| 摘要 |
<p>The method for operating a helium leak indicator (1) comprises of a helium detector (4) with an evacuation device. Said evacuation device is primarily comprised of a high-vacuum pump (6),a backing pump (9) and a valve (16) whose level of 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 are changeable. With changes in the modulation properties, the effective pumping capacity is modified at the inlet to the leak detector.</p> |
