Electrode system for an electro-chemical sensor for measuring vapor concentrations
First Claim
1. An electrochemical sensor system comprisinga chemically inert non-conductive substrate,a plurality of electrically conductive segments isolated from each other mounted on said substrate,a plurality of differing ion conductive sensing materials covering respective ones of said segments,at least one electrically conductive uncoated segment mounted on said substrate and isolated from said plurality of segments,a nonaqueous electrolyte layer covering all of said segments on said sensing materials and on said uncoated segment to form a sorption/desorption medium,a semi-permeable membrane means covering said electrolyte layer and contacting said substrate along a peripheral area emcompassing said electrolyte anda plurality of electrical conductors having one end attached to respective ones of said segments and a second end extending externally of said substrate and said membrane means.
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Abstract
An electrode system for an electrochemical sensor has a plurality of electrically conductive sensing segments isolated from each other and mounted on a support substrate formed from a chemically inert encapsulation material. The sensing segments are unencapsulated and are each coated with respective ones of ion conducting sensing materials to characterize each of the segments except for one of the segments which is uncoated and is arranged to be used as a reference electrode. The outer surface area of the sensing materials and the reference electrode is coated with a layer of a nonaqueous electrolyte which serves as a sorption/desorption medium. The electrolyte, in turn, is covered by a semipermeable thin film membrane secured at its peripheral edge by an O-ring to the support to form a fluid seal. Electrically conductive leads are connected to respective ones of the sensing surfaces, and a temperature measuring device is provided in the electrode structure for temperature compensation.
112 Citations
10 Claims
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1. An electrochemical sensor system comprising
a chemically inert non-conductive substrate, a plurality of electrically conductive segments isolated from each other mounted on said substrate, a plurality of differing ion conductive sensing materials covering respective ones of said segments, at least one electrically conductive uncoated segment mounted on said substrate and isolated from said plurality of segments, a nonaqueous electrolyte layer covering all of said segments on said sensing materials and on said uncoated segment to form a sorption/desorption medium, a semi-permeable membrane means covering said electrolyte layer and contacting said substrate along a peripheral area emcompassing said electrolyte and a plurality of electrical conductors having one end attached to respective ones of said segments and a second end extending externally of said substrate and said membrane means.
Specification