Positive-displacement vacuum pumps; Measurement of performance characteristics; Part 1 : Measurement of volume rate of flow (pumping speed)
Описание (англ.):
The method of determining the volume of gas which flows in unit time through the pump inlet are specified. The considered pumps discharge the gas against atmosphere pressure and achieve a limiting inlet pressure of less than 100 Pa in one stage. The dome or test header, ultimate pressure and dry air as test gas are considered.