ISA-S7.4-1981:Air Pressure For Pneumatic Controllers, Transmitters, And Transmission Systems

This standard specifies the pneumatic transmission signals used in industrial process measurement and control systems to transmit information between elements of systems. It does not apply to signals used entirely within an element. It does apply to: Pneumatic controllers, Pneumatic transmitters and information transmission systems, and Current-to-pressure transducers.

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