A GAS SENSING SYSTEM

摘要

A gas sensing system (10) for the detection of gas concentrations in a flowable medium has a gas permeable membrane structure (60) to separate the flowable medium from a chamber (84) where a gas sensor (50) is positioned for detecting the gas concentration in the chamber (84). The sensor (50) has predetermined environmental operating ranges and the system (10) has a heat drain (86) with a heat sink (54) to maintain the temperature of gas in the chamber within the operating ranges, together with gas nozzles leading into the chamber (84) to purge gas from the chamber (84) and maintain the gas concentration from exceeding the sensor operating range.