Document Type and Number:
Japanese Patent JPS5531895
Kind Code:
B1
Abstract:
In a method of operating a halogen detection diode having a filament-heated anode, which emits ions when impacted by halogen gas, and a cathode, fundamental ion current variations of the diode are constantly sensed and the filament heating current is regulated in accordance with the sensed ion current variations to counteract the ion current variations to maintain the fundamental ion current substantially constant. The ion current peak, which occurs under the action of an halogenous gas on the anode of the diode, is measured and serves as an indication of the halogen action. The arrangement for effecting the method includes a measuring amplifier connected to the cathode of the detection diode, an indicating meter and preferably an alarm device connected to the output of the measuring amplifier, a current supply for the filament and an adjusting means connecting the current supply to the filament. A variable gain amplifier is connected to the cathode of the detection diode and to the setting means to regulate the filament heating current in a corrective sense in accordance with sensed fundamental ion current variations. The arrangement and method are used primarily for checking leakage of an atmosphere containing an halogenous gas.
Application Number:
JP4737471A
Publication Date:
August 21, 1980
Filing Date:
June 30, 1971
Export Citation:
International Classes:
G01M3/20; G01N27/70; (IPC1-7): G01N27/62