実用向きな測差ビラニ型リークデテクター

抄録

Several experiments about a differential-Pirani-type leak-detector were carried out especially on the trap agent and electrial system.
The cold trap used in Blears' type differential methods is replaced to a activated carbon trap and the sensitivity is same order to the case of liquid air trap.
Also the Pirani bridge is drived by alternating current (1000 c.p.s.) and its deflection voltage is amplified to scores of volts and detected by A.C. meter or speaker.
This unit is very convenient to be operated by anyone not professional or at any place.