FIELD: measurement equipment.
SUBSTANCE: invention relates to the field of leak testing. Substance: a leak detector has a test inlet hole (10) for connection of a tested test chamber. A high-vacuum pump (12) pulls high vacuum in a test gas detector (11). A forevacuum pump (20) comprises two pump stages (22, 23). For test chamber pumping the pump stages (22, 23) are put in action in parallel, besides, their speeds of pumping are summed up. After achievement of the necessary vacuum the pump stages (22, 23) are put in action in series for pulling the necessary high vacuum in the test gas detector (11).
EFFECT: development of a leak detector with the possibility of simplified switching between modes of pumping and detection.
6 cl, 1 dwg
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