Pseudo-continuous process for interrogating a combustible gas detector
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United States of America Patent
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Aug 10, 1993
Grant Date -
N/A
app pub date -
Oct 7, 1991
filing date -
Apr 6, 1989
priority date (Note) -
Expired
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Abstract
To measure the concentration in a gaseous medium of a known combustible gas a resistive element in the gaseous medium having a catalytic surface or being sensitive to variations in the concentration of the combustible gas in the gaseous medium is electrically heated, the value of a parameter representative of the gas concentration is detected and there is deduced therefrom, using a conversion law obtained previously by calibration, a measurement of said concentration. The element is heated periodically in cycles comprising a heating phase, a second phase in which the intensity I is controlled in such a way as to maintain the resistive element at a set point temperature and the stabilized value of the voltage U at the terminals of the detector is measured, and a third phase in which the heating power is reduced. On average the power of the electric current flowing during the second phase is substantially less than the heating current power.
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