Electrochemical gas sensor and mounting structure therefor

摘要

A sensor body of an electrochemical gas sensor having no water reservoir is housed in a metal can including a sensing electrode on one surface of a proton-conducting membrane or a separator retaining an electrolyte and a counter electrode on the opposite surface thereof. The counter electrode is supported by and electrically connected to the metal can via a connecting member. The sensing electrode is connected to a diffusion control plate with the sensing electrode-side ring member, and the ring member is conductive and includes a hole at a center thereof that is connected to a hole of the diffusion control plate.

主权项

1. An electrochemical gas sensor having no water reservoir, the electrochemical gas sensor comprising:
a sensor body including a sensing electrode on one surface of a proton-conducting membrane or a separator retaining an electrolyte, and a counter electrode on an opposite surface thereof; a metal can housing the sensor body and including a bottom inner surface opposing the counter electrode; a connecting member disposed between the metal can and the counter electrode so as to support the counter electrode by the metal can and electrically connect the metal can and the counter electrode to each other; a diffusion control plate made of metal, the diffusion control plate opposing the sensing electrode and including a diffusion control hole; and a sensing electrode-side ring member disposed between the sensing electrode and the diffusion control plate, the sensing electrode-side ring member being a conductive ring member including a hole at a center or approximately at a center thereof, connected to the diffusion control hole and having a larger diameter than the diffusion control hole.