Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

ISA Instrumentation Codes used in Process Control Systems

The ISA standards and symbols are important for the P&IDs and documents describing the process control system.

Sponsored Links
Process VariableSymbolType of InstrumentSymbol
Analyses A Alarm A
Burner B Users Choice B
Combustion B Controller C
Users Choice C Control valve CV
Users Choice D Trap CV
Voltage V Sensor (primary element) E
Flow Rate F Rupture disc E
Users Choice G Sight or gage glass G
Current (electric) I Monitor G
Power J Indicator I
Time K Control Station K
Level L Light (pilot/operation) L
Users Choice M Users Choice N
Users Choice

N

Flow Resistance Orifice O
Users Choice O Test point (sample point) P
Pressure / Vacuum P Recorder R
Radiation R Switch S
Speed (or Frequency) S Transmitter T
Temperature T Multifunction U
Multivariable U Valve/Damper V
Vibration V Well W
Weight (force) W Unclassified X
Unclassified X Relay Y
Event Y Driver Z
Position, dimension Z Actuator Z

Example - ISA symbols for a Level Indicator

A level indicator will receive the symbol "L" for the process variable "Level", and "I" for the "Indicator" type of instrument. Both combines to:

LI

For unique identification within a system it is common to add a number to the ISA code, by example the code for level indicator no. eight may be:

LI 08
Sponsored Links

Related Topics

Related Documents

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • Engineering ToolBox, (2003). ISA Instrumentation Codes used in Process Control Systems. [online] Available at: https://www.engineeringtoolbox.com/isa-iso-instrumentation-codes-d_37.html [Accessed Day Mo. Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

3 30

Sponsored Links
.