According to the counterflow principle operating a portable helium - leak detector for testing of plants which have available a separate pumping unit.

摘要

To helium leak detector, operating in the other hand, - current comprising only a single pump (1), said pump (1) being a secondary vacuum pump comprising an inlet (3) and an outlet (4), a gas analyzer (2) being connected to the inlet (3) of the pump, said output (4) being connected, via an inlet valve (6), with an orifice (5) for connection to an installation (10) to be tested, the said plant being under vacuum or may be connected to the primary pumping means (11), the detector also comprises electronic circuits of the supply and control means (16, 17), the voltage-applying means (15) and display means (48, 49, 50), characterized in that it comprises a first gauge (7) for measuring pressure which is situated between said inlet valve (6) and said connection port (5), a handle (21) of control of the starting of the detector, the control circuits (17) ensuring the opening of said inlet valve (6) and the starting of the said secondary vacuum pump (1), if the detector being under tension, said control handle (21) has been actuated, and when the pressure measured by the first gauge (7) is lowered to the - below a predetermined value, the starting of the gas analyzer (2) being carried out automatically when said secondary vacuum pump (1) has reached its nominal speed, the vacuum pump is a mechanical pump.