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When considering these four factors, when determining system
specifications, the smallest leak rate will be the maximum allowable leak
rate. If the content of the test object is liquid, it is necessary to correlate
the maximum liquid leak rate to the leak rate of helium. Once the
maximum leak rate of the liquid in the test object has been calculated, it is
very simple to conduct an accurate leak test for an object designed to
contain liquid, since a calibrated helium gas standard is an integral part of
the MS-40.
Of all the instruments and devices used for leak detection, helium-
sensitive mass spectrometer based leak detectors such as the MS-40 have
been proven to be by far the most sensitive and accurate. Further, this
type of unit is generally easily calibrated, does not require operator
judgement to be used effectively, and most importantly, is not destructive
or harmful to test personnel or the tested object.
The remainder of this chapter describes in detail the operation of the MS-40
portable leak detector. It is divided into a discussion of direct and reverse
flow modes, a functional description of the leak detector and a description
of the major components and their functions within the MS-40.
Vacuum Instrument Corp.
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System failure during the operational life of the system
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Hazards to personnel and equipment when leaks occur
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Unacceptable appearance of the system
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Assurance of proper design and construction of the
manufactured equipment.
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