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Instrument Abbreviations Used in Instrumentation Diagrams (P&IDs) III

To further understand instrument abbreviations used in instrumentation and process diagrams, we have presented more examples of the common combinations of instrument abbreviations you may likely come across. They include abbreviations for switches and alarm devices, transmitters, solenoids, relays, computing devices, primary elements, test points, well or probe, viewing devices e.g glass, safety devices as well as final elements. 

The main objective of bringing many possible combinations of these process instruments is to drive home the understanding of how they are formed such that once you see them being used in a process or instrumentation diagram or even conceptual or flow diagrams, you will immediately be in a position to identify them and know what they are being used for.

First Letters

Initiating,  Measured, Variable

Switches & Alarm Devices*

Transmitters

Solenoids, Relays, Computing Devices

Primary Element

Test Point

Well or Probe

Viewing Device, Glass

Safety Device

Final Element

High**

Low

Comb

Recording

Indicating

Blind

A

Analysis

ASH

ASL

ASHL

ART

AIT

AT

AY

AE

AP

AW

AV

B

Burner/ Combustion

BSH

BSL

BSHL

BRT

BIT

BT

BY

BE

BW

BG

BZ

C

User's Choice

D

User's Choice

E

Voltage

ESH

ESL

ESHL

ERT

EIT

ET

EY

EE

EZ

F

Flow Rate

FSH

FSL

FSHL

FRT

FIT

FT

FY

FE

FP

FG

FV

FQ

Flow Quantity

FQSH

FQSL

FQIT

FQT

FQY

FQE

FQV

FF

Flow Ratio

FFSH

FFSL

FE

G

User's Choice

H

Hand

HS

HV

I

Current

ISH

ISL

ISHL

IRT

IIT

IT

IY

IE

IZ

J

Power

JSH

JSL

JSHL

JRT

JIT

JT

JY

JE

JV

K

Time

KSH

KSL

Cell

KSHL

KIT

KT

KY

KE

KV

L

Level

LSH

LSL

LSHL

LRT

LIT

LT

LY

LE

LW

LG

LV

M

User's Choice

N

User's Choice

O

User's Choice

P

Pressure/ Vaccum

PSH

PSL

PSHL

PRT

PIT

PT

PY

PE

PP

PSV, PSE

PV

PD

Pressure, Differential

PDSH

PDSL

PDRT

PDIT

PDT

PDY

PE

PP

PDV

Q

Quantity

QSH

QSL

QSHL

QRT

QIT

QT

QE

QZ

R

Radiation

RSH

RSL

RSHL

RRT

RIT

RT

RY

RE

RW

RZ

S

Speed/ Frequency

SSH

SSL

SSHL

SRT

SIT

ST

SY

SE

SV

T

Temperature

TSH

TSL

TSHL

TRT

TIT

TT

TY

TE

TP

TW

TSE

TV

TD

Temperature, Differential

TDSH

TDSL

TDRT

TDIT

TDT

TDY

TE

TP

TW

TDV

U

Multivaraible

UY

UV

V

Vibration/ Machinery Analysis

VSH

VSL

VSHL

VRT

VIT

VT

VY

VE

VZ

W

Weight/ Force

WSH

WSL

WSHL

WRT

WIT

WT

WY

WE

WZ

WD

Weight/ Force, Differential

WDSH

WDSL

WDRT

WDIT

WDT

WDY

WE

WDZ

X

Unclassified

Y

Event/State/ Presence

YSH

YSL

YY

YE

YZ

Z

Position/ Dimension

ZSH

ZSL

ZSHL

ZRT

ZIT

ZT

ZY

ZE

ZV

ZD

Gauging/ Deviation

ZDSH

ZDSL

ZDRT

ZDIT

ZDT

ZDY

ZDE

ZDV

*A, Alarm, the annuciating device, may be used in the same way as S, switch, the switching device.

** The letters H and L may be omitted in the undefined case.

The table above is a guide. It does not cover all possible combinations of  instrument abbreviations that one may encounter in the process industry.

Note that apart from the combinations above, there are some other possible combinations when it comes to instrument abbreviations. Some combinations which might not be common in your process plant are shown in the table below:

Instrument Abbreviation	Meaning or Designation Used to Qualify Instrument
FO	Restriction Orifice
FRK, HIK	Control Stations
FX	Accessories
TJR	Scanning Recorder
LLH	Pilot Light
PFR	Ratio
KQI	Running Time Indicator
QQI	Indicating Counter
WKIC	Rate-of-Weight-Loss Controller
HMS	Hand Momentary Switch

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