This standard is applicable to the utilized air supply for the industrial process measurement and control instruments
1 Definitions
1.1 Online pressure
It refers to the air pressure delivered by pipe network from purification plant outlet to input end of meter.
1.2 Lower limit value of ambient temperature
It includes the minimum temperature where the overall system, including purification plant outlet, pipe network and meter, is located.
2 Pressure Range
2.1 The pressure range of air supply at purification plant outlet shall be 300~ 500kPa and 500~800kPa (3~5kgf/cm2 and 5~8kgf/cm2).
2.2 Pressure range of air supply at meter input end
2.2.1 The nominal value of air supply pressure at meter input end shall be 140, 260, 350, 550 and 700kPa (1.4, 2.6, 3.5, 5.5, and 7.0kgf/cm2).
2.2.2 The allowable fluctuation range of air supply pressure at meter input end shall be±10% of the nominal value.
