Measuring arrangement for detecting the level of combustible gas

Details Measuring arrangement for detecting the level of combustible gas Measuring arrangement for detecting the level of combustible gas

1987-06-30

1989-04-04

Chapman, John

Measuring and testing

Gas analysis

By thermal property

G01N 2712

Patent

active

048174149

ABSTRACT:
A measuring arrangement for detecting the level of combustible gases mixed with air such as methane in air includes a measuring sensor responsive to the heat-conductivity of the proportion of the gas to be detected. The effect of the ambient temperature on the heat-conductivity measurement is eliminated through a simple circuit configuration consuming low power for a measurement of heat-conductivity alone as well as for such a measurement in combination with a reaction-heat measurement. For this purpose, the heat-conductivity sensor is connected to a constant-current source. A measuring takeoff circuit for the heat conductivity is connected in parallel to the heat-conductivity sensor and is provided in the form of a series circuit including a measuring signal terminal and a compensating voltage source. The compensating voltage source generates a compensating voltage which changes in magnitude and direction in correspondence with the temperature-dependent change in the voltage drop across the heat-conductivity sensor.

REFERENCES:
patent: 3091957 (1963-06-01), Hampton
patent: 3519391 (1970-07-01), Winter et al.
patent: 4498330 (1985-02-01), Hosoya
patent: 4571543 (1986-02-01), Raymond et al.
patent: 4572900 (1986-02-01), Wohltjen

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