COSA Xentaur SF6 Purity Pro - Manual (Page 13)

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An example of measurement when the pressure of the sampling point is higher than that of the
atmospheric pressure:
Make an inlet (a) as drawn below. Open and shut the stop valve to feed the gas to the
instrument, rather than turning the pump on and off. Read the indication when the valve is
shut off and the gas flow completely stops. Flow rate at inlet (a) should be 300 to 400mL.
GAS OUT should be at the atmospheric pressure and the REF. OUT should face fresh air.
An example of measurement when the measured gas is not released into the air:
Connect a gas-sampling bag to the GAS OUT so that exhaust is not emitted into the air.
Expose the REF. OUT to the fresh air.