Solid electrolyte gas sensor and method of measuring concentration of gas to be detected in gas mixture.

摘要

A solid electrolyte gas sensor and a method for the measurement of a concentration of a gas to be detected in a gas mixture. The sensor has (A) a screen for controlling a permeation rate of the gas, which comprises (a1) a first solid electrolytic membrane selectively permeable to ions derived from a specific gas, and (a2) a plurality of first porous conductors being present on both front and reverse surfaces of the first solid electrolytic membrane and electrically connected with each other so as to give a potential required for oxidation and reduction of the gas, and (B) a detection portion for detecting a permeation amount of ions derived from the gas, which comprises (b1) a second solid electrolytic membrane, (b2) a plurality of second porous conductors, and (b3) means of electrically measuring an amount of ions derived from the gas which permeates the second solid electrolytic membrane. The amount of ions which permeate the first solid electrolytic membrane of the above screen (A) per unit time is smaller than an amount of ions which permeate the second solid electrolytic membrane of the above detection portion (B) per unit time under conditions that the sensor is in operation; and all of ions which permeate the second solid electrolytic membrane of the above detection portion (B) are those which have permeated the first solid electrolytic membrane of the above screen (A). <IMAGE>