Instrument Abbreviations

Written by Jerry Ratzlaff. Posted in Instrumentation

Typically instrument abbreviations consist of two parts. The first letter indicates the process. The second letter or two letters indicates the function. Sometimes a third letter is used to indicates additional measured variables. These letters identify the instrumentation process and are displayed in a instrument bubble consisting of two parts. The top half of the bubble represents the process and the bottom half the tag number.

A

  • AAH - Analyzer Alarm High
  • AAL - Analyzer Alarm Low
  • AC - Analyzer Controller
  • AE - Analyzer Element
  • AH - Alarm High
  • AI - Alarm Indicator
  • AI - Analyzer Indicator
  • AIC - Analyzer Indicator Controller
  • AIT - Analyzer Indicator Transmitter
  • AL - Alarm Low
  • AO - Analog Output
  • AOJ - Auto-Off-Jog Selector Switch
  • AP - Analyzer Test Point
  • AR - Analyzer Recorder
  • ARC - Analyzer Recorder Controller
  • ART - Analyzer Recorder Transmitter
  • ASH - Analyzer Switch High
  • ASHL - Analyzer Switch High Low
  • ASL - Analyzer Switch Low
  • AT - Analyzer Transmitter
  • ATM - Atmosphere
  • AY - Analyzer Computer
  • AW - Analyzer Probe
  • AWT - Automatic Well Test

B

  • B - Burner
  • BC - Burner Controller
  • BDV - Blow Down Valve
  • BE - Burner Element
  • BG - Burner Glass
  • BI - Burner Indicator
  • BIC - Burner Indicator Controller
  • BIT - Burner Indicator Transmitter
  • BPV - Back Pressure Valve
  • BR - Burner Recorder
  • BRC - Burner Recorder Controller
  • BRT - Burner Recorder Transmitter
  • BSH - Burner Switch High
  • BSHL - Burner Switch High Low
  • BSL - Burner Switch Low
  • BT - Burner Transmitter
  • BW - Burner Probe
  • BY - Burner Computer

C

  • CAH - Conductivity Alarm High
  • CAL - Conductivity Alarm Low
  • CC - Corrosion Coupon
  • CE - Conductivity Element
  • CIT - Conductivity Indicating Transmitter
  • CP - Cut Probe
  • CS - Car Seal
  • CSC - Car Seal Closed
  • CSO - Car Seal Open
  • CS - Conductivity Switch
  • CSH - Conductivity Shutdown High
  • CSL - Conductivity Shutdown Low

D

  • DE - Density Element
  • DR - Density Recorder
  • DT - Density Transmitter
  • DPSH - Differential Pressure Shutdown High
  • DPSL - Differential Pressure Shutdown Low
  • DTT - Differential Temperature Transmitter
  • DI - Discrete Input (Digital Input)
  • DO - Discrete Output (Digital Output)

E

  • ESD - Emergency Shutdown
  • EY - Voltage Computer
  • EC - Voltage Controller
  • EE - Voltage Element
  • EI - Voltage Indicator
  • EIC - Voltage Indicator Controller
  • EIT - Voltage Indicator Transmitter
  • ER - Voltage Recorder
  • ERC - Voltage Recorder Controller
  • ERT - Voltage Recorder Transmitter
  • ESH - Voltage Switch High
  • ESHL - Voltage Switch High Low
  • ESL - Voltage Switch Low
  • ET - Voltage Transmitter

F

  • FC - Fail Closed
  • FO - Fail Open
  • FP - Fail Position
  • FA - Fire Alarm
  • FA - Flame Arrestor
  • F - Flow
  • FY - Flow Computer
  • FCV - Flow Control Valve
  • FC - Flow Controller
  • FE - Flow Element
  • FG - Flow Glass
  • FI - Flow Indicator
  • FIC - Flow Indicator Controller
  • FIT - Flow Indicator Transmitter
  • FM - Flow Meter
  • FO - Flow Orifice
  • FQY - Flow Quantity Computer
  • FQE - Flow Quantity Element
  • FQI - Flow Quantity Indicator
  • FQIC - Flow Quantity Indicator Controller
  • FQIT - Flow Quantity Indicator Transmitter
  • FQR - Flow Quantity Recorder
  • FQRC - Flow Quantity Recorder Controller
  • FQSH - Flow Quantity Switch High
  • FQSL - Flow Quantity Switch Low
  • FQT - Flow Quantity Transmitter
  • FFC - Flow Ratio Controller
  • FFI - Flow Ratio Indicator
  • FFIC - Flow Ratio Indicator Controller
  • FFR - Flow Ratio Recorder
  • FFRC - Flow Ratio Recorder Controller
  • FFSH - Flow Ratio Switch High
  • FFSL - Flow Ratio Switch Low
  • FR - Flow Recorder
  • FRC - Flow Recorder Controller
  • FRT - Flow Recorder Transmitter
  • FSV - Flow Safety Valve
  • FS - Flow Switch
  • FP - Flow Test Point
  • FT - Flow Transmitter

G

  • GDE - Gas Detector Element

H

  • HC - Hand Controller
  • HIC - Hand Indicator Controller
  • HS - Hand Switch
  • HOA - Hand-Off-Automatic Selector Switch

I

  • IY - Current Computer
  • IE - Current Element
  • II - Current Indicator
  • IIC - Current Indicator Controller
  • IIT - Current Indicator Transmitter
  • IR - Current Recorder
  • IRC - Current Recorder Controller
  • IRT - Current Recorder Transmitter
  • ISH - Current Switch High
  • ISHL - Current Switch High Low
  • ISL - Current Switch Low
  • IT - Current Transmitter
  • IA - Instrument Air

J

  • JY - Power Computer
  • JE - Power Element
  • JI - Power Indicator
  • JIC - Power Indicator Controller
  • JIT - Power Indicator Transmitter
  • JR - Power Recorder
  • JRC - Power Recorder Controller
  • JRT - Power Recorder Transmitter
  • JSH - Power Switch High
  • JSHL - Power Switch High Low
  • JSL - Power Switch Low
  • JT - Power Transmitter

K

  • KY - Time Computer
  • KCV - Time Control Valve
  • KC - Time Controller
  • KE - Time Element
  • KI - Time Indicator
  • KIC - Time Indicator Controller
  • KIT - Time Indicator Transmitter
  • KR - Time Recorder
  • KRC - Time Recorder Controller
  • KRT - Time Recorder Transmitter
  • KSH - Time Switch High
  • KSHL - Time Switch High Low
  • KSL - Time Switch Low
  • KT - Time Transmitter

L

  • LACT - Lease Automatic Custody Transfer
  • L - Level
  • LAD - Level Alarm Device
  • LAHI - Level Alarm High Interface
  • LY - Level Computer
  • LCV - Level Control Valve
  • LCVI - Level Control Valve Interface
  • LC - Level Controller
  • LCI - Level Controller Interface
  • LD - Level Differential
  • LE - Level Element
  • LEI - Level Element Interface
  • LG - Level Glass
  • LI - Level Indicator
  • LIC - Level Indicator Controller
  • LICI - Level Indicator Controller Interface
  • LIT - Level Indicator Transmitter
  • LP - Level Probe
  • LR - Level Recorder
  • LRC - Level Recorder Controller
  • LRT - Level Recorder Transmitter
  • LSHI - Level Shutdown High Indicator
  • LSL - Level Shutdown Low
  • LSLI - Level Shutdown Low Indicator
  • LS - Level Switch
  • LSHH - Level Switch High High
  • 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

  • NOC - Net Oil Computer
  • NC - Normally Closed
  • NO - Normally Open

O

  • OWD - Oil Water Detector
  • OM - Orifice Meter

 P

  • PAD - Pressure Alarm Device
  • PY - Pressure Computer
  • PCV - Pressure Control Valve
  • PC - Pressure Controller
  • PDAH - Pressure Differential Alarm High
  • PDY - Pressure Differential Computer
  • PDCV - Pressure Differential Control Valve
  • PDC - Pressure Differential Controller
  • PDI - Pressure Differential Indicator
  • PDIC - Pressure Differential Indicator Controller
  • PDIT - Pressure Differential Indicator Transmitter
  • PDR - Pressure Differential Recorder
  • PDRC - Pressure Differential Recorder Controller
  • PDRT - Pressure Differential Recorder Transmitter
  • PDS - Pressure Differential Switch
  • PDSH - Pressure Differential Switch High
  • PDSL - Pressure Differential Switch Low
  • PDT - Pressure Differential Transmitter
  • PE - Pressure Element
  • PIT - Pressure Indicating Transmitter
  • PI - Pressure Indicator
  • PIC - Pressure Indicator Controller
  • PR - Pressure Recorder
  • PRC - Pressure Recorder Controller
  • PRT - Pressure Recorder Transmitter
  • PSE - Pressure Safety Element
  • PSV - Pressure Safety Valve
  • PSH - Pressure Shutdown High
  • PSL - Pressure Shutdown Low
  • PS - Pressure Switch
  • PP - Pressure Test Point
  • PT - Pressure Transmitter
  • PV - Pressure Valve
  • PLC - Programmable Logic Controller

Q

  • QY - Quantity Computer
  • QE - Quantity Element
  • QI - Quantity Indicator
  • QIC - Quantity Indicator Controller
  • QIT - Quantity Indicator Transmitter
  • QR - Quantity Recorder
  • QRC - Quantity Recorder Controller
  • QRT - Quantity Recorder Transmitter
  • QSH - Quantity Switch High
  • QSHL - Quantity Switch High Low
  • QSL - Quantity Switch Low
  • QT - Quantity Transmitter

R

  • RY - Radiation Computer
  • RC - Radiation Controller
  • RE - Radiation Element
  • RI - Radiation Indicator
  • RIC - Radiation Indicator Controller
  • RIT - Radiation Indicator Transmitter
  • RW - Radiation Probe
  • RR - Radiation Recorder
  • RRC - Radiation Recorder Controller
  • RRT - Radiation Recorder Transmitter
  • RSH - Radiation Switch High
  • RSHL - Radiation Switch High Low
  • RSL - Radiation Switch Low
  • RT - Radiation Transmitter
  • R - Recorder
  • RTD - Resistance Temperature Detector
  • RO - Restriction Orifice

S

  • SRV - Safety Relief Valve
  • SP - Set Point
  • SD - Shutdown
  • SDV - Shutdown Valve
  • SP - Spare
  • SAH - Speed Alarm High
  • SY - Speed Computer
  • SCV - Speed Control Valve
  • SC - Speed Controller
  • SE - Speed Frequency Element
  • SI - Speed Indicator
  • SIC - Speed Indicator Controller
  • SIT - Speed Indicator Transmitter
  • SR - Speed Recorder
  • SRC - Speed Recorder Controller
  • SRT - Speed Recorder Transmitter
  • SSH - Speed Switch High
  • SSHL - Speed Switch High Low
  • SSL - Speed Switch Low
  • ST - Speed Transmitter
  • SLO - Station Lock Out
  • SSV - Surface Safety Valve
  • S - Switch

T

  • TY - Temperature Computer
  • TCV - Temperature Control Valve
  • TC - Temperature Controller
  • TDI - Temperature Differemtial Indicator
  • TDR - Temperature Differemtial Recorder
  • TD - Temperature Differential
  • TDY - Temperature Differential Computer
  • TDCV - Temperature Differential Control Valve
  • TDC - Temperature Differential Controller
  • TDIC - Temperature Differential Indicator Controller
  • TDIT - Temperature Differential Indicator Transmitter
  • TDRC - Temperature Differential Recorder Controller
  • TDRT - Temperature Differential Recorder Transmitter
  • TDT - Temperature Differential Transmitter
  • TE - Temperature Element
  • TI - Temperature Indicator
  • TIC - Temperature Indicator Controller
  • TIS - Temperature Indicator Switch
  • TISHL - Temperature Indicator Switch High Low
  • TIT - Temperature Indicator Transmitter
  • TP - Temperature Probe
  • TR - Temperature Recorder
  • TRC - Temperature Recorder Controller
  • TRS - Temperature Recorder Switch
  • TRT - Temperature Recorder Transmitter
  • TSE - Temperature Safety Element
  • TS - Temperature Switch
  • TP - Temperature Test Point
  • TT - Temperature Transmitter
  • TW - Thermowell
  • T - Transmitter

U

  • UY - Multivariable Computer
  • UI - Multivariable Indicator
  • UR - Multivariable Recorder
  • ULO - Unit Lock Out
  • USD - Unit Shut Down

V

  • VFD - Variable Frequency Drive
  • V - Vent
  • VTA - Vent to Air
  • VAHH - Vibration Alarm High High
  • VY - Vibration Computer
  • VE - Vibration Element
  • VI - Vibration Indicator
  • VIT - Vibration Indicator Transmitter
  • VR - Vibration Recorder
  • VRT - Vibration Recording Transmitter
  • VS - Vibration Switch
  • VT - Vibration Transmitter

W

  • WY - Weight Computer
  • WCV - Weight Control Valve
  • WC - Weight Controller
  • WDC - Weight Differential Computer
  • WDCV - Weight Differential Control Valve
  • WDC - Weight Differential Controller
  • WDI - Weight Differential Indicator
  • WDIC - Weight Differential Indicator Controller
  • WDIT - Weight Differential Indicator Transmitter
  • WDR - Weight Differential Recorder
  • WDRC - Weight Differential Recorder Controller
  • WDRT - Weight Differential Recorder Transmitter
  • WDSH - Weight Differential Switch High
  • WDSL - Weight Differential Switch Low
  • WDT - Weight Differential Transmitter
  • WE - Weight Element
  • WI - Weight Indicator
  • WIC - Weight Indicator Controller
  • WIT - Weight Indicator Transmitter
  • WR - Weight Recorder
  • WEC - Weight Recorder Controller
  • WRT - Weight Recorder Transmitter
  • WSH - Weight Switch High
  • WSHL - Weight Switch High Low
  • WSl - Weight Switch Low

Y

  • YY - Event Computer
  • YC - Event Controller
  • YE - Event Element
  • YI - Event Indicator
  • YIC - Event Indicator Controller
  • YR - Event Recorder
  • YSH - Event Switch High
  • YSL - Event Switch Low
  • YT - Event Transmitter

Z

  • ZC - Position Controller
  • ZCV - Position Control Valve
  • ZDY - Gauge Deviation Computer
  • ZDCV - Gauge Deviation Control Valve
  • ZDC - Gauge Deviation Controller
  • ZDE - Gauge Deviation Element
  • ZDI - Gauge Deviation Indicator
  • ZDIC - Gauge Deviation Indicator Controller
  • ZDIT - Gauge Deviation Indicator Transmitter
  • ZDR - Gauge Deviation Recorder
  • ZDRC - Gauge Deviation Recorder Controller
  • ZDRT - Gauge Deviation Recorder Transmitter
  • ZDSH - Gauge Deviation Switch High
  • ZDSL - Gauge Deviation Switch Low
  • ZDT - Gauge Deviation Transmitter
  • ZE - Position Element
  • ZI - Position Indicator
  • ZIC - Position Indicator Controller
  • ZIT - Position Indicator Transmitter
  • ZR - Position Recorder
  • ZRC - Position Recorder Controller
  • ZRT - Position Recorder Transmitter
  • ZS - Position Switch
  • ZSC - Position Switch Closed
  • ZSO - Position Switch Open
  • ZSHL - Position Switch High Low
  • ZT - Position Transmitter
  • ZY - Position Computer