Alphasense Limited

Michael L Hitchman

John R Saffell

Darryl H Dawson

Migeun Park

Electrochemical sensor for determining analyte in the presence of interferent, particularly carbon monoxide in the presence of hydrogen. An electrochemical cell is designed so that current flow resulting from reference electrode potential shift caused by interferent cancels out the current flow caused by interferent at the working electrode. Another electrochemical cell corrects for interferent concentration using the potential difference between a reference electrode in contact with interferent and a referent electrode not affected by inteferent.

Electrochemical sensor for determining analyte in the presence of interferent and method of using the sensor

A gas sensor comprising an electrolytic cell having detecting and reference electrodes connected by a solid electrolyte. In a first embodiment, both electrodes comprise Ag CO and Ag RbI , and the electrolyte is Ag RbI , the reference electrode being in contact with a reference gas. In a second embodiment, the reference electrode is a silver electrode and no reference gas is needed. The sensor is operable at room temperature to measure CO concentrations, and is relatively unaffected by water vapor.

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Glasgow, United Kingdom

Michael L Hitchman