Abstract
An experimental investigation of the differential method of detecting leaks in high vacuum systems has shown that it is possible to attain a sensitivity 20 times greater than that of the corresponding single gauge method. The differential pressure change may be produced either by differential condensation of gases such as butane or by chemical absorption of carbon dioxide. With the latter method, using extremely simple equipment, a sensitivity of 10-3 lμ/sec may be obtained. With differential condensation and ionization gauges the sensitivity is only a factor 10 less than that of the mass spectrometer leak detector.
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