Characteristics of the Bayard-Alpert Ionization Gauge at Pressures above 10−5 mm Hg

Abstract

Bayard-Alpert ionization gauges were calibrated in the range from 10−5 to about 10−1 mm Hg for various gases. In this pressure range, it is necessary to operate with grid currents below 100 μa in order to minimize the effects of gauge pumping and to prevent space charge from affecting the operation of the gauge. The gauge becomes insensitive to pressure when the ion current reaches 20 to 30% of the electron current. However, linearity is preserved only up to an ion current of about two percent of the electron current. Some of the reasons for the high pressure behavior of the Bayard-Alpert gauge are discussed.

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