Instrumentation and Control Symbols

Here we look at common instrument symbols used in various types of technical diagrams that are used to document instrument systems.

Instrument Bubbles

Line Types

Note that, the single backlash signifying discrete or binary type has been removed from ISA standard. Regular Pneumatic and Electrical Line Symbols may represent either continuous or discrete states. 

Process/Instrument Line Connections

Process Valve Types

Valve Actuator Types

Valve Failure Mode

Liquid Level Measurement Devices

Flow Measurement Devices  (Flowing from left to right)

Process Equipment Symbols

Functional Diagrams Symbols

Single-line electrical diagram

Fluid Power Diagram Symbols

You can also read: 

• Basics of Instrumentation and Control Systems
• Process Flow Diagrams

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