Some of the standard below which frequently used the Instrument Engineer is:
• ISA S5.1 Instrument Symbol and Identification
• ISA S5.2 Binary Logic Diagram for Process Operation
• ISA S5.3 Graphic Symbol for DCS Logic and Computer System
• ISA S5.4 Instrument Loop Diagrams
• ISA S5.5 Graphic Symbol for Process Display
• ISA S7.0.01 Quality Standard for Instrument Air
• ISA S18.1 Annunciator Sequences and Specifications
• ISA S20 Specification Forms for Process Measurement and Control Instruments, Primary Elements and Control Valves
• ISA S71.01 Environmental conditions for process measurements and control systems: Temperature and Humidity
• ISA S71.04 Environmental conditions for process measurements and control systems: Airborne and contaminants
• ISA S75.03 Face to Face Dimensions for Flanged Globe Style Control Valves
• ISA S75.11 Control Valve Flow Characteristics and Rangeability
• ISA S84.01 Application of Safety Instrumented Systems for the Process Industries
• ISA RP 3.2 Flange Mounted Sharp Orifice Plates for Flow Measurement
• ISA RP 12.1 Electrical Instruments in Hazardous Atmospheres
• ISA RP 12.4 Instrument Purging for Reduction of Hazardous Area Classification
• ISA RP 12.6 Installation of Intrinsically Safe Instrument Systems in Class I Hazardous Locations
• ISA RP 12.11 Electrical Instruments in Hazardous Dust
• ISA RP 12.12 Electrical Equipment for Use in Class I, Division Hazardous (Classified) Locations
• ISA RP 31.1 Specification, Installation, and Calibration of Turbine Flowmeters
• ISA RP 60.6 Nameplates, Labels and Tags for Control Centres
• ISA RP 60.8 Electrical Guide for Control Centres
• ISA RP 60.9 Piping Guide for Control Centres
• ISA RP 551 Hardware testing of Digital Process Computer
• ISA RP 5517 Hardware Testing of Digital Process Computer Codes of Practice Testing Computer based System
