Process Instrumentation - ISA Codes

ISA process instrumentation codes and combinations calculator based on ANSI/ISA S5.1-1984 (R 1992). Combines letter codes to identify instruments in P&ID diagrams with optional sequential numbering.

ISA Code Generator

This tool helps you generate ISA process instrumentation codes according to ANSI/ISA S5.1-1984 standards. Select the appropriate letters for your instrument and add an optional identification number.

Calculator

Inputs

Results

ISA Code--
Full Identification--

Common Examples

CodeDescription
FI 001Flowmeter - Indicating
TT 001Temperature - Transmitter
FV 001Control Valve
ZSH 001Position Switch - High Level

Reference

Based on ANSI/ISA S5.1-1984 (R 1992) "Instrumentation symbols and identification"

Structure

  1. First Letter: Measured or initiating variable (A-Z)
  2. Modifier Letter (Optional): Modifies the first letter (D, F, J, K, M, Q, S, X, Y, Z)
  3. Second Letter: Readout, output, or modifier function
  4. Modifier Function (Optional): Further modifies the function
  5. Number: Sequential or process-line-related identification