LEAKAGE SEARCH DEVICE

摘要

A leakage search device has a backing pump connected to a test chamber (42) via a test gas line (48). Furthermore provided is a high-vacuum pump (10), at the inlet (36) of which a test gas detector (38) is arranged. The outlet (34) is connected to the backing pump (40). The test gas line (44) is connected, via a connecting line (48), to an intermediate region (50) arranged between the inlet (36) and the outlet (34) of the high-vacuum pump (10) for a non-detailed investigation of the object. A counter-flow path of the test gas, which extends from the intermediate region (50) to the inlet (36) is here shorter than the main flow path from the inlet (36) to the outlet (34) of the high-vacuum pump (10). Furthermore, a gas expansion device (44) for expanding the test gas to a pressure that is matched to the internal pressure level and suction capability of the high-vacuum pump (10) in the intermediate region (50) is arranged in the connecting line (48).