Environmental conditions and other requirements for gas meter verification:
    1When calibrating the pneumatic measuring instrument, the room temperature should be at(20±5) ℃The room temperature change should not exceed1℃/h. Pneumatic measuring instruments and calibrators should balance the temperature in the room for no less time4h.
    2The rated gas supply pressure of the gas source is0.4MPaThe supply gas pressure is allowed in0.4MPa~0.65MPaWithin the range of changes, compressed air must pass through the air filter to remove oil, water and other impurities.
    3The gas output connector of the pneumatic measuring instrument and the sensor are connected with a plastic hose. Its inner diameter is4mmThe wall thickness should be less than1.5mmThe length is not greater than1.5m.
    4The magnification of the buoy pneumatic measuring instrument should be adjusted to the nominal value when the measurement performance is verified.
    5The verification room should be clean, and there should be no vibration and magnetic field that affect the measurement performance.
    6The power supply voltage is(200~240) V,(50~60) Hz.

    7The verification work should be connected to the air source and power supply of the instrument under test30minProceed later.

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