Method and apparatus for sensing combustible gases employing and

Details Method and apparatus for sensing combustible gases employing and Method and apparatus for sensing combustible gases employing and

1994-09-23

1996-05-28

Snay, Jeffrey R.

Chemistry: analytical and immunological testing

Measurement of electrical or magnetic property or thermal...

By means of a solid body in contact with a fluid

436136, 436137, 422 88, 422 90, 422 94, 422 98, 73 2331, 73 3101, G01N 2712

Patent

active

055210996

ABSTRACT:
A combustible gas sensor having a noble metal sensor element with a surface that is heated above a critical temperature at which the surface is able to dissociate oxygen in a gas stream and adsorb the oxygen onto its surface. The adsorbed oxygen present on the noble metal surface enhances the reactivity of the sensor element and permits it to react with combustible gases that otherwise would have little or no affinity for the sensor element. The balance of adsorbed oxygen and combustible gas species on the sensor surface cause a change in an electrical property that is used to determine the presence or identity of a combustible gas, or to derive a concentration measurement. The electrical property measured to determine the presence, identity, or concentration of combustible gas includes the work function of the noble metal surface, which may be measured by incorporating the sensor element as a component of a variable capacitor contained in an electrical circuit adapted to measure change in current caused by the change in capacitance of the variable capacitor.

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