Gas sensing apparatus

Details Gas sensing apparatus Gas sensing apparatus

1988-05-24

1990-01-30

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204426, 204427, 204428, G01N 2746

Patent

active

048971740

ABSTRACT:
Apparatus for measuring the concentration of oxygen in exhaust gases. A gas sensor element of yttria-stabilized zirconia (Y.sub.2 O.sub.3 -ZrO.sub.2) has at one end a gas pump of two chambers separated by intervening Y.sub.2 O.sub.3 -ZrO.sub.2 with an orifice extending between each chamber and the exterior of the gas sensor element. Two platinum electrodes of a first set face one chamber and two platinum electrodes of a second set face the other chamber. The gas sensor element is mounted in an insulating mounting collar in close contact with two ceramic heaters of resistance heating elements on silicon nitride substrates. The mounting collar is clamped between a shield member encircling the gas pump of the sensor element and a housing member by threaded clamping nuts. The shield member has one or more apertures therein to admit exhaust gases to be analyzed to the gas pump of the sensor element. The housing member has an electrical connector at one end which is spaced from the sensor element for providing electrical connections to the sensor element and the ceramic heaters.

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