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Process Instrumentation - ISA Codes

ISA process instrumentation codes - and combinations.

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It is common to make letter combinations in PI&D diagrams according ANSI/ISA S5.1-1984 (R 1992) "Instrumentation symbols and identification".

In addition to the letter combination a succeeding number as a unique identification of the actual instrument is commonly used. The numbering practice varies - some use a sequential number, others use a number related to the process line number or similar.

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First Letter

First letter indicates a measured or initiating variable, or a modifier, such as Current (I), Speed (S) or Flow (F).

Measured or Initiating Variable

A - Analysis
B - Burner, combustion
C - User's choice
D - User's choice
E - Voltage
F - Flow rate
G- User's choice
H - Hand
I - Current (electrical)
J - Power
K - Time, time schedule
L - Level
M- User's choice
N- User's choice
O- User's choice
P - Pressure, vacuum
Q - Quantity
R - Radiation
S - Speed, frequency
T - Temperature
U - Multivariable
V - Vibration, mechanical analyses
W - Weight, force
X - Unclassified
Y - Event, state or presence
Z - Position, dimension

Modifier

D - Differential
F - Ration (fraction)
J - Scan
K - Time rate of change
M - Momentary
Q - Integrate, totalizer
S - Safety
X - X-axis
Y - Y-axis
Z - Z-axis

Second or Succeeding Letters

Second or succeeding letters indicates a readout or passive function, output function or a modifier function.

Readout or Passive Function

A - Alarm
B - User's choice
E - Sensor (primary element)
G- Glass, viewing device
I - Indication
L - Light
N- User's choice
O- Orifice, restriction
P - Point (test connection)
R - Record
U - Multifunction
W - Well
X - Unclassified

Output Function

B - User's choice
C - Control
K - Control Station
N- User's choice
S - Switch
T - Transmit
U - Multifunction
V - Valve, damper, louver
X - Unclassified
Y - Relay, compute, convert
Z - Driver, actuator

Modifier Function

B - User's choice
H - High
L - Low
M - Middle, intermediate
N- User's choice
U - Multifunction
X - Unclassified

Examples - P&ID codes

Flowmeter - Indicating

FI 001

Temperature - Transmitter

TT 001

Control Valve

FV 001

Position Switch - High Level

ZSH 001

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Related Topics

Documentation - Documentation of process control systems - Block Flow Diagrams (BFD), Process Flow Diagrams (PFD), Piping and Instrumentation Diagrams (P&ID) and more
Process Control - Instrumentation and process control systems - design and documentation.
Temperature Measurement - Measurment of temperature - probes, sensors and transmitters.
Measurements & Instrumentation - Measurement and instrumentation strategies.

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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.
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P&ID Diagram - Online Drawing Tool - Draw P&ID diagrams online in the browser with Google Docs.
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