Leak high-vacuum range

The source operating pressure is the vacuum necessary to operate the leak detection device. This pressure is not specific, rather it is a pressure range within the leak detector which works. Optimistically, we want the helium leak detector, and the system to which it is connected, to have the greatest possible vacuum. This gives the tracer-probe technique the maximum sensitivity with the quickest response time. As an added benefit, when one is operating at a very high vacuum,... 

Autotuning involves adjusting a number of mass spectrometer parameters in order to maximize instrument sensitivity over the mass range, using PFTBA masses. Thus, stabihty is crucial for reproducible tuning. PFTBA enters the vacuum manifold automatically when a tune is initiated. High peaks (>5%-10%) at 18 (mass related to H2O), 28 (mass related to N2), and 32 amu (mass related to O2) may indicate an air leak in the system. 

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