OIL AND GASINSTRUMENT ABBREVIATIONS(Adapted From ISA Standard S5.1)

- A - - A -A Analog SignalAC Analysis ControllerAAH Analysis Alarm [High]AAHL Analysis Alarm [High/Low]AAL Analysis Alarm [Low]AS Air SupplyASDH Analysis Shutdown [High]ASDL Analysis Shutdown [Low]ASH Analysis Switch [High]ASHL Analysis Switch [High/Low]ASL Analysis Switch [Low]AT Analysis Transmitter- B - - B -BC Burner ControllerBAH Burner Alarm [High]BAHL Burner Alarm [High/Low]BAL Burner Alarm [Low]BDV Blowdown ValveBPR Back Pressure RegulatorBS Burner SwitchBSH Burner Switch [High]BSHL Burner Switch [High/Low]BSL Burner Switch [Low]BS&W Basic Sediment and Water- C - - C -CCP Central Control PanelCDS Compressor ShutdownCFA Common Fault AlarmCOR CorrosimeterCSC Car Seal CloseCSO Car Seal OpenCV Control Valve- E - - E -E/I EMF to Current ConverterES Electrical SwitchESD Emergency Shutdown StationESDV Emergency Shutdown Valve- F - - F -FAL Flow Alarm LowFAH Flow Alarm HighFAHH Flow Alarm High For Level Above FAHFAHL Flow Alarm [High/Low]FALL Flow Alarm Low For Level Below FALFC Flow ControllerFC Fail CloseFCV Flow Control ValveFE Flow ElementFFA Flame Failure AlarmFFSD Flame Failure ShutdownFG Flow Gage/Flow Sight GlassFI Flow IndicatorFIC Flow Indicator ControllerFIT Flow Indicator TransmitterFO Fial OpenFQ Flow Indicator TotaliserFQI Flow Indicator with Total Counter [Positive Displacement]FR Flow Recorder

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OIL AND GASINSTRUMENT ABBREVIATIONS(Adapted From ISA Standard S5.1)

FRC Flow Recorder ControllerFRT Flow Recorder TransmitterFS Flow SwitchFSDH Flow Shutdown [High]FSDL Flow Shutdown [Low]FSH Flow Switch [High]FSL Flow Switch [Low]FT Flow TransmitterFY Computer, Relay, Amplifier or I/P Converter etc. in Flow Loop- G - - G -GS Instrument Gas Supply- H - - H -H HydraulicHMV Hydraulic Motor Operated ValveHOA Hand/Off/Auto SwitchHS Hand Switch- I - - I -I Current SignalI/F InterfaceI/I Current IndicatorI/P Current to PneumaticI/PA Current to Pneumatic Alarm- K - - K -KI Clock/Timer- L - - L -LA Level AlarmLAH Level Alarm [High]LAHH Level Alarm High for Level Above LAHLAHL Level Alarm [High/Low]LAL Level Alarm [Low]LALL Level Alarm Low for Level Above LALLC Level ControllerLCV Level Control ValveLG Level GaugeLI Level IndicatorLIC Level Indicator ControllerLIT Level Indicator TransmitterLLH Liquid Level [High]LLL Liquid Level [Low]LLN Liquid Level [Normal]LQ Lock Closed [When By A Manual Valve]LR Level RecorderLS Level SwitchLSDH Level Shutdown [High]LSDL Level Shutdown [Low]LSH Level Switch [High]LSHL Level Switch [High/Low]LSL Level Switch [Low]LSHH Level Switch High for Level Above LSHLSLL Level Switch Low for Level Below LSLLT Level TransmitterLY I/P Converter [Level Loop]LO Lock Open- M - - M -MCC Motor Control CenterMTU Master Terminal Unit- N - - N -NC Normally ClosedNO Normally Open

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OIL AND GASINSTRUMENT ABBREVIATIONS(Adapted From ISA Standard S5.1)

- P - - P -P Pneumatic SignalPAH Pressure Alarm [High]PAHL Pressure Alarm [High/Low]PAL Pressure Alarm [Low]PB PushbuttonPC Pressure ControllerPCV Pressure Control ValvePD Pulsation DampenerPdA Pressure Differential AlarmPdAH Pressure Differential Alarm [High]PdAL Pressure Differential Alarm [Low]PdI Pressure Differential IndicatorPdIC Pressure Differential Indicator ControllerPdS Pressure Differential SwitchPdSH Pressure Differential Switch [High]PdSL Pressure Differential Switch [Low]PG Pressure GageP/I Pneumatic To Current ConverterPI Pressure IndicatorPIC Pressure Indicator ControllerPIT Pressure Indicator TransmitterPJI Multipoint Pressure IndicatorPJR Multipoint Pressure RecorderPOV Pneumatically Operated ValvePR Pressure RecorderPRC Pressure Recorder ControllerPRT Pressure Recorder TransmitterPRV Pressure Regulating ValvePSDH Pressure Shutdown [High]PSDL Pressure Shutdown [Low]PSE Rupture DiskPSH Pressure Switch [High]PSHH Pressure Switch High for Pressure Above PSHPSHL Pressure Switch [High/Low]PSL Pressure Switch [Low]PSLL Pressure Switch Low for Pressure Below PSLPSV Pressure Safety ValvePT Pressure TransmitterPOS PositionerPY Relay, Computer, Amplifier, Converter or I/P Converter etc/ in Pressure Loop- R - - R -RC Ratio ControllerRTD Resistance Temperature DetectorRTU Remote Terminal Unit- S - - S -S SolenoidSAH Speed Alarm [High]SAHL Speed Alarm [High/Low]SAL Speed Alarm [Low]SC Sample ConnectionSD Shutdown PanelSI Speed IndicatorSR Speed RecorderSS Steam SupplySSH Speed Switch [High]SSHL Speed Switch [High/Low]SSL Speed Switch [Low]

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OIL AND GASINSTRUMENT ABBREVIATIONS(Adapted From ISA Standard S5.1)

- T - - T -TAH Temperature Alarm [High]TAHL Temperature Alarm [High/Low]TAL Temperature Alarm [Low]TC Temperature ControllerTCV Temperature Control ValveTD Time DelayTE Temperature [Measuring] Element/ThermocoupleTF Temperature GageTH ThermostatTI Temperature IndicatorTIC Temperature Indicator ControllerTIT Temperature Indicator TransmitterTJI Multipoint Temperature Indicator/ThermocoupleTR Temperature RecorderTRC Temperature Recorder ControllerTRT Temperature Recorder TransmitterTSDH Temperature Shutdown [High]TSDL Temperature Shutdown [Low]TSH Temperature Switch [High]TSHL Temperature Switch [High/Low]TSL Temperature Switch [Low]TT Temperature TransmitterTW ThermowellTY Computer, Relay, Converter, etc. in Temperature Loop- U - - U -US Utility Station- V - - V -VAH Vibration Alarm [High]VSDH Vibration Shutdown [High]VSH Vibration Switch [High]- W - - W -WS Water Supply- X - - X -X Multiply- Z - - Z -ZC Position Switch [Closed]ZO Position Switch [Open]

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