GAS DETECTOR WITH TEMPERATURE COMPENSATING FUNCTION FORELECTROCHEMICAL GAS SENSOR

摘要

PURPOSE:To detect gas at an accurate concentration by performing the temperature compensation of an electrochemical gas sensor through a simple constitution having a decreased number of components. CONSTITUTION:The gas detector comprises a current/voltage conversion amplifier 3A for amplifying the sensor current Is from an electrochemical gas sensor 1 while converting the sensor current Is into a corresponding voltage signal and delivering a voltage signal Vs from the output terminal T thereof. The current/voltage conversion amplifier 3A comprises a thermister 7 for varying the amplification factor of the voltage signal Vs depending on the temperature variation of the gas sensor 1. The voltage of the voltage signal Vs is corrected to a level corresponding to the gas concentration of the gas sensor 1 at a predetermined temperature.