION MODE (CuC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 30 -

ADDRESS SET MODE (Adr Set) (Do not use) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 30 -

CHANNEL DISPLAY(Chd) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 31 -

BYPASS (bPS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 31 -

OPERATING MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 31 -

RESET MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 31 -

FORCED RESET MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 31 -

NORMAL OPERATING MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 32 -

FORCED DISPLAY (FdP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 33 -

Unit IV SYSTEM MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 33 -ROUTINE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 33 -

MANUAL CHECK OF OUTPUT DEVICES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 33 -

SYSTEM CHECK IN NORMAL MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 33 -

SENSOR REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 34 -

REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 34 -

DEVICE REPAIR AND RETURN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 35 -

Table 9 - Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 36 -

Appendix A Electrostatic Sensitive Device Handling Procedure . . . . . - 37 -Appendix B Procedure For Activating Reed Switches . . . . . . . . . . . . . . - 38 -Appendix C Record of Dip Switch Settings . . . . . . . . . . . . . . . . . . . . . . . - 39 -Appendix D Wire Resistance In Ohms . . . . . . . . . . . . . . . . . . . . . . . . . . . - 40 -

- 1 -

Unit I GENERAL INFORMATION

DESCRIPTION

The Uni-Trol™ U1G, U2G and U4G Controllers accept 4-20 mA dc analog input signals from Net

Safety combustible and toxic gas sensors. Controller response includes actuation of relays for

direct control of field response devices, 4-20 mA outputs and a full array of faceplate indicators.

The type of controller and its range can be determined from the example model number as shown

below:

UXG-100-LEL = 0 to 100% LEL controller

2UXG-100-H2S = 0 to 100 ppm H S controller

UXG-1000-CO = 0 to 1000 ppm CO controller

2UXG-20-SO2 = 0 to 20 ppm SO controller

NOTE

The controller displays the gas concentration in parts per million (ppm) for all types of

gases unless it is a combustible gas controller in which case the gas concentration is

shown as % of lower explosive limit (LEL).

FEATURES

C Controller accepts 4 to 20 mA analog inputs from Net Safety combustible and toxic gas

sensors

C Non-Intrusive one person calibrations

C Two digital displays, one bar graph display and high intensity LEDs indicate important

system status

C AutoCal feature provides easy and accurate calibration

C Microprocessor-based controller is easily field programmable

C 4-20 mA current outputs to send important system information to other devices

C Relay alarm and fault outputs

SPECIFICATIONS

C Operating Voltage:

24 Volts dc. Device can operate between 18 and 32 V dc

C Power Consumption (Controller Only):

2.4 W atts nominal, 4.4 W atts maximum (100 mA nominal, 180 mA maximum at

24 V dc)

Maximum start-up current is 1.5 Amperes for 10 milliseconds. Power supplies

with foldback current limiting are not recommended.

C Maximum Ripple:

Ripple should not exceed 5 Volts peak-to-peak. The sum of dc plus ripple must

be $18 V dc and #32 V dc

C Temperature Range:

Operating: -40ºC to +85ºC (-40ºF to +185ºF)

Storage: -55ºC to +150ºC (-65ºF to +302ºF)

C Relay Contacts:

Normally open/normally closed contacts rated at 5 Amperes at 30 V dc/ 250 V ac

- 2 -

C Current Outputs:

Two 4-20 mA dc current, with a maximum external loop resistance of 600 S at

18-32 V dc

C Dimensions:

Refer to Figure 1

C Shipping Weight (Approximate):

2 lbs. (0.9 kilograms)

C Certification:

CSA Certified for Class 1, Division 1 Group B, C and D hazardous locations.

Figure 1 - Controller Dimensions

BASIC OPERATION - CONTROLLER

FACEPLATE DESCRIPTION

The controller faceplate provides a number of LEDs for identifying status conditions, two digital

displays and a bar graph display for indicating the sensor inputs, as well as MENU/SET and

SELECT/RESET magnetic reed switches for programming, calibrating and resetting the system.

Refer to Figure 2.

S Digital Displays - Two digital displays are used to display the sensor inputs in both the

Normal and Calibrate Modes; one display indicates the channel and one display indicates

the corresponding sensor input. In the event of a fault, it identifies the nature of the fault

using an alphanumeric code. In the Normal Operating Mode, each channel is sequentially

displayed for 5 seconds. In other operating modes, the digital displays show the alarm

set-points and programmed calibration gas concentration. A negative zero drift condition

is indicated by a minus sign in the left-hand digit. Since at least one display is always lit, it

also functions as a power indicator.

S Bar Graph Display - The common 10-segment bar graph display provides readings of

the four sensor inputs in 5% of full range increments (ie. for a 50 ppm controller each

segment represents 2.5 ppm, which is 5% of the full range of 50 ppm), from 0% to 50% of

full range; all 10 segments are illuminated for 50% of full range and higher gas

concentrations.

S High Alarm LED (HI) - Flashes in response to a sensor signal that exceeds the high

set-point.

S Low Alarm LED (LOW) - Flashes in response to a sensor signal that exceeds the low

set-point.

- 3 -

S Calibrate LED (CAL) - Illuminates when the controller is in the Calibrate Mode.

S Fault LED (Fault) - Illuminates upon detection of an overall system fault or a channel

related fault.

S Channel LEDs - illuminated when status on the corresponding channel is displayed on

the common indicators (digital displays and bar graph). During power-up, a channel LED

is on if the channel is selected for operation.

S MENU/SET reed switch - Changes the menu display as well as other system

programming and calibration functions.

S SELECT/RESET reed switch - Menu selection and other system programming and

resets the controller.

Figure 2 - Controller Front Panel

OUTPUTS

Relay Outputs:

The relay outputs have SPDT contacts rated at 5 Amperes at 30 V dc or 250 V ac The four relays

include an Area 1 low alarm (channels 1 and 2), an Area 2 low alarm (channels 3 and 4), one

common high alarm, and a fault alarm.

RECOMMENDATION

The fault relay output should not be used to activate an automatic shutdown procedure.

The fault output indicates a potential problem with the controller, not an alarm condition.

Current Outputs:

Two 4-20 mA dc current outputs for transmitting system information to other devices are also

included. The current outputs can be wired for isolated or non-isolated operation by changing the

positions of jumpers, as shown in Figure 3. Refer to Table 1 for a description of the current output

signal levels.

- 4 -

Figure 3 - Jumper Selection for Isolated or Non-Isolated Current Outputs

Table 1 - Current Output Signal Levels

Current Output Situation

0 mA Open or shorted signal output or loss of power

1 mA Fault or Power up

2 mA Power Fault

3 mA Sensor Calibration

4 mA to 20 mA 0 to 100% of full scale

PROGRAMMING OPTIONS

A set of dip-switches, located on the circuit board, can be used to ‘program’ various options and

set-points, including:

-the channels selected for operation

-low and high alarm settings

-calibration gas concentration

-power-up delay time (either 45 or 90 seconds)

-latching / non-latching selection

-energized / de-energized selection

- 5 -

The alarm outputs are DIP-switch programmable for either normally energized or normally de-

energized operation (programmable as a group only, not individually). The fault output is normally

energized. The low alarm outputs are programmable for either latching or non-latching operation.

The high alarm output is always latching and the fault output is non-latching. Refer to Table 2.

Table 2 - Selectable Output Options

OUTPUT

Selectable Normally

Open/Closed

Selectable Normally

Energized/De-Energized

Selectable

Latching/Non-latching

LOW Y Y Y1 2

HIGH Y Y N2 3

FAULT Y N N4 5

Low alarms are programmed together, not individually1

Programmable together, not individually2

High alarm relay is always latching3

Fault relay is normally energized4

Fault relay is non-latching5

EXTERNAL RESET

A normally open, momentary closure switch can be connected between the external reset terminal

and the negative power terminal to provide remote reset capabilities.

AUTOMATIC DIAGNOSTICS AND FAULT IDENTIFICATION

The microprocessor-based controller features self-testing circuitry that continuously checks for

problems that could prevent proper system response. W hen power is applied, the microprocessor

automatically tests memory. In the Normal Operating Mode, it continuously monitors the input

signals from the sensor/transmitter to ensure proper functioning. In addition, a ‘watchdog’ timer is

maintained to ensure that the program is running correctly. The timer resets the micro-controller if

it enters erroneous processor states within a reasonable period of time.

If a fault is detected, the Fault LED illuminates, the digital display identifies that a fault has

occurred, the fault relay output becomes de-energized, and the current output drops to 1 mA. The

nature of the fault can be identified by a numeric code, which can be viewed in the Error Message

Display mode.

OPERATING MODES

The controller can operate in any of the modes discussed in this section. Operating modes other

than Normal are selected by activating the appropriate MENU/SET and SELECT/RESET reed

switches located on the controller front panel. Refer to Figure 2 for a diagram of the controller

front panel.

NOTE

This section provides an overview of the basic operation of the controller. Refer to ‘Unit

III’ for detailed instructions and description.

Normal Operating Mode:

- 6 -

If no alarms or faults are occur, the module will be in a Level 1 Display Mode; the bar graph and

digital display sequentially indicate the sensor inputs for 5 seconds on each channel, and all LEDs

are off except the appropriate channel LEDs. Relay outputs are in their normal state, and the

current outputs correspond to the sensor inputs.

If a low alarm condition occurs on any channel, the module will be in a Level 2 Display Mode; the

bar graph and digital display will display only the channel that is in alarm. If more than one

channel is in alarm, the channel with the highest alarm will be displayed and the channel LED for

any other channel(s) in alarm will flash. The low alarm LED will flash, the low alarm relay(s)

change state, and the current outputs change to indicate the alarm. If the signal(s) decreases

below the low set-point again, the corresponding alarm relays return to their normal state if

programmed for non-latching operation and remain unchanged if programmed for latching

operation. The current outputs will return to the normal output level. The low alarm LED will still

illuminate whenever the channel which had the alarm condition is displayed.

If a high alarm condition occurs, the module will be in a Level 3 Display Mode; the bar graph and

digital display will cycle through all channels with a high alarm condition. W hile one channel is

displayed, the channel LED for any other channel in a high or low alarm state will flash.

NOTE

When 1 or more channels are in a high alarm condition and 1 or more channels are in a

low alarm condition, only the channels in the high alarm condition will be cycled on the

display. The channel LED for any channel in the low alarm condition will flash.

Reset Mode:

The Reset Function is entered by activating the SELECT/RESET reed switch located on the front

panel of the controller (refer to Figure 2). W hen the SELECT/RESET reed switch is activated

momentarily, all LEDs turn off and all outputs return to their normal condition if no alarms or

faults are occurring (basic reset).

Forced Reset Mode:

If any of the channels receive a reading beyond 100% of full scale, a reset will not clear the

alarms, even if the channel has returned to levels below the low alarm set point. The error

resulting from this occurrence must be cleared and a forced reset applied. To apply a forced

reset, activate the SELECT/RESET reed switch for 1 second, the LEDs turn off and the outputs

return to their normal condition. The remote reset performs a forced reset.

NOTE

The remote reset performs a reset function only. It cannot be used for other controller

functions.

Forced Display (FdP):

This mode forces a sequential display of all the active channels. It can be used during alarm

situations when the digital and bar graph display normally remain on the channel with the highest

alarm condition. This function is also useful while in menu functions that do not show the sensor

readings.

Sensor Replacement Mode (SrP):

- 7 -

This mode inhibits all controller outputs to allow replacement of the sensor(s) without removing

power from the controller. Alarm set-points and calibration gas concentration are not affected. The

left display will show ‘SrP’ while in the sensor replace mode. The right display will show the status

of the sensor being replaced (‘NoS’ means no sensor is connected). The fault LED is on and the

fault relay is de-energized. The channel LED will be on for the sensor being replaced.

All other sensors remain active during sensor replace mode. If an alarm condition occurs on one

of the active channels while in this mode, the appropriate channel LED will flash and relays and

current outputs will act accordingly. All other display features will be inhibited. In order to exit this

mode the SELECT/RESET reed switch must be activated. The controller will perform a power-up

countdown (45 or 90 seconds) for the sensor that was replaced and the affected current output

will be 1 mA during this time.

Sensor Calibration Mode (CAL):

The Uni-Trol Controller uses a fully automatic calibration procedure that requires no adjustments™

by the operator. The controller displays ‘Air’ on the left display and the channel status on the right

display while automatically performing the zero adjustments. Next the controller will signal the

user to apply the calibration gas by alternating ‘gAS’ and ‘in’ on the display. W hen the controller

detects that the gas has been applied to the sensor, the display will read ‘gAS’. Once the

controller has finished the gain adjustments it will alternate ‘Cut’ and ‘gAS’ on the display, telling

the user that it is time to remove the calibration gas. Upon completion of the calibration the

controller will automatically return to the normal operating mode.

If the operator fails to complete the calibration procedure, if an error in the calibration procedure

occurs, or if a successful calibration cannot be completed, the microprocessor will automatically

return to the Normal Operating Mode and continue to use the previous calibration data. A fault

indication will be displayed until a reset occurs. If the microprocessor determines that the sensor

is approaching the end of its useful life, a fault code will indicate this.

W hile in the calibration mode, all controller outputs for the affected channel are inhibited, the

current output is 3 mA, and the ‘Cal’ LED is illuminated. All other channels remain active,

however, if an alarm condition occurs, the only display indication will be a flashing channel LED;

all other display features will be inhibited.

Set-Point Display (Spd):

In this mode, the digital display sequentially shows the programmed low and high alarm set-points

and calibration gas concentration. Each value is displayed for approximately 2 seconds.

Address Set (Adr Set) (Do not use):

Do not use the communication addresses.

Error Message Display (Err Chc):


problems that could prevent proper system response. As a diagnostic and troubleshooting tool,

identifiable faults are displayed on the digital display, using error codes, during the Error Message

Display Mode. The controller will also display an error message after the last channel in the

cycling routine.

Channel Display (Chd):

In this mode, the displays can be forced to monitor only one channel, as long as no alarms are

occurring on other channels. If an alarm occurs on the channel that is being monitored, the

controller will remain in the manual display mode. If an alarm occurs on any other channel the

controller will automatically return to the Normal Operating Mode.

Unit II SYSTEM INSTALLATION

- 8 -

INSTALLATION

SENSOR LOCATIONS

Proper location of the sensors is essential for providing maximum protection. The method for

deciding the most effective number and placement of sensors varies depending on the conditions

at the job site. The individual performing the installation must rely on experience, common sense,

and knowledge of plant operations to determine the number of sensors needed and the best

controller locations to adequately protect the area.

The following factors are important and should be considered for every installation:

< Sensors should be located where they are safe from potential sources of contamination.

< Refer to sensor application manuals and follow guidelines for sensor installation.

< Sensors must be accessible for testing and calibration.

< Exposure to excessive heat or vibration can cause premature failure of electronic devices,

and should be avoided if possible.

GENERAL WIRING REQUIREMENTS

NOTE

The wiring procedures in this manual are intended to ensure proper functioning of the

device under normal conditions. However, because of the many variations in wiring codes

and regulations, total compliance to these ordinances cannot be guaranteed. Be certain

that all wiring complies with applicable regulations that relate to the installation of

electrical equipment in a hazardous area. If in doubt, consult a qualified official before

wiring the system .

The use of shielded cable is highly recommended for any signal wires to protect against

interference caused by extraneous electrical 'noise'. This includes power and current outputs;

relay outputs do not require shielded cable. In applications where the wiring cable is installed in

conduit, the conduit must not be used for wiring to other electrical equipment.

W ater will damage electronic devices. Moisture in the air can condense within electrical conduit

and drain into the enclosure, therefore, water-proof and explosion-proof conduit seals are

recommended to prevent water accumulation within the enclosure. Seals should be located as

close to the device as possible and not more than 18 inches (46 cm) away. Explosion-proof

installations may require an additional seal where conduit enters a non-hazardous area. Conform

to local wiring codes.

W hen pouring a seal, use a fibre dam to assure proper formation of the seal. The seals should

never be poured at temperatures below freezing.

The jacket and shielding of the cable should be stripped back to permit the seal to form around

the individual wires. This will prevent air, gas and water leakage through the inside of the shield

and into the enclosure.

It is recommended that explosion-proof drains and conduit breathers be used. In some

applications, alternate changes in temperature and barometric pressure can cause 'breathing'

which allows moist air to enter and circulate inside the conduit. Joints in the conduit system are

seldom tight enough to prevent this 'breathing'.

The maximum distance between the sensor and controller is limited by the resistance of the

connecting wiring, which is a function of the gauge of the wire being used. Refer to the manuals

- 9 -

on the sensors used (and transmitters if used) for maximum wiring distances and wiring

instructions.

CONTROLLER WIRING

NOTE

The controller contains semiconductor devices that are susceptible to damage by

electrostatic discharge. An electrostatic charge can build up on the skin and discharge

when an object is touched. Therefore, use caution when handling, taking care not to touch

the terminals or electronic components. For more information on proper handling, refer to

the Appendix A.

The Uni-trol™ controllers can be wired for isolated or non-isolated current outputs by changing the

positions of ‘J12' and ‘J18', as shown in Figure 3. Figures 4a, 5a and 6a show the proper wiring of

the controllers for non-isolated current outputs with 2 and 3 wire sensors. Figures 4b, 5b and 6b

show the proper wiring for isolated current outputs with 2 and 3 wire sensors.

NOTE

If local wiring codes permit, and if a ground fault monitoring system is not being used, the

minus side of the DC power source can be connected to chassis (earth) ground.

Alternatively, a 0.47 microfarad, 100 Volt capacitor can be installed (-ve to ground) for

best immunity against electromagnetic interference.

- 10 -

Figure 4a - W iring for U1G with Non-isolated Current Output

- 11 -

Figure 4b - W iring for U1G with Isolated Current Output

- 12 -


- 13 -


- 14 -


- 15 -


- 16 -

Figure 7b - Dip Switch

DIP SWITCH SETTINGS

NOTE

See Table 4 for a list of the standard factory settings.

It is essential that the controller be properly programmed before applying power to the system.

There are three banks of dip switches located on the controller. Each switch bank has eight

individual switches that can be set to an on or off position.

NOTE

The dip switches are located on the circuit board. The switch banks are numbered from

bottom to top as numbers SW3, SW4, and SW5. Refer to Figure 7a. Individual switches

are referenced as ‘X.Y’, where ‘X’ refers to the bank number and ‘Y’ refers to the switch

number on ‘X’ bank. For example, switch 3.4 (SW3.4) is switch number four on bank

number three.

Switches are set as either OFF or ON. Refer to Figure 7b.

Figure 7a - Dip Switch Position

NOTE: TO MAKE DIP SWITCH CHANGES

TAKE EFFECT, IT IS VERY IMPORTANT THAT POWER TO THE CONTROLLER IS CYCLED

OFF AND ON AFTER ANY DIP SWITCH CHANGES!

ACTIVE CHANNELS

Switches for setting the active channels (the channels that are to have sensors/transmitters

attached) can be found on Switch Bank 3, switches 1 to 4 (SW 3.1 through SW 3.4). Set the

designated switch to OFF if the channel is to be connected (sensor attached), and ON if the

channel is not to be used.

SW 3.1: OFF channel 1 connected

ON channel 1 not connected







CALIBRATION GAS CONCENTRATION

- 17 -

Calibration gas concentration for all channels are set together using the dip switches on the circuit

board. To select the calibration gas concentration of 50% of full scale, set SW 3.5 to OFF. If a

selectable value (from 20% to 99% of full scale) is required, set SW 3.5 to ON; SW 4.1 through

SW 4.7 must then be used to select the calibration gas concentration.

SW 3.5: OFF calibration gas set to 50%

(ignore SW 4.1 - SW 4.7)

ON calibration gas selectable

(set SW 4.1 - SW 4.7)

NOTE

If SW3.5 is set to ON’, it is very important to accurately set SW4.1 to SW4.7.

If the selectable option is chosen, the calibration gas concentration must be set. This is done on

Switch Bank 4, switches 1 through 7 (SW 4.1 to SW 4.7). The required calibration gas

concentration must be set with these switches using the binary counting system. ON selects the

value listed below; OFF selects a zero.

SW 4.1: ON 1%

SW 4.2: ON 2%

SW 4.3: ON 4% calibration

SW 4.4: ON 8% gas

SW 4.5: ON 16% concentration

SW 4.6: ON 32%

SW 4.7: ON 64%

The switches can be used in combination to select concentrations from 20% to 99% of full scale.

Combustible Gas Controller Example:

SW 4.1: OFF

SW 4.2: OFF

SW 4.3: ON calibration gas

SW 4.4: ON concentration

SW 4.5: ON = 60% LEL

SW 4.6: ON

SW 4.7: OFF

1000 ppm Toxic Gas Controller Example:

SW 4.1: OFF

SW 4.2: OFF



SW 4.5: ON = 600 ppm

SW 4.6: ON

SW 4.7: OFF


- 18 -

SW 4.1: OFF

SW 4.2: OFF



SW 4.5: ON = 60 ppm

SW 4.6: ON

SW 4.7: OFF


SW 4.1: OFF

SW 4.2: OFF



SW 4.5: ON = 30 ppm

SW 4.6: ON

SW 4.7: OFF


SW 4.1: OFF

SW 4.2: OFF



SW 4.5: ON = 15 ppm

SW 4.6: ON

SW 4.7: OFF


SW 4.1: OFF

SW 4.2: OFF



SW 4.5: ON = 12 ppm

SW 4.6: ON

SW 4.7: OFF

NOTE

If a calibration gas concentration greater than 99% or less than 20% of full scale is

programmed, the controller will give a configuration error (E90) when power is applied.

POWER-UP TIME DELAY

SW 3.6 is used to select the power-up time delay.

SW 3.6: OFF 45 seconds

ON 90 seconds

NOTE

SW3.7 and SW3.8 are not used.

ALARM SETTINGS

- 19 -

Switch bank 4, switch 8 (SW 4.8) is used to set the low and high alarm to a default or selectable

value. If SW 4.8 is OFF’ the low alarm will be set to 20% of the full scale and the high alarm to

40% of full scale. If SW 4.8 is ON, the low and high alarm are selectable, using SW 5.3 to SW 5.8.

SW 4.8: OFF low alarm @ 20% full scale

high alarm @ 40% full scale

(ignore SW 5.3 - SW 5.8)

ON selectable alarm

(set SW 5.3 - SW 5.8)

NOTE

If SW4.8 is set to ON, it is very important to accurately set SW5.3 to SW5.8.

If the selectable option is chosen, the alarms must be set with SW 5.3 to SW 5.8. The low alarm

can be set from 5% to 40% of full scale and the high alarm is automatically set at twice the low

alarm value. The low alarm value is set using the binary counting system. ON selects the value

listed below; OFF selects a zero.

SW 5.3: ON 1%

SW 5.4: ON 2%

SW 5.5: ON 4%

SW 5.6: ON 8%

SW 5.7: ON 16%

SW 5.8: ON 32%

The switches can be used in combination to select low alarm settings from 5% to 40% of full

scale. If a low alarm level less than 5% or greater than 40% of full scale is programmed, the

controller will give a configuration error (E90) upon power up.

Combustible Gas Controller Example:

SW 5.3: OFF

SW 5.4: OFF

SW 5.5: ON low alarm 12% LEL

SW 5.6: ON high alarm 24% LEL

SW 5.7: OFF

SW 5.8: OFF

1000ppm Toxic Gas Controller Example:

SW 5.3: OFF

SW 5.4: OFF

SW 5.5: ON low alarm 120 ppm

SW 5.6: ON high alarm 240 ppm

SW 5.7: OFF

SW 5.8: OFF


SW 5.3: OFF

- 20 -

SW 5.4: OFF



SW 5.7: OFF

SW 5.8: OFF


SW 5.3: OFF

SW 5.4: OFF



SW 5.7: OFF

SW 5.8: OFF


SW 5.3: OFF

SW 5.4: OFF



SW 5.7: OFF

SW 5.8: OFF


SW 5.3: OFF

SW 5.4: OFF

SW 5.5: ON low alarm 2.4 ppm

SW 5.6: ON high alarm 4.8 ppm

SW 5.7: OFF

SW 5.8: OFF

NOTE

IT IS VERY IMPORTANT THAT POWER TO THE CONTROLLER IS RECYCLED

AFTER ANY DIP SWITCH CHANGES, TO MAKE THE CHANGES TAKE EFFECT!

LATCHING/NON-LATCHING SELECTION

Switch Bank 5, switch 1 is used to set the low alarm relays for latching or non-latching operation;

the high alarm is always latching and the fault is always non-latching.

SW 5.1: OFF low alarm relay latching operation

ON low alarm relay non-latching operation

- 21 -

Figure 8b - Relay SettingsFigure 8a - Relay Position

ENERGIZED/DE-ENERGIZED SELECTION

Switch Bank 5, switch 2 (SW 5.2) is used to set the high and low alarm relays for normally

energized or normally de-energized operation; the fault relay is always normally energized.

SW 5.2: OFF alarm relays normally energized

ON alarm relays normally de-energized

Refer to Table 3 for a summary of the dip switch settings and Table 4 for the standard factory

settings.

RELAY SETTINGS

There are four relays on the controller circuit board that can be set up for normally open or

normally closed operation by changing the positions of the ‘FAULT’, J2', ‘J3' and ‘J4' which are

located beside the relays. See Figure 8a for the location of the relays on the circuit board and

Figure 8b for the correct settings.

INSTALLATION CHECKLIST

The following checklist is provided as a means of double checking the system to be sure that all

phases of system installation are complete and have been performed correct.

* Controller is securely mounted and sensor is oriented correctly

* All cable shields are properly grounded at one end only

* Explosion-proof conduit seals have been installed at all conduit entries (if conduit is being used)

* Sensor to controller wiring is correct

* Power wiring to the controller is installed and power source is operational

* External loads are properly connected to the controller

* Controller is programmed as needed. Record this information for future reference. A table isprovided in the appendix for this purpose

* Controller is properly installed in the housing

* Proper ventilation is provided to prevent overheating of the controller

Table 3 - Summary of Dip Switch Settings

- 22 -

SWITCH (OPEN - off) (CLOSED - on)

SW 3.7 & SW 3.8 NOT USED

SW 3.1 Channel 1 connected Channel 1 not connected




SW 3.5 Calibration gas concentration is

set to 50% of full scale (ignore

SW 4.1 to SW 4.7)

Calibration gas concentration is

selectable using SW 4.1 to SW 4.7

SW 3.6 Power-up time delay is 45 seconds Power-up time delay is 90 seconds

SW 4.1 - SW 4.7 Set calibration gas concentration from

20% to 99% of full scale

SW 4.8 LOW alarm @ 20% of full

scale/HIGH alarm @ 40% of full

scale (ignore SW 5.3 to SW 5.8)

Selectable alarm settings using

SW 5.3 to SW 5.8 (LOW = 5% to 40%

of full scale; HIGH = 2 x LOW )

SW 5.1 LOW alarm relay is latching LOW alarm relay is non-latching

SW 5.2 LOW and HIGH alarm relays

normally energized

LOW and HIGH alarm relays normally

de-energized

SW 5.3 - SW 5.8 Set LOW alarm settings from 5% to

40% of full scale (HIGH alarm is twice

the LOW alarm setting)

Table 4 - Factory Dip Switch Settings

2 2 2Switch LEL 100 ppm H S 50 ppm H S 20 ppm SO

3.1 OFF OFF OFF OFF

3.2 OFF OFF OFF OFF

3.3 OFF OFF OFF OFF

3.4 OFF OFF OFF OFF

3.5 OFF OFF ON ON

3.6 OFF OFF OFF OFF

3.7 NOT USED NOT USED NOT USED NOT USED

3.8 NOT USED NOT USED NOT USED NOT USED

4.1 OFF OFF OFF OFF

4.2 OFF OFF OFF ON

4.3 OFF OFF OFF OFF

4.4 OFF OFF ON OFF

4.5 OFF OFF OFF ON

4.6 OFF OFF ON ON

4.7 OFF OFF OFF OFF

4.8 OFF ON ON ON

5.1 ON ON ON ON

5.2 ON ON ON ON

5.3 OFF OFF OFF ON

5.4 OFF ON OFF OFF

2 2 2Switch LEL 100 ppm H S 50 ppm H S 20 ppm SO

- 23 -

5.5 OFF OFF ON OFF

5.6 OFF ON OFF ON

5.7 OFF OFF ON ON

5.8 OFF OFF OFF OFF

CH1

CONNECTED

CH2

CONNECTED

CH3

CONNECTED

CH4

CONNECTED

LOW ALARM =

20%

HIGH ALARM =

40%

CAL GAS = 50%

45 Sec. POW ER

UP

RELAYS:

Non-latching

Normally

De-energized

CH1 CONNECTED

CH2 CONNECTED

CH3 CONNECTED

CH4 CONNECTED

LOW ALARM =

10PPM

HIGH ALARM =

20PPM

CAL GAS = 50PPM

45 Sec. POW ER UP

RELAYS:

Non-latching

Normally De-energized

CH1 CONNECTED

CH2 CONNECTED

CH3 CONNECTED

CH4 CONNECTED

LOW ALARM =

10PPM

HIGH ALARM =

20PPM

CAL GAS = 20PPM

45 Sec. POW ER UP

RELAYS:

Non-latching

Normally De-

energized

CH1

CONNECTED

CH2

CONNECTED

CH3

CONNECTED

CH4

CONNECTED

LOW ALARM =

5PPM

HIGH ALARM =

10PPM

CAL GAS =

10PPM

45 Sec. POW ER

UP

RELAYS:

Non-latching

Normally De-

energized

Unit III SYSTEM OPERATION

MENU AND FUNCTION SELECTION

The controller has various functions and menus that can be entered by activating the MENU/SET

(and SELECT/RESET) reed switches for a specified amount of time. Table 5 indicates how to

enter the various menus and functions.

Table 5 - Menu and Function Selection

BUTTON TIME FUNCTION OR MENU

SELECT/RESET < 0.5 sec Basic Reset

SELECT/RESET 1 sec Forced Reset

MENU/SET 2 sec Forced Display [FdP]

MENU/SET 5 sec Main Menu

MENU/SET & SELECT/RESET

Simultaneously

20 sec Special Function Menu

Further explanation on how to enter the functions will be given in the following discussion. The

Main Menu has five functions within it (see Table 6) and the Special Function Menu has five

functions (see Table 7).

To enter the Main Menu, activate the MENU/SET reed switch for approximately 5 seconds, until

‘Err Chc’ or ‘SPd’ is displayed, then release it. Once in the Main Menu, the next selection can be

- 24 -

brought up by activating the MENU/SET reed switch. The SELECT/RESET reed switch is used to

accept a currently displayed selection.

Failure to activate any reed switches for a period of 10 seconds will result in the controller

returning to the Normal Operating Mode. Selecting the Return function will also return the

controller to the Normal Operating Mode. W hen ‘rtn’ is on the right digital display, momentarily

activate the SELECT/RESET reed switch.

Summary of Main Menu:

Enter Main Menu: MENU/SET for 5 seconds

Find Desired Function: MENU/SET

Select Function: SELECT/RESET

Next Function: MENU/SET

Exit Main Menu: no buttons for 10 seconds or Select RETURN function

Table 6 - Main Menu Selection

LEFT DIGITAL

DISPLAY

RIGHT DIGITAL

DISPLAY FUNCTION

Chc Err Error Check (hidden if no errors)

blank SPd Set Point Display

blank CAL Calibration

blank SrP Sensor Replacement

blank rtn Return

Table 7 - Special Function Menu Selection

LEFT DIGITAL

DISPLAY

RIGHT DIGITAL

DISPLAY FUNCTION

blank FOP Forced current output

blank CUC Current output calibration

Adr SEt Set network address

blank Chd Channel display

blank bPS Bypass

blank rtn Return

START-UP PROCEDURE

1 Output loads that are normally actuated by the system should be secured.

Remove power from all of the output devices to prevent undesired activation.

2 Check all external wiring for proper connections. Be sure that the sensor has

been wired properly.

3 Before installing the controller, inspect it to verify that it has not been physically

damaged in shipment. Check the dip switches on the controller for proper

programming.

4 Apply power to the system.

NOTE

The controller has a 45 or 90 second delay (as programmed), before beginning normal

operation, after power is applied to the system. During this time the outputs are inhibited,

- 25 -

the Fault LED is illuminated, the left digital display cycles through the active channels, and

the right digital display counts down from 45 or 90. This delay allows time for the sensors

to stabilize before beginning normal operation.

5 Put the controller in the Set-point Display Mode to check the present alarm set-

points and calibration gas concentration. If changes are required, refer to the ‘Dip

Switch Setting’ section of the manual.

6 Calibrate the sensor(s); refer to the Sensor Calibration Procedure.

7 Remove mechanical blocking devices (if used) and restore power to the output

loads.

MAIN MENU SELECTIONS

ERROR CHECK MODE (Err Chc)


problems that could prevent proper system response. As a diagnostic and troubleshooting tool,

identifiable faults are displayed on the digital display during the Error Message Display Mode.

Two types of faults are identified: system faults and channel faults. Table 7 lists the codes and

the corresponding conditions.

If a fault should occur:

- the normally energized fault output is de-energized,

- the Fault LED is illuminated, and

- if no alarm is occurs and the controller is sequentially displaying each sensor input, the message

‘Err’ ‘Fnd’ (left and right displays) will be displayed after each sequence.

To view the fault code, enter the Main Menu and then momentarily activate the SELECT/RESET

reed switch when ‘Err’ is displayed on the right digital display. Next, activate the MENU/SET reed

switch repeatedly; the left digital display will sequentially show:

‘SYS’ - system faults

‘CH1' - channel 1 faults




‘Clr’ - clear faults

NOTE

If no errors exist, this function is hidden and can not be accessed.

To select the fault to be displayed, momentarily activate the SELECT/RESET reed switch when

the required fault is displayed on the left digital display. The left digital display will show the

channel (or system) and the right digital display will show the fault code (for 5 seconds) then move

to the next channel.

NOTE

Faults that affect the actual function of the controller (50, 60, 70, 9X) can impair the ability

of the controller to maintain an alarm output.

All faults automatically reset except the 9X, 20, and 10 faults. After the fault condition has been

corrected, the fault output automatically switches to the normal (energized) state, the DC current

output returns to normal, and the Fault LED turns off. Clearing 9X faults requires removing

- 26 -

operating power from the controller for approximately one second. Clearing 20 and 10 requires a

reset.

CAUTION

The fault detection circuitry does not monitor the operation of external response

equipment or the external wiring to these devices. It is important that these devices be

checked periodically to ensure that they are operational.

SET-POINT DISPLAY MODE (SPd)

1 In this mode, the digital displays sequentially display the low and high alarm and

calibration gas concentration automatically. This function is used to check the

present alarm and calibration gas set-point values.

2 To enter the Set-point Display Mode, enter the Main Menu, activate the

MENU/SET reed switch repeatedly until ‘Spd’ is displayed on the right digital

display, then momentarily activate the SELECT/RESET reed switch.

3 The Low LED goes on, ‘LoA’ is shown on the left digital display, and the low

alarm set-point is shown on the right digital display for 2 seconds.

4 The Low LED goes out, the High LED goes on, ‘HiA’ is shown on the left digital

display, and the high alarm set-point is shown on the right display for 2 seconds.

5 The High LED goes out, the Cal LED goes on, ‘CAL’ is shown on the left display,

and the calibration gas concentration (in percent LEL) is shown on the right

display for 2 seconds.

6 The Cal LED goes out, ‘Adr’ is shown on the left display and the right digital

display shows the communication address for the Digital Communication for 2

seconds. Address setting is not used.

7 Finally, the controller returns to the normal operating mode (it is no longer in the

main menu).

8 If adjustments to the set-points are required, the settings on the programming dip

switches must be changed; Refer to ‘DIP SW ITCH SETTINGS’ in the ‘SYSTEM

INSTALLATIONS’ section of this manual for instructions. W hen the set-point

levels are acceptable, record this information for future reference and proceed to

‘CALIBRATION.’

NOTE



Table 8 - System Status Codes(Chx = Channel number)

- 27 -

STATUS CONDITION WHAT TO DO

E90 Dip Switch Configuration error Check dip switch settings and recycle

power

E91 RAM or processor failure Consult the Factory

E94 Set-point and calibration data lost Consult the Factory

E95 Internal 5 volt supply failure during

start-up

Consult the Factory

E96 External 24 volt supply failure during

start-up

Consult the Factory

E97 EEPROM failure Consult the Factory

E98 Duplicate Communication address Check Communication address and

change to a vacant address

E99 Lost communication Check communication wiring, disconnect

controller, and re-connect it. If this does

not help, contact the factory

CHx E80 Sensor output is more than 26 mA Check wiring and signal output from

sensor

CHx E70 External reset switch has been

activated for 15 seconds or longer. Self

clearing when switch is released.

Check external reset switch for a short,

or faulty operation

CHx E40 Sensor (or transmitter) input failure;

input is below 1 mA

Check wiring and signal output from

sensor

CHx E30 Negative zero drift; sensor (or

transmitter) is -9% full scale or lower

Calibrate transmitter

CHx E20 Time ran out while waiting for the user

to apply gas to the sensor

Restart calibration procedure

CHx E21 Sensor (or transmitter) output is too

low; enough offset to get an accurate

calibration is not being generated.

Calibrate transmitter or replace sensor

CHx E22 Sensor can not be calibrated Calibrate transmitter or replace sensor

CHx E23 Sensor is too sensitive for the detector

to read 100% full scale

Calibrate transmitter or replace sensor

CHx E24 Zero point is more than 6% below

standard value


CHx E25 Zero point is more than 6% above

standard value


CHx E10 Calibration was successful, but sensor

reaching end of life or time to change

jumper position on transmitter

Be prepared to calibrate transmitter or

replace sensor at next calibration time

CHx goP Over-range error (reading greater than

100% of full range)

Ensure area has been de-contaminated

then perform a forced reset

SENSOR CALIBRATION (CAL)

General Information

- 28 -

Various factors affect the interval between periodic calibrations. Exposure to certain contaminants

in the air, accumulation of contaminants on the filter, or an extended period of normal operation

can cause changes in sensitivity. Since each application is different, the length of time between

regularly scheduled calibrations can vary from one installation to the next. In general, the more a

system is checked, the greater the reliability. A calibration must be performed:

- when a new system is initially put into service,

- when the sensor is replaced, or

- when a controller is replaced.

IMPORTANT

To ensure adequate protection, the detection system must be calibrated on a regularly

scheduled basis.

The Controller uses a fully automatic calibration procedure that requires no adjustments by the

operator. The controller performs the zero adjustments, then signals the operator when to apply

and when to remove the calibration gas.

W hile in the Sensor Calibrate Mode, all controller outputs are inhibited, the current output is 3 mA,

and the Cal LED is illuminated.

NOTE

If the sensor is being replaced, refer to the 'Sensor Replacement' section (under

'Maintenance') in this manual for information regarding replacement and calibration of the

sensor.

Calibration Procedure

1 The sensor should be allowed to stabilize for a minimum of 4 hours, although it is

best to allow 24 hours for the sensor to stabilize.

2 Be certain that the controller is properly programmed for the gas concentration

being used for calibration. (Refer to ‘SET-POINT DISPLAY MODE’ to check

programmed value.) Reprogram the controller if required. (Refer to ‘DIP SW ITCH

SETTINGS.’) Failure to do so will greatly impair system response.

NOTE



3 Be sure that only clean air is present at the sensor. The microprocessor begins

taking zero readings immediately upon entering the Calibrate Mode. If the

possibility of background gases exists, purge the sensor with clean air to assure

an accurate calibration.

4 Enter the Main Menu, activate the MENU/SET reed switch repeatedly until ‘CAL’

is shown on the right digital display, then momentarily activate the

SELECT/RESET reed switch.

5 Once in the sensor calibrate mode, the right digital display will continue to show

‘CAL’ and the left digital display will show ‘Chn’. Activate the MENU/SET reed

switch repeatedly until the desired channel is shown on the left digital display,

then momentarily activate the RESET/SELECT reed switch.

- 29 -

6 Once the required channel has been selected, the controller will automatically

start taking zero readings. The left digital display will show ‘Air’ and the right

display will flash a value close to zero. W hen the zero calculations are complete

(30 seconds minimum), the right digital display stops flashing and reads '00'; the

left display will now alternately display ‘gAS’ and ‘in’.

7 Apply the calibration gas to the sensor. The right digital display starts to flash, and

the value indicated on the display rises. The bar graph display also indicates the

level of gas at the sensor, but does not flash. The left display will show ‘gAS’.

8 W hen the microprocessor has completed the gain adjustments (30 seconds

minimum), the right digital display stops flashing and the left display will

alternately display ‘Cut’ and ‘gAS’.

9 Remove the calibration gas. W hen the gas level falls to half the low alarm

set-point, the controller automatically returns to the normal operating mode.

10 If another sensor must be calibrated, return to step 1.

If the operator fails to complete the calibration procedure or if the sensitivity of the sensor has

deteriorated to the extent that calibrations cannot be successfully completed, a calibration fault

(‘E2X’ status) will be generated. The system will automatically revert to the former calibration

settings (after 10 minutes or when the gas level drops below the lowest set-point). If a successful

calibration cannot be accomplished, replace the sensor and calibrate (refer to the

transmitter/sensor manual, as some transmitters will have gain jumpers which need to be

changed and the sensor may still be useful).

If the microprocessor determines that the sensor is approaching the end of its useful life or the

gain jumper on the transmitter needs to be changed, ‘E10' will be indicated on the digital display.

This does not indicate a system malfunction, but is intended to notify the operator of this condition.

A successful calibration can still be performed, but the operator should be prepared to change the

sensor at the time of the next calibration. Activate SELECT/RESET after completing calibration to

clear the display.

SENSOR REPLACEMENT MODE (SrP)

This mode inhibits all controller outputs to allow replacement of the sensor(s) without removing

power from the controller. Alarm set-points and calibration gas concentration are not affected. The

left display will show ‘SrP’ while in the sensor replace mode. The right display will show the status

of the sensor being replaced (‘NoS’ means no sensor is connected). The fault LED is on and the

fault relay is de-energized. The channel LED will be on for the sensor being replaced.

All other sensors remain active during sensor replace mode. If an alarm condition occurs on one

of the active channels while in this mode, the appropriate channel LED will flash and relays will act

accordingly. All other display features will be inhibited. In order to exit this mode the

SELECT/RESET reed switch must be activated. The controller will perform a power-up count

down (45 or 90 seconds) for the replaced sensor, and the affected current output will drop to 1

mA.

SPECIAL FUNCTION MENU SELECTIONS

FORCED CURRENT OUTPUTS (FoP)

- 30 -

The forced current output mode is used to check the current output calibration and the operation

of any devices connected to the current outputs.

To enter the forced current output mode, enter the special function menu. W hen ‘FoP’ is shown

on the right display, activate the SELECT/RESET reed switch. Upon successful entry into this

mode the left display will flash ‘gPn’. Activate the MENU/SET reed switch until the desired area

output is reached (‘GPA’ = Area 1 and ‘GPb’ = Area 2), then activate the SELECT/RESET reed

switch.

W hen an area has been chosen for forced current output, the left display will alternate between

‘GPX’ and ‘FoP’ and the right display will show what type of current output (in gas concentration)

is being placed on the current output line.

The push-button switches are used to change the current output. To exit this function, hold the

SELECT/RESET reed switch down until ‘rtn’ is shown on the right display. Release the reed

switch, and the controller will return to the normal operating mode in 10 seconds if no reed

switches are pushed.

CURRENT CALIBRATION MODE (CuC)

The next selection in the special function menu is the current calibration mode. This mode is

selected to calibrate the current outputs. The Area output to calibrate is chosen as in the Forced

Current Output Mode. Once an area has been selected, the left display will alternate between

‘CuC’ and the area that is being calibrated (‘GPX’). The right display will show a constant which

will rise and fall as the current is adjusted (does not show the current on the outputs). Place a

milliamp meter between the Area current output and system common. Use the magnetic reed

switches to raise and right the current. Once the current measured is as close to 4 mA as

possible, do not activate any reed switches for 10 seconds and the constant shown on the right

display will change to a much higher number. This tells the operator that it is time to calibrate the

higher end of the current output range. Use the magnetic reed switches to bring the current level

as close as possible to 20 mA. Do not activate any reed switches for 10 seconds and the constant

shown on the display will change to a lower number. Now it is time to calibrate the current output

to 3 mA for when the controller is in the calibration mode. Once this current level is set, do not

activate any reed switches for 10 seconds and the controller will return to the normal operating

mode.

ADDRESS SET MODE (Adr Set) (Do not use)

Do not use the next selection in the special function menu. It is the address set mode, used

to set the controllers address for the Digital Communication system. W hen the left display shows

‘Adr’ and the right display shows ‘SEt’ activate the SELECT/RESET reed switch. The left display

will alternate between ‘Adr’ and ‘SEt’ and the right display will show the current address. Use the

magnetic reed switches to raise and lower the address. Once the address is correct, do not

activate any reed switches for 10 seconds and the controller will return to the normal operating

mode.

CHANNEL DISPLAY(Chd)

- 31 -

In this mode, the displays can be forced to monitor only one channel, as long as no alarms are

occurring. If any alarm occurs, the controller will return back to the Normal Operating Mode for the

situation when an alarm is occurring.

Enter the Special Function Menu, activate the MENU/SET reed switch repeatedly until ‘Chd’ is

displayed on the right digital display, then momentarily activate the SELECT/RESET reed switch.

The left digital display will show ‘Chn’. Activate the MENU/SET reed switch repeatedly to toggle

through the channels (CH1, CH2, CH3, or CH4). To select a channel, momentarily activate the

SELECT/RESET reed switch when the required channel is displayed, on the left digital display.

The displays will now only display the information for the chosen channel.

To return to the normal operating mode, enter the manual display mode again and instead of

selecting a single channel, select ‘ALL’.

BYPASS (bPS)

The bypass mode is entered through the special functions menu. Enter the special functions

menu and activate the MENU/SET reed switch repeatedly until ‘bPS’ is shown on the right digital

display, then momentarily activate the SELECT/RESET reed switch. The right digital display will

still show ‘bPS’ and the left display will show ‘gPn’. Select the group to put in bypass mode by

activating the MENU/SET reed switch repeatedly until the desired group is shown, then activate

the SELECT/RESET reed switch momentarily.

W hile in bypass mode, the alarm outputs for the selected group(s) are inhibited. The HIGH alarm

relay is common to both groups, and is inhibited even if the unselected group has an alarm

condition. CAUTION SHOULD BE USED WHILE IN BYPASS MODE.

To exit the bypass mode, activate the SELECT/RESET reed switch momentarily.

OPERATING MODES

RESET MODE

The Reset Function is entered by activating the SELECT/RESET reed switch located on the front

panel of the controller (refer to Figure 2). W hen the SELECT/RESET reed switch is activated

momentarily, all LEDs turn off and all outputs return to their normal condition if no alarms or

faults are occurring.

FORCED RESET MODE

If any channel gets a reading beyond 100% of full scale, a reset will not clear the alarms, even if

the channel has returned to levels below the low alarm set point. The error resulting from this

occurrence must be cleared in the error check mode and then a forced reset must be applied. To

apply a forced reset, activate the SELECT/RESET reed switch for 1 second, the LEDs turn off

and the outputs return to their normal condition. Remote reset performs a forced reset.

NOTE

The remote reset performs a reset function only. It cannot be used for other controller

functions.

NORMAL OPERATING MODE

In the Normal Operating Mode with no alarm:

- 32 -

C The digital and bar graph displays are on and indicate the sensor(s) input(s). If only one

channel is active, then the displays will stay on that channel; if two or more channels are

active, the displays will sequentially display the channels, for 5 seconds each. The left

digital display will indicate the channel (CH1, CH2, CH3, or CH4) and the right digital

display will indicate the sensor reading.

C The Channel LEDs will indicate which channel the digital display is referring to.

C All other LEDs are off.

C Alarm relays are in their normal state, energized or de-energized as programmed.

C Fault relay is energized.

In the Normal Operating Mode with a low alarm(s) condition occurring:

C Digital and bar graph displays indicate the sensor input(s) as outlined above.

C If one channel is in alarm, the system will stay at that channel.

C If more than one channel is in alarm, the channel with the ‘highest’ alarm condition will be

displayed. The channel LED of other channels will flash to notify that an alarm condition

exists. To force the display of a channel with a ‘lower’ alarm, go into the Forced Display

Mode, as outlined in the next section.

C Low LED flashes.

C Low alarm relay changes state.

C Fault relay is energized and fault LED is off.

W hen the signal decreases below the low set-point:

C The digital display and bar graph display continue to track the sensor input.

C W ith latching operation programmed, low alarm relays will not change.

C W ith non-latching operation programmed, low alarm relays will return to their normal

state.

C Low Alarm LEDs are on steady, while the affected channel is displayed, until reset.

If a high alarm condition occurs, the module will be in a Level 3 Display Mode; the bar graph and

digital display will cycle through all channels with a high alarm condition. W hile one channel is

displayed, the channel LED for any other channel in a high or low alarm state will flash.

NOTE

When 1 or more channels are in a high alarm condition and 1 or more channels are in a

low alarm condition, only the channels in the high alarm condition will be cycled on the

display. The channel LED for any channel in the low alarm condition will flash.

If one or more channels reach an ‘over-range’ (>100% of full scale) condition, the error

must be cleared in the error check mode and then a forced reset must be performed once

the channel has returned to normal. A basic reset will not clear an over-range error.

FORCED DISPLAY (FdP)

In the normal operating mode with no alarms occurring, the digital and bar graph displays will

sequentially display each of the channel sensor readings. If an alarm condition occurs, the

displays will remain on the channel with the alarm (or ‘highest’ alarm if more than one channel is

- 33 -

in an alarm condition). In this situation, the forced display mode can be used to temporarily view

the sensor readings of the other channels.

To enter the Forced Display Mode, activate the MENU/SET reed switch for 2 seconds, until the

right digital display shows ‘FdP’. Momentarily activate the SELECT/RESET reed switch to select

this function. The digital displays will then sequentially display each of the active channels once

before automatically returning to the Normal Operating Mode.

Unit IV SYSTEM MAINTENANCE

ROUTINE MAINTENANCE

To ensure reliable protection, it is important to check and calibrate the detection system on a

regularly scheduled basis. The frequency of these checks is determined by the requirements of

the particular installation.

MANUAL CHECK OF OUTPUT DEVICES

Fault detection circuitry continuously monitors for problems that could prevent proper system

response. It does not monitor external response equipment or the wiring to these devices. It is

important that these devices be checked initially when the system is installed and periodically

during the ongoing maintenance program.

SYSTEM CHECK IN NORMAL MODE

The system must be checked periodically in the Normal Operating Mode to ensure that those

items not checked by the controller diagnostic circuitry (such as output relays) are functioning

properly.

**CAUTION**

Be sure to secure all output devices actuated by the system to prevent unwanted acti-

vation of this equipment, and remember to place these same output devices back into

service when the checkout is complete.

SENSOR REPLACEMENT

The area must be declassified or power to the sensor must be removed prior to replacing the

sensor in a hazardous area.

- 34 -

1 Enter the Main Menu; momentarily activate the SELECT/RESET reed switch

once the message ‘SrP’ appears on the right digital display.

2 Once in the sensor replace mode, the right digital display will continue to show

‘SrP’ and the left digital display will show a channel selection: CH1, CH2, CH3, or

CH4.

If the channel that is first displayed corresponds to the senor to be replaced,

momentarily activate the SELECT/RESET reed switch to select that channel. If

the first channel displayed is not the required channel, activate the MENU reed

switch; the left digital display will sequentially display the operational channels

each time the MENU/SET reed switch is activated. Activate the SELECT/RESET

reed switch, once the required channel is displayed.

3 Once the required channel has been selected, the display reads '00' and the

Channel LED and Fault LED are illuminated. The controller is in the Sensor

Replacement Mode.

Once in the Sensor Replacement Mode follow the instructions in the sensor manual for

replacement.

NOTE

If power was removed from the controller during the sensor replacement procedure, the

controller will automatically return to the Normal Mode when power is restored (after a 45

or 90 second time delay). To prevent the possibility of alarms, allow the system to warm

up in the Sensor Replacement Mode.

An adequate supply of spare sensors should be kept on hand for field replacement. For maximum

protection against contamination and deterioration, they should not be removed from the original

protective packaging until the time of installation.

REPLACEMENT PARTS

The Uni-Trol Controller is not designed to be repaired by the customer in the field. If a problem™

should develop, first carefully check for proper wiring, programming and calibration. If it is

determined that the problem is caused by an electronic defect, the device must be returned to the

factory for repair.

NOTE

When replacing a controller, remove power before removing the device from the

enclosure or installing the replacement unit.

The sensor is not intended to be repaired. W hen calibration can no longer be properly performed,

the sensor must be replaced. The frequency of replacement will be determined by the amount and

type of contamination present at the particular installation. An adequate supply of spare sensors

should be kept on hand for field replacement. Always calibrate the sensor after it has been

replaced.

DEVICE REPAIR AND RETURN

How to Return Equipment

- 35 -

A Material Return Authorization number is required in order to return equipment. Please contact

Net Safety Monitoring at (403) 219-0688 before returning equipment or consult our Service

Department to possibly avoid returning equipment.

If you are required to return equipment, include the following information:

1. A Material Return Authorization number (provided over the phone to you by Net Safety).

2. A detailed description of the problem. The more specific you are regarding the problem,

the quicker our Service department can determine and correct the problem.

3. A company name, contact name and telephone number.

4. A Purchase Order, from your company, authorizing repairs or request for quote.

5. Ship all equipment, prepaid to:

Net Safety Monitoring Inc

3rd Floor, 2711 39th Ave., N. E.

Calgary, Alberta, Canada

T1Y 4T8

6. Mark all packages: RETURN for REPAIR

W aybills, for shipments from outside Canada, must state:

Equipment being returned for repair

All charges to be billed to the sender

Also, please ensure a duplicate copy of the packing slip is enclosed inside the box indicating item

1-4 along with the courier and account number for returning the goods.

All Equipment must be Shipped prepaid. Collect shipments will not be accepted.

Pack items to protect them from damage and use anti-static bags or aluminum-backed cardboard

as protection from electrostatic discharge.

- 36 -

TROUBLESHOOTING

Table 9 is intended to serve as an aid in locating the cause of a systemmalfunction. If this table is not helpful, contact an authorized repair person.

Table 9 - Troubleshooting Guide

PROBLEM POSSIBLE CAUSE

No Faceplateindicatorsilluminated

-Wiring to external power source.-Input power failure.

FAULT LED on,digital displayblank

-Power-up time delay (45 seconds).-If condition continues after 45 seconds, repeat power-up. If a problem continues, check dip switches orreplace detector.

E90 to E97 Status -Initialization failure. Repeat power-up. If successful,re-program and re-calibrate. If not, replace detector.

E96 Status -Input power problem. Check operation of powersource and power wiring.

E70 Status -External reset activated for over 15 seconds. Checkexternal switch and wiring.

E40 Status -Sensor input problem. Check sensor and/ortransmitter wiring and calibration.-Faulty sensor. Replace and calibrate.-Faulty transmitter. Replace and calibrate.

E30 Status -Negative zero drift. Calibrate sensor.-Faulty sensor. Replace and calibrate.-Faulty transmitter. Replace and calibrate.

E20, E21 Status -Calibrate error. Re-calibrate.

E22, E23 Status -Sensor sensitivity out of tolerance. Calibratetransmitter. If problem continues, replace sensor andcalibrate.

E10 Status -Sensor reaching end of life - no problem at presenttime. Be prepared to replace sensor at next calibration(calibration attempt might fail).

- 37 -

*Published in Accordance with E1A

standard 471

Appendix A Electrostatic Sensitive Device HandlingProcedure

Electrostatic discharge (ESD) is the transfer, between bodies, of an electrostatic charge caused

by direct contact or induced by an electrostatic field. The most common cause of ESD is physical

contact. Touching an object can cause a discharge of electrostatic energy— ESD! If the charge is

sufficient and occurs near electronic components, it can damage or destroy those components.

In some cases, damage is instantaneous and an immediate malfunction occurs. However,

symptoms are not always immediate—performance may be marginal or seemingly normal for an

indefinite period of time, followed by a sudden failure.

To eliminate potential ESD damage, review the following guidelines:

• Handle boards by metal shields—taking care not to touch electronic components

• W ear grounded wrist or foot straps, or ESD shoes or heel grounders to dissipate

unwanted static energy

• Prior to handling boards, dispel any charge in your body or equipment

• Ensure components are transported and stored in static safe packaging

• W hen returning boards, carefully package in the original carton and static protective

wrapping

• Ensure ALL personnel are educated and trained in ESD Control Procedures

In general, exercise accepted and proven precautions normally observed when handling

electrostatic sensitive devices. A warning label is placed on the packaging, identifying product

using electrostatic sensitive semiconductor devices.

- 38 -

Appendix B Procedure For Activating Reed Switches

When activating the MENU/SET and SELECT/RESET reed switches, it isimportant to orient the magnets provided with the device in the proper direction.They are to be positioned on the faceplate with the curved edge facing the glass.Do not place the flat surface of the magnet against the faceplate. Refer to thediagrams below.

( Do not slide the magnet. Touch it to the glass and then pull away.

- 39 -

Appendix C Record of Dip Switch Settings

DIP SWITCH ON OFF

SW3.1

SW3.2

SW3.3

SW3.4

SW3.5

SW3.6

SW3.7

SW3.8

SW4.1

SW4.2

SW4.3

SW4.4

SW4.5

SW4.6

SW4.7

SW4.8

SW5.1

SW5.2

SW5.3

SW5.4

SW5.5

SW5.6

SW5.7

SW5.8

- 40 -

Appendix D Wire Resistance In Ohms

Distance

(Feet)AWG #20 AWG #18 AWG #16 AWG #14 AWG #12 AWG #10 AWG #8

100 1.02 0.64 0.40 0.25 0.16 0.10 0.06

200 2.03 1.28 0.08 0.51 0.32 0.20 0.13

300 3.05 1.92 1.20 0.76 0.48 0.30 0.19

400 4.06 2.55 1.61 1.01 0.64 0.40 0.25

500 5.08 3.20 2.01 1.26 0.79 0.50 0.31

600 6.09 3.83 2.41 1.52 0.95 0.60 0.38

700 7.11 4.47 2.81 1.77 1.11 0.70 0.44

800 8.12 5.11 3.21 2.02 1.27 0.80 0.50

900 9.14 5.75 3.61 2.27 1.43 0.90 0.57

1000 10.20 6.39 4.02 2.53 1.59 1.09 0.63

1250 12.70 7.99 5.03 3.16 1.99 1.25 0.79

1500 15.20 9.58 6.02 3.79 2.38 1.50 0.94

1750 17.80 11.20 7.03 4.42 2.78 1.75 1.10

2000 20.30 12.80 8.03 5.05 3.18 2.00 1.26

2250 22.80 14.40 9.03 5.68 3.57 2.25 1.41

2500 25.40 16.00 10.00 6.31 3.97 2.50 1.57

3000 30.50 19.20 12.00 7.58 4.76 3.00 1.88

3500 35.50 22.40 14.10 8.84 5.56 3.50 2.21

4000 40.60 25.50 16.10 10.00 6.35 4.00 2.51

4500 45.70 28.70 18.10 11.40 7.15 4.50 2.82

5000 50.10 32.00 20.10 12.60 7.94 5.00 3.14

5500 55.80 35.10 22.10 13.91 8.73 5.50 3.46

6000 61.00 38.30 24.10 15.20 9.53 6.00 3.77

6500 66.00 41.50 26.10 16.40 10.30 6.50 4.08

7000 71.10 44.70 28.10 17.70 11.10 7.00 4.40

7500 76.10 47.90 30.10 19.00 12.00 7.49 4.71

8000 81.20 51.10 23.10 20.20 12.70 7.99 5.03

9000 91.40 57.50 36.10 22.70 14.30 8.99 5.65

10 000 102.00 63.90 40.20 25.30 15.90 9.99 6.28

NOTE: RESISTANCE SHOWN IS ONE WAY. THIS FIGURE SHOULD BEDOUBLED WHEN DETERMINING CLOSED LOOP RESISTANCE.

Distributed By:

2721 Hopewell Place NE Calgary, Alberta, Canada T1Y 7J7Telephone: (403) 219-0688 Fax: (403) 219-0694www.net-safety.comE-mail: [email protected]

http://www.net-safety.com

UNI-TROLTM GAS CONTROLLER - Automation Solutions Rosem… · · 2012-08-23UXG-100-LEL = 0 to 100%...

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Transcript of UNI-TROLTM GAS CONTROLLER - Automation Solutions Rosem… · · 2012-08-23UXG-100-LEL = 0 to 100%...