This article covers the common Instrumentation Abbreviations, Instrumentation Definitions, Instrumentation Symbols, Nomenclature, and Acronyms.
Instrumentation Abbreviations
The below table shows different types of symbols used in industrial automation.
| Symbol | Description |
|---|---|
| A | Analog Signal |
| AC | Analysis Controller |
| AAH | Analysis Alarm [High] |
| AAHL | Analysis Alarm [High/Low] |
| AAL | Analysis Alarm [Low] |
| AS | Air Supply |
| ASDH | Analysis Shutdown [High] |
| ASDL | Analysis Shutdown [Low] |
| ASH | Analysis Switch [High] |
| ASHL | Analysis Switch [High/Low] |
| ASL | Analysis Switch [Low] |
| AT | Analysis Transmitter |
| BC | Burner Controller |
| BAH | Burner Alarm [High] |
| BAHL | Burner Alarm [High/Low] |
| BAL | Burner Alarm [Low] |
| BDV | Blowdown Valve |
| BPR | Back Pressure Regulator |
| BS | Burner Switch |
| BSH | Burner Switch [High] |
| BSHL | Burner Switch [High/Low] |
| BSL | Burner Switch [Low] |
| BS&W | Basic Sediment and Water |
| CCP | Central Control Panel |
| CDS | Compressor Shutdown |
| CFA | Common Fault Alarm |
| COR | Corrosimeter |
| CSC | Car Seal Close |
| CSO | Car Seal Open |
| CV | Control Valve |
| E/I | EMF to Current Converter |
| ES | Electrical Switch |
| ESD | Emergency Shutdown Station |
| ESDV | Emergency Shutdown Valve |
| FAL | Flow Alarm Low |
| FAH | Flow Alarm High |
| FAHH | Flow Alarm High For Level Above FAH |
| FAHL | Flow Alarm [High/Low] |
| FALL | Flow Alarm Low For Level Below FAL |
| FC | Flow Controller |
| FC | Fail Close |
| FCV | Flow Control Valve |
| FE | Flow Element |
| FFA | Flame Failure Alarm |
| FFSD | Flame Failure Shutdown |
| FG | Flow Gage/Flow Sight Glass |
| FI | Flow Indicator |
| FIC | Flow Indicator Controller |
| FIT | Flow Indicator Transmitter |
| FO | Fial Open |
| FQ | Flow Indicator Totaliser |
| FQI | Flow Indicator with Total Counter [Positive Displacement] |
| FR | Flow Recorder |
| FRC | Flow Recorder Controller |
| FRT | Flow Recorder Transmitter |
| FS | Flow Switch |
| FSDH | Flow Shutdown [High] |
| FSDL | Flow Shutdown [Low] |
| FSH | Flow Switch [High] |
| FSL | Flow Switch [Low] |
| FT | Flow Transmitter |
| FY | Computer, Relay, Amplifier or I/P Converter etc. in Flow Loop |
| GS | Instrument Gas Supply |
| H | Hydraulic |
| HMV | Hydraulic Motor Operated Valve |
| HOA | Hand/Off/Auto Switch |
| HS | Hand Switch |
| I | Current Signal |
| I/F | Interface |
| I/I | Current Indicator |
| I/P | Current to Pneumatic |
| I/PA | Current to Pneumatic Alarm |
| KI | Clock/Timer |
| LA | Level Alarm |
| LAH | Level Alarm [High] |
| LAHH | Level Alarm High for Level Above LAH |
| LAHL | Level Alarm [High/Low] |
| LAL | Level Alarm [Low] |
| LALL | Level Alarm Low for Level Above LAL |
| LC | Level Controller |
| LCV | Level Control Valve |
| LG | Level Gauge |
| LI | Level Indicator |
| LIC | Level Indicator Controller |
| LIT | Level Indicator Transmitter |
| LLH | Liquid Level [High] |
| LLL | Liquid Level [Low] |
| LLN | Liquid Level [Normal] |
| LQ | Lock Closed [When By A Manual Valve] |
| LR | Level Recorder |
| LS | Level Switch |
| LSDH | 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 LSH |
| LSLL | Level Switch Low for Level Below LSL |
| LT | Level Transmitter |
| LY | I/P Converter [Level Loop] |
| LO | Lock Open |
| MCC | Motor Control Center |
| MTU | Master Terminal Unit |
| NC | Normally Closed |
| NO | Normally Open |
| P | Pneumatic Signal |
| PAH | Pressure Alarm [High] |
| PAHL | Pressure Alarm [High/Low] |
| PAL | Pressure Alarm [Low] |
| PB | Pushbutton |
| PC | Pressure Controller |
| PCV | Pressure Control Valve |
| PD | Pulsation Dampener |
| PdA | Pressure Differential Alarm |
| PdAH | Pressure Differential Alarm [High] |
| PdAL | Pressure Differential Alarm [Low] |
| PdI | Pressure Differential Indicator |
| PdIC | Pressure Differential Indicator Controller |
| PdS | Pressure Differential Switch |
| PdSH | Pressure Differential Switch [High] |
| PdSL | Pressure Differential Switch [Low] |
| PG | Pressure Gage |
| P/I | Pneumatic To Current Converter |
| PI | Pressure Indicator |
| PIC | Pressure Indicator Controller |
| PIT | Pressure Indicator Transmitter |
| PJI | Multipoint Pressure Indicator |
| PJR | Multipoint Pressure Recorder |
| POV | Pneumatically Operated Valve |
| PR | Pressure Recorder |
| PRC | Pressure Recorder Controller |
| PRT | Pressure Recorder Transmitter |
| PRV | Pressure Regulating Valve |
| PSDH | Pressure Shutdown [High] |
| PSDL | Pressure Shutdown [Low] |
| PSE | Rupture Disk |
| PSH | Pressure Switch [High] |
| PSHH | Pressure Switch High for Pressure Above PSH |
| PSHL | Pressure Switch [High/Low] |
| PSL | Pressure Switch [Low] |
| PSLL | Pressure Switch Low for Pressure Below PSL |
| PSV | Pressure Safety Valve |
| PT | Pressure Transmitter |
| POS | Positioner |
| PY | Relay, Computer, Amplifier, Converter or I/P Converter etc/ in Pressure Loop |
| RC | Ratio Controller |
| RTD | Resistance Temperature Detector |
| RTU | Remote Terminal Unit |
| S | Solenoid |
| SAH | Speed Alarm [High] |
| SAHL | Speed Alarm [High/Low] |
| SAL | Speed Alarm [Low] |
| SC | Sample Connection |
| SD | Shutdown Panel |
| SI | Speed Indicator |
| SR | Speed Recorder |
| SS | Steam Supply |
| SSH | Speed Switch [High] |
| SSHL | Speed Switch [High/Low] |
| SSL | Speed Switch [Low] |
| TAH | Temperature Alarm [High] |
| TAHL | Temperature Alarm [High/Low] |
| TAL | Temperature Alarm [Low] |
| TC | Temperature Controller |
| TCV | Temperature Control Valve |
| TD | Time Delay |
| TE | Temperature [Measuring] Element/Thermocouple |
| TF | Temperature Gage |
| TH | Thermostat |
| TI | Temperature Indicator |
| TIC | Temperature Indicator Controller |
| TIT | Temperature Indicator Transmitter |
| TJI | Multipoint Temperature Indicator/Thermocouple |
| TR | Temperature Recorder |
| TRC | Temperature Recorder Controller |
| TRT | Temperature Recorder Transmitter |
| TSDH | Temperature Shutdown [High] |
| TSDL | Temperature Shutdown [Low] |
| TSH | Temperature Switch [High] |
| TSHL | Temperature Switch [High/Low] |
| TSL | Temperature Switch [Low] |
| TT | Temperature Transmitter |
| TW | Thermowell |
| TY | Computer, Relay, Converter, etc. in Temperature Loop |
| US | Utility Station |
| VAH | Vibration Alarm [High] |
| VSDH | Vibration Shutdown [High] |
| VSH | Vibration Switch [High] |
| WS | Water Supply |
| X | Multiply |
| ZC | Position Switch [Closed] |
| ZO | Position Switch [Open] |
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Hello dear sir.
I want to know about varyable frequency drive. I want a material of VFD. How to set parameters and how vfd works. For what purpose vfd is used? I am very thank full to you. I can get any instrument here but about vfd i cant access into it.
Hello Vishal, Basics of VFD, Principle & Purpose topics are posted in Electrical Category.
Thank you so much Sir. Your notes have been very helpful!
Extremely Handy…Thank you,