Analysis of partial pressures by means of omegatron and farvitron: Comparative view of the ranges of application

Abstract

The wide range of high vacuum technical problems, a solution of which may only be obtained by means of partial pressure analysis, is responsible for the fact that a variety of measuring methods becomes necessary. This applies in particular to sensitivity, pressure range, and rapid and comprehensive response. The two partial pressure gauges—the Omegatron and the Farvitron (see paper given by W. Tretner, Darmstadt)—dealt with in the present paper are matching each other in an ideal manner. While the Omegatron having high sensitivity and good resolving power allows only the subsequent measuring of single partial pressures, the Farvitron gives a complete survey of the composition of partial pressures on an oscillograph. For this reason the Farvitron having less resolving power and lower sensitivity is highly suitable for indicating partial pressures especially during rapidly varying processes in the pressure range between 10 -8 and 10 -5 Torr.