Portable counter-flow helium leak detector for testing a vessel provided with its own pumping group

Abstract

Abstract Portable helium leak detector, operating in counter-flow mode and comprising only one single pump (1), the 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 said pump, the said outlet (4) being connected, via an inlet valve (6), to an orifice (5) for connecting to an installation (10) to be tested, the said installation being under vacuum or able to be connected to primary pumping means (11), the detector furthermore comprising electronic supply and control circuits (16, 17), powering-up means (15) and display means (48, 49, 50), characterised in that it comprises a first gauge (7) for measuring pressure located between the said inlet valve (6) and the said connecting orifice (5), a control lever (21) for starting the detector, the said control circuits (17) ensuring the opening of the said inlet valve (6) and the starting of the said secondary vacuum pump (1) if, the detector being powered up, the said control lever (21) has been operated and when the pressure measured by the said first gauge (7) has dropped below a predetermined value, the starting of the gas analyzer (2) being carried out automatically when the said secondary vacuum pump (1) has reached its nominal speed, and in that it furthermore comprises a second gauge (8) for measuring pressure located at the level of the said vacuum pump (1), means being provided such that, the detector being powered up, the setting into the rest position of the said control lever (21) causes the closing of the said inlet valve (6) if the latter is open, while maintaining the supply of the said pump (1) if the pressure measured by the said second measuring gauge (8) is less than a reference value, the gas analyzer (2) being also maintained in the operating state if the said pump (1) is at its nominal speed, the latter being a rotary mechanical pump. <IMAGE>

Inventors

• 👤 Gilles Baret
• 👤 Roland Gevaud

Bibliographic Details