Abstract

The differential Pirani-type leak detector with cold trap is not convenient for use at any place and in any direction on the vacuum system for it requires to prepare liquid air or nitrogen. In this investigation, we used a charcoal trap in one of the arms of Pirani tube so that we were free from such troubles as in the case of using a cold trap, and moreover we could improve the sensitivity and convenience by means of a.c. amplifier and audible alarm in the circuit.

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