Measuring and testing – With fluid pressure – Leakage
Patent
1983-08-24
1985-04-16
Levy, Stewart J.
Measuring and testing
With fluid pressure
Leakage
G01M 322
Patent
active
045107920
ABSTRACT:
A tracer gas leakage detector mainly comprises a primary vacuum pump which is selectably connectable to a unit to be tested for leakage, an inlet valve also connectable to the unit to be tested and communicating with a measurement cell capable of being evacuated by a primary pump and a secondary pump. The inlet valve includes a motor-controlled valve member to enable the aperture through the inlet valve to be servo-controlled to the inlet pressure of the measurement cell, and conversion means providing an electrical signal representative of the aperture. The apparatus for measuring and displaying the leakage flow rate is connected to receive the aperture size representing electrical signal and includes a display system for displaying, as a function of the aperture size representing electrical signal, a valid sub-range of n decades of possible valid measurements taken from a total measuring range of N decades for the apparatus as a whole, thereby warning users that any indicated leakage flow rate values outside the valid sub-range are spurious. The N decades may be marked on a band (22) which is movable relative to a window (24). A pointer (25) is also movable relative to the window. A reading is valid if the pointer lies in the window.
REFERENCES:
patent: 3327521 (1967-06-01), Briggs
patent: 3342990 (1967-09-01), Barrington et al.
patent: 3416359 (1968-12-01), Durbin et al.
patent: 3592048 (1971-07-01), Maurice et al.
patent: 3626760 (1971-12-01), Briggs et al.
patent: 3690151 (1972-09-01), Briggs
patent: 3968675 (1976-07-01), Briggs
patent: 4365158 (1982-12-01), Tallon
patent: 4436998 (1984-03-01), Tallon
Morel Jacques
Tallon Jacques
Compagnie Industrielle des Telecommunications Cita-Alcatel
Levy Stewart J.
Roskos Joseph W.
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