Apparatus for measuring and/or monitoring a constituent of an at

Details Apparatus for measuring and/or monitoring a constituent of an at Apparatus for measuring and/or monitoring a constituent of an at

1979-08-09

1981-03-17

Petrakes, John

Measuring and testing

Gas analysis

By vibration

340632, G01N 2518

Patent

active

042559600

ABSTRACT:
A measuring cell having a measuring filament and a reference filament is disposed in a cap of sintered metal. A time base circuit, actuated by the closing of a switch, connects the filaments to an electrical supply circuit after a predetermined delay. Subsequently, the time base circuit sequentially triggers the connection of the filaments to a measuring circuit, the storage in a memory of the value of the output signal of the measuring circuit and the display of this stored value, the disconnection of the supply circuit, and the illumination of an end of operation warning lamp. The value displayed is proportional to the amount of a constituent of an atmosphere diffused into the measuring cell. The apparatus can be used as a portable fire damp meter or explosimeter.

REFERENCES:
patent: 3237181 (1966-02-01), Palmer
patent: 4002429 (1977-01-01), Bartovsky et al.
patent: 4063447 (1977-12-01), Mathison

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