Instrument Abbreviations

Instrument Abbreviations

From Piping-Designer

This list by no means is complete, also see Instrument Tag for more.

A

Term DefinitionAH Alarm High

AI Alarm Indicator

AL Alarm Low

AO Analog Output

AAH Analyzer Alarm High

AAL Analyzer Alarm Low

AE Analyzer Element

AT Analyzer Transmitter

ATM Atmosphere

B

Term DefinitionB Burner/Flame

BDV Blow Down Valve

C

Term DefinitionCSC Car Seal Closed

CSO Car Seal Open

CAH Conductivity Alarm High

CAL Conductivity Alarm Low

CE Conductivity Element

CIT Conductivity Indicating Transmitter

CS Conductivity Switch (Control)

CSH Conductivity Shutdown High

CSL Conductivity Shutdown Low

CSRV Conventional Safety Relief Valve

D

Term DefinitionDE Density Element

DI Digital Input

DO Digital Output

DPAH Differential Pressure Alarm High

DPAL Differential Pressure Alarm Low

DPI Differential Pressure Indicator

DPIC Differential Pressure Indicator Controller

DPS Differential Pressure Switch (Control)

DPSH Differential Pressure Shutdown High

DPSL Differential Pressure Shutdown Low

DR Density Recorder

DT Density Transmitter

DTT Differential Temperature Transmitter

E

Term DefinitionESD Emergency Shutdown

F

Term DefinitionFA Fire Alarm

FA Flame Arrestor

FAH Flow Alarm High

FAL Flow Alarm Low

FC Fail Closed

FC Flow Controller

FCV Flow Control Valve

FE Flow Element

FI Flow Indicator

FIC Flow Indicating Controller

FIT Flow Indicating Transmitter

FM Flow Meter

FO Flow Orifice

FQI Flow Totalizing Indicator

FQIC Flow Totalizing Indicator Controller

FQIT Flow Totalizing Indicator Transmitter

FR Flow Recorder

FRC Flow Recorder Controller

FSG Flow Sight Glass

FS Flow Switch (Control)

FSH Flow Switch High

FSL Flow Switch Low

FSV Flow Safety Valve (Check Valve)

FT Flow Transmitter

FY Flow Computer

FZ Senior Orifice Fitting

G

Term DefinitionGDE Gas Detector Element

GOXE H2S Detector Element

H

Term DefinitionHOA Hand-Off-Automatic Selector Switch

HSY High Select Relay

HOA Hydraulic Operated Valve

L

Term DefinitionL Level

LAH Level Alarm High

LAHI Level Alarm High Interface

LAL Level Alarm Low

LC Level Controller

LCI Level Controller Interface

LCV Level Control Valve

LCVI Level Control Valve Interface

LD Level Differential

LE Level Element

LEI Level Element Interface

LG Level Glass (Gauge)

LI Level Indicator

LIC Level Indicator Controller

LICI Level Indicator Controller Interface

LIT Level Indicator Transmitter

LS Level Switch (Control)

LSH Level Shutdown High

LSHI Level Shutdown High Indicator

LSL Level Shutdown Low

LSLI Level Shutdown Low Indicator

LSY Level Select Relay

LSH Level Switch High

LSHH Level Switch High High

LSH/L Level Switch High/Low

LSL Level Switch Low

LSLL Level Switch Low Low

LT Level Transmitter

LTI Level Transmitter Interface

LL Liquid Level

LLC Liquid Level Controller

LLG Liquid Level Gauge

LC Lock Closed

LO Lock Open

N

Term DefinitionNOC Net Oil Computer

P

Term DefinitionPAH Pressure Alarm High

PAL Pressure Alarm Low

PC Pressure Controller

PCV Pressure Control Valve

PDAH Pressure Differential Alarm High

PDI Pressure Differential Indicator

PDSH Pressure Differential Switch High

PDR Pressure Differential Recorder

PDT Pressure Differential Transmitter

PI Pressure Indicator

PIC Pressure Indicator Controller

PIT Pressure Indicator Transmitter

PR Pressure Recorder

PRC Pressure Recording Controller

PRV Pressure Relief Valve

PSE Pressure Safety Element (Rupture Disk)

PSH Pressure Shutdown High

PSL Pressure Shutdown Low

PS Pressure Switch (Control)

PSL Pressure Switch Low

PSLL Pressure Switch Low Low

PSV Pressure Safety Valve (Relief Valve)

PT Pressure Transmitter

PV Pressure Valve

PLC Programmable Logic Controller

R

Term DefinitionR Recorder

RTD Resistance Temperature Detector

RO Restriction Orifice

RV Relief Valve

S

Term DefinitionS Switch

SAH Speed Alarm High

SC Speed Controller

SD Shutdown (Unit)

SDV Shutdown Valve

SLO Station Lock Out

SRV Safety Relief Valve

SP Set Point

SH Switch High

SL Switch Low

SP Spare

SSH Speed Shutdown High

SSSV Subsurface Shutdown Valve

SSV Surface Safety Valve

SOV Solenoid Operated Valve

T

Term DefinitionT Transmitter

TAH Temperature Alarm High

TAHH Temperature Alarm High High

TAH/L Temperature Alarm High/Low

TAL Temperature Alarm Low

TC Temperature Controller

TCV Temperature Control Valve

TD Temperature Differential

TE Temperature Element

TI Temperature Indicator

TIC Temperature Indicating Controller

TIT Temperature Indicating Transmitter

TIS Temperature Indicator Switch

TISH/L Temperature Indicator Switch High/Low

TR Temperature Recorder

TRC Temperature Recording Controller

TRS Temperature Recorder Switch

TS Temperature Switch (Control)

TSH Temperature Switch High

TSHH Temperature Switch High High

TSL Temperature Switch Low

TSE Temperature Safety Element (Fusible Plug)

TSH Temperature Shutdown High

TSL Temperature Shutdown Low

TT Temperature Transmitter

TW Thermowell

U

Term DefinitionULO Unit Lock Out

USD Unit Shut Down

UVD Ultra-Violet Detector (Fire)

V

Term DefinitionV Vent

VAH Vibration Alarm High

VAHH Vibration Alarm High High

VB Vacuum Breaker

VFD Variable Frequency Drive

VS Vibration Switch (Control)

VSH Vibration Shutdown High

VT Vibration Transmitter

X

Term DefinitionXE Erosion Element

XSH Seismic Acceleration Switch High

Y

Term DefinitionYI Pump Motor Status (Pump Running)

Z

Term DefinitionZI Position Indicator

ZIO Valve Motor Operator Open Indicator

ZIX Valve Motor Operator Remote Control Indicator

ZSX Valve Motor Operator Remote Control Switch

ZSC Valve Motor Operator Closed Switch

ZSO Valve Motor Operator Open Switch

ZS Position Switch