Filament drive circuit

Details Filament drive circuit Filament drive circuit

1988-01-04

1989-05-16

Levy, Stewart J.

Measuring and testing

Gas analysis

By vibration

73 19, 422 96, 338 34, G01N 2718

Patent

active

048298107

ABSTRACT:
An apparatus and a method is provided for determining the equilibrium of the partial pressures of two gases having different thermal conductivities. The apparatus includes a single sensor adapter to be contacted by the two gases, and heated by a flow of electrical current through the sensor. A circuit is provided for maintaining the sensor at a constant level of electrical resistance and hence at a constant temperature. The sensor, in addition, is connected as one leg of a bridge circuit, the output of which represents changes occurring in the thermal conductivity of a mixture of the gases.

REFERENCES:
patent: 4222006 (1980-09-01), Schneider
patent: 4454748 (1984-06-01), Terai et al.
patent: 4498330 (1985-02-01), Hosoya
patent: 4533520 (1985-08-01), Bossart et al.
patent: 4735082 (1988-04-01), Kolloff
patent: 4741198 (1988-05-01), Farren et al.

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