초록 ▼

Method for operating, a helium leak indicator (1) consisting of a helium detector (4) with evacuation devices comprising at least a high-vacuum pump (6), a backing pump (9) and a valve (16) whose level of flow conductance can be adjusted and serves to modulate the through-flow of test gas to be anal

Method for operating, a helium leak indicator (1) consisting of a helium detector (4) with evacuation devices comprising at least a high-vacuum pump (6), a backing pump (9) and a valve (16) whose level of flow conductance can be adjusted and serves to modulate the through-flow of test gas to be analyzed; in order to influence the sensitivity in a simple manner, the method provides that the modulation properties be changeable in such a manner that the effective pumping capacity at the inlet of the leak indicator is changed by the adjustment of the modulation properties.

대표청구항 ▼

1. A method of operating a helium leak indicator that contains a helium detector which is connected to a high vacuum pump and a backing pump for evacuating the detector and an adjustable valve that is arranged to modulate the flow of a test gas to be analyzed through the detector, said method includ

1. A method of operating a helium leak indicator that contains a helium detector which is connected to a high vacuum pump and a backing pump for evacuating the detector and an adjustable valve that is arranged to modulate the flow of a test gas to be analyzed through the detector, said method including the steps of applying a modulated input signal to said valve, modulating the input signal to the valve to adjust the level of flow conductance of said valve so that the effective pumping capacity of the leak indicator is modified at the inlet to the leak indicator, modulating the input signal prior to performing a leak test to adjust the sensitivity of the leak indicator, and further modulating the input signal to adjust the sensitivity of the leak indicator as a test is being conducted.