Carbon monoxide sensor with reduced hydrogen cross sensitivity

摘要

A gas sensor in one form comprises a housing including a base and a top defining an interior space. The housing includes a gas entry hole and first and second electrical terminals. First and second electrodes in the housing interior space each comprise a membrane having a layer of platinum black catalyst on one side. The second electrode includes a lower amount of platinum black catalyst than the first electrode. A separator is placed between the first and second electrodes. Current collectors electrically connect the first and second electrodes to the respective first and second electrical terminals whereby sensor current represents concentration of gas while minimizing cross sensitivity.

主权项

1. A carbon monoxide sensor with minimal hydrogen cross sensitivity comprising:
a base comprising a bottom wall and a cylindrical side wall to define an interior space, the base including first and second electrical terminals; an electrode stack in the housing interior space comprising concentric circular stack layers including a counter electrode, a sensing electrode and a thin separator layer between the counter electrode and the sensing electrode, the counter electrode comprising a membrane having a layer of platinum black catalyst, and the sensing electrode comprising a membrane having a layer of platinum black catalyst, wherein the counter electrode includes a lower amount of platinum black catalyst than the sensing electrode; current collectors electrically connecting the counter and sensing electrodes to the respective first and second electrical terminals whereby sensor current represents concentration of carbon monoxide; and a top connected to the cylindrical sidewall to close the interior space and including a gas entry hole.