Patent ID: 6129825
Filing Date: 2000-10-10
Classification: G01N

Abstract:
An electrochemical gas sensor for detection of a gas in an atmosphere containing the gas, said sensor comprising a leak-proof sealed housing formed at least in part from a first conductive plastic member, a second conductive plastic member and a plurality of non-conductive plastic members, the housing containing a fluid electrolyte and a first electrode having a periphery sandwiched between said first conductive plastic member and one of said non-conductive plastic members, and a second electrode having a periphery sandwiched between said second conductive plastic member and another of said non-conductive plastic members, each of said first and second electrodes comprising a membrane formed from a fluoropolymer film having a layer adhered thereto of a catalyst-impregnated fluoropolymer, said layer of each of said first and second electrodes being bonded to the respective first and second conductive plastic members, said layers of said first and second electrodes being separated by an absorbent material having said fluid electrolyte absorbed therein, said absorbent material extending between the first conductive plastic member bonded to the layer of the first electrode and the second conductive plastic member bonded to the layer of the second electrode, the absorbent material being in fluid flow communication with a reservoir of said fluid electrolyte, the first and second conductive plastic members bonded to said first and second electrodes being connected to means for detection of current passing through said electrodes.