HG/T 20510-2000 in English

Scope

1.O.1 This regulation applies to the air supply design of measurement and control instruments for manual chemical equipment. 1.O.2 The load of the instrument air supply system includes indicators, recorders, analyzers, signal converters, gas line solenoid valves, relays, transmitters, electrical valve positioners, actuators and other pneumatic instruments and blowers. Gas for liquid level gauge, gas for air blowing method measurement, gas for positive pressure explosion-proof ventilation, gas for debugging and maintenance of pneumatic instruments in instrument repair workshop, gas for instrument purging, etc. 1.0.3 The air source for instruments generally uses clean, dry compressed air. When necessary, nitrogen can be used as a temporary backup gas source. 1.O.4 When implementing these regulations, it should still comply with the relevant national standards.