Gas sensor and heater unit

摘要

There is provided a gas sensor capable of accurately controlling the temperature of the gas detecting electrode forming part of the gas sensor. At least a positive leg or a negative leg of he thermocouple is connected to a detecting electrode or a counter-electrode formed on a solid electrolyte substrate and either a positive leg or a negative leg of the thermocouple is made to serve as a conductor section adated to take out an output signal from the detecting electrode.