Identification Letters - 1984 examples

ANSI/ISA-S5.1-1984 (R 1992) 21

Table 1 Identification Letters

NOTE: Numbers in parentheses refer to specific explanatory notes in Section 5.1.

FIRST-LETTER (4) SUCCEEDING-LETTERS (3)

MEASURED OR INITIATING VARIABLE MODIFIER

READOUT OR PASSIVE

FUNCTION OUTPUT FUNCTION MODIFIER

A Analysis (5,19) Alarm

B Burner, Combustion User's Choice (1) User's Choice (1) User's Choice (1)

C User's Choice (1) Control (13)

D User's Choice (1) Differential (4)

E Voltage Sensor (Primary Element)

F Flow Rate Ratio (Fraction) (4)

G User's Choice (1) Glass, Viewing Device (9)

H Hand High (7, 15, 16)

I Current (Electrical) Indicate (10)

J Power Scan (7)

K Time, Time Schedule Time Rate of Change (4, 21)

Control Station (22)

L Level Light (11) Low (7, 15, 16)

M User's Choice (1) Momentary (4) Middle, Intermediate (7,15)

N User's Choice (1) User's Choice (1) User's Choice (1) User's Choice (1)

O User's Choice (1) Orifice, Restriction

P Pressure, Vacuum Point (Test) Connection

Q Quantity Integrate, Totalize (4)

R Radiation Record (17)

S Speed, Frequency Safety (8) Switch (13)

T Temperature Transmit (18)

U Multivariable (6) Multifunction (12) Multifunction (12) Multifunction (12)

V Vibration, Mechanical Analysis (19)

Valve, Damper, Louver (13)

W Weight, Force Well

X Unclassified (2) X Axis Unclassified (2) Unclassified (2) Unclassified (2)

Y Event, State or Presence (20)

Y Axis Relay, Compute, Convert (13, 14, 18)

Z Position, Dimension Z Axis Driver, Actuator, Unclassified Final Control Element

22 ANSI/ISA-S5.1-1984 (R 1992)

Tabl

e 2

T

ypic

al L

ette

r Com

bina

tions

Not

e: T

his

tabl

e is

not

all-

incl

usiv

e.

Oth

er P

ossi

ble

Com

bina

tions

:*A

, ala

rm, t

he a

nnun

ciat

ing

devi

ce, m

ay b

e us

ed in

the

sam

eFO

(Res

trict

ion

Orif

ice)

PFR

(Rat

io)

fash

ion

as S

, sw

itch,

the

actu

atin

g de

vice

.FR

K, H

IK(C

ontro

l Sta

tions

)K

QI

(Run

ning

Tim

e In

dica

tor)

FX(A

cces

sorie

s)Q

QI

(Indi

catin

g C

ount

er)

**Th

e le

tters

H a

nd L

may

be

omitt

ed in

the

unde

fined

cas

e.TJ

R(S

cann

ing

Rec

orde

r)W

KIC

(Rat

e-of

-Wei

ght-L

oss

Con

trolle

r)LL

H(P

ilot L

ight

)H

MS

(Han

d M

omen

tary

Sw

itch)

Firs

t-Le

tters

Initi

atin

g or

M

easu

red

Vaia

ble

Con

trol

lers

Rea

dout

Dev

ices

Switc

hes

and

Ala

rm D

evic

es*

Tran

smitt

ers

Sole

noid

s,

Rel

ays,

C

ompu

ting

Dev

ices

Prim

ary

Elem

ent

Test

Po

int

Wel

l or

Pr

obe

View

ing

Dev

ice,

G

lass

Safe

ty

Dev

ice

Fina

l El

emen

tR

ecor

ding

Indi

catin

gB

lind

Self-

Act

uate

d C

ontro

l Va

lves

Rec

ordi

ng

Indi

catin

gH

igh*

*Lo

wC

omb

Rec

ordi

ngIn

dica

ting

Blin

dA

Ana

lysi

sAR

CA

ICAC

AR

AI

ASH

ASL

ASH

LA

RT

AIT

ATAY

AEA

PAW

AV

BB

urne

r/Com

bust

ion

BRC

BIC

BCB

RB

IBS

HBS

LBS

HL

BR

TB

ITBT

BY

BEBW

BGBZ

CU

sers

Cho

ice

DU

sers

Cho

ice

EVo

ltage

ERC

EIC

ECE

RE

IES

HES

LES

HL

ER

TE

ITET

EY

EEEZ

FFl

ow R

ate

FRC

FIC

FCFC

V,FI

CV

FRFI

FSH

FSL

FSH

LFR

TFI

TFT

FYFE

FPFG

FV

FQFl

ow Q

uant

ityFQ

RC

FQIC

FQR

FQI

FQS

HFQ

SL

FQIT

FQT

FQY

FQE

FQV

FFFl

ow R

atio

FFR

CFF

ICFF

CFF

RFF

IFF

SH

FFS

LFE

FFV

GU

sers

Cho

ice

HH

and

HIC

HC

HS

HV

IC

urre

ntIR

CIIC

IRII

ISH

ISL

ISH

LIR

TIIT

ITIY

IEIZ

JPo

wer

JRC

JIC

JRJI

JSH

JSL

JSH

LJR

TJI

TJT

JYJE

JV

KTi

me

KRC

KIC

KCK

CV

KR

KI

KSH

KSL

KSH

LK

RT

KIT

KTK

YKE

KV

LLe

vel

LRC

LIC

LCLC

VLR

LILS

HLS

LLS

HL

LRT

LIT

LTLY

LELW

LGLV

MU

sers

Cho

ice

NU

sers

Cho

ice

OU

sers

Cho

ice

PP

ress

ure/

Va

cuum

PRC

PIC

PCP

CV

PR

PI

PSH

PSL

PSH

LP

RT

PIT

PTP

YPE

PP

PS

V,P

SE

PV

PD

Pre

ssur

e,

Diff

eren

tial

PDR

CP

DIC

PDC

PD

CV

PD

RP

DI

PD

SH

PDS

LP

DR

TP

DIT

PDT

PDY

PEP

PP

DV

QQ

uant

ityQ

RC

QIC

QR

QI

QSH

QSL

QSH

LQ

RT

QIT

QT

QY

QE

QZ

RR

adia

tion

RR

CR

ICR

CR

RR

IR

SH

RS

LR

SH

LR

RT

RIT

RT

RY

RE

RW

RZ

SS

peed

/Fre

quen

cySR

CS

ICSC

SC

VS

RS

ISS

HSS

LSS

HL

SR

TS

ITST

SY

SES

VT

Tem

pera

ture

TRC

TIC

TCTC

VTR

TITS

HTS

LTS

HL

TRT

TIT

TTTY

TETP

TWTS

ETV

TDTe

mpe

ratu

re,

D

iffer

entia

lTD

RC

TDIC

TDC

TDC

VTD

RTD

ITD

SH

TDSL

TDR

TTD

ITTD

TTD

YTE

TPTW

TDV

UM

ultiv

aria

ble

UR

UI

UY

UV

VV

ibra

tion/

Mac

hine

ry

Ana

lysi

sV

RV

IVS

HVS

LVS

HL

VR

TV

ITVT

VY

VEVZ

WW

eigh

t/For

ceW

RC

WIC

WC

WC

VW

RW

IW

SHW

SLW

SHL

WR

TW

ITW

TW

YW

EW

Z

WD

Wei

ght/F

orce

,

Diff

eren

tial

WD

RC

WD

ICW

DC

WD

CV

WD

RW

DI

WD

SHW

DSL

WD

RT

WD

ITW

DT

WDY

WE

WD

Z

XU

ncla

ssifi

edY

Eve

nt/S

tate

/Pre

senc

eY

ICYC

YR

YI

YSH

YSL

YTY

YYE

YZ

ZPo

sitio

n/D

imen

sion

ZRC

ZIC

ZCZC

VZR

ZIZS

HZS

LZS

HL

ZRT

ZIT

ZTZY

ZEZV

ZDG

augi

ng/D

evia

tion

ZDR

CZD

ICZD

CZD

CV

ZDR

ZDI

ZDS

HZD

SLZD

RT

ZDIT

ZDT

ZDY

ZDE

ZDV

5.3

ANSI/ISA-S5.1-1984 (R 1992) 23

Tabl

e 3

F

unct

ion

Blo

cks

- Fun

ctio

n D

esig

natio

nsTH

E F

UN

CTI

ON

DE

SIG

NAT

ION

S A

SS

OC

IATE

D W

ITH

CO

NTR

OLL

ER

S, C

OM

PU

TIN

G D

EV

ICE

S, C

ON

VE

RTE

RS

AN

D

RE

LAY

S M

AY B

E U

SE

D IN

DIV

IDU

ALL

Y O

R IN

CO

MB

INAT

ION

(ALS

O, S

EE

TA

BLE

1, N

OTE

14.

). TH

E U

SE

OF

A BO

X AV

OID

S C

ON

FUS

ION

BY

SE

TTIN

G O

FF T

HE

SYM

BOL

FRO

M O

THE

R M

AR

KIN

GS

ON

A D

IAG

RA

M

AN

D P

ER

MIT

S T

HE

FU

NC

TIO

N T

O B

E U

SE

D A

S A

STA

ND

-ALO

NE

BLO

CK

ON

CO

NC

EP

TUA

L D

ES

IGN

S.

5.4

24 ANSI/ISA-S5.1-1984 (R 1992)

5.4

Tabl

e 3

C

ontin

ued

ANSI/ISA-S5.1-1984 (R 1992) 25

5.4

Tabl

e 3

C

ontin

ued

26 ANSI/ISA-S5.1-1984 (R 1992)

5.4

Tabl

e 3

C

ontin

ued

ANSI/ISA-S5.1-1984 (R 1992) 27

6 Drawings

6.1 Cautionary notes

1) If a given drawing, or set of drawings, uses graphic symbols that are similar or identical in shape or configuration and that have different meanings because they are taken from different standards, then adequate steps must be taken to avoid misinterpretation of the symbols used. These steps may be to use caution notes, reference notes, comparison charts that illustrate and define the conflicting symbols, or other suitablemeans. This requirement is especially critical in cases where symbols taken from different disciplines are intermixed and their misinterpretation might cause danger to personnel or damage to equipment.

2) The titles Simplified Diagrams, Conceptual Diagrams and Detailed Diagrams of Section 6.12 were chosen to represent a cross section of symbol usage, not any particular generic document. (See 4.4.10 for a more complete discussion.)

3) The line symbols of Section 6.2 offer "user's choice" alternative electrical symbols and optional binary symbols. The subsequent examples use one consistent set of these alternatives and apply the binary options. This was done for consistency of appearance of the standard.

It is recommended that the user choose either the dashed line electrical symbol orthe triple cross hatch symbol and apply it consistently. The optional binary (on-off)symbols are available for those applications where the user finds it necessary todistinguish between analog and binary signals. If, in the user's judgment, the ap-plication does not require such differentiation, the reverse slash may be omittedfrom on-off signal line symbols. Consistency is recommended on a given set ofdocuments.

28 ANSI/ISA-S5.1-1984 (R 1992)

6.2 Instrument line symbolsALL LINES TO BE FINE IN RELATION TO PROCESS PIPING LINES.

ANSI/ISA-S5.1-1984 (R 1992) 29

6.3 General instrument or function symbols

30 ANSI/ISA-S5.1-1984 (R 1992)

6.3 General instrument or function symbols (contd.)

ANSI/ISA-S5.1-1984 (R 1992) 31

6.4 Control valve body symbols, damper symbols

32 ANSI/ISA-S5.1-1984 (R 1992)

6.5 Actuator symbols

ANSI/ISA-S5.1-1984 (R 1992) 33

6.5 Actuator symbols (contd.)

34 ANSI/ISA-S5.1-1984 (R 1992)

6.6 Symbols for self-actuated regulators, valves, and other devices

ANSI/ISA-S5.1-1984 (R 1992) 35

6.6 Symbols for self-actuated regulators, valves, and other devices (contd.)

36 ANSI/ISA-S5.1-1984 (R 1992)

6.6 Symbols for self-actuated regulators, valves, and other devices (contd.)

ANSI/ISA-S5.1-1984 (R 1992) 37

6.7 Symbols for actuator action in event of actuator power failure (shown typically for diaphragm-actuated control valve).

38 ANSI/ISA-S5.1-1984 (R 1992)

6.8 Primary element symbols

ANSI/ISA-S5.1-1984 (R 1992) 39

6.8 Primary element symbols (contd.)

40 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 41


42 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 43


44 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 45


46 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 47


48 ANSI/ISA-S5.1-1984 (R 1992)

6.9 Examples functions

ANSI/ISA-S5.1-1984 (R 1992) 49

6.9 Examples functions (contd.)

50 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 51


52 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 53


54 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 55


56 ANSI/ISA-S5.1-1984 (R 1992)

6.10 Examples miscellaneous combinations

ANSI/ISA-S5.1-1984 (R 1992) 57

6.10 Examples miscellaneous combinations (contd.)

58 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 59


60 ANSI/ISA-S5.1-1984 (R 1992)


ANSI/ISA-S5.1-1984 (R 1992) 61

6.11 Example complex combinations

62 ANSI/ISA-S5.1-1984 (R 1992)

6.12 Example degree of detail*

ANSI/ISA-S5.1-1984 (R 1992) 63

6.12 Example degree of detail (contd.)*

64 ANSI/ISA-S5.1-1984 (R 1992)

6.12 Example degree of detail (contd.)*

Identification Letters - 1984 examples

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