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It is demonstrated how a commercially available MEMS thermopile infraredradiation sensor can be used as thermal conductivity gas detector (TCD).Since a TCD requires a heater while IR-thermopile sensors have no integratedheater, the thermopile itself is used as heater and temperature sensor atthe same time. It is exposed to the measured gas environment in its housing.It is shown that, by using a simple driving circuitry, a mass-produced low-cost IR sensor can be used for hydrogen detection in applications such ashydrogen safety and smart gas metering. The sensor was tested to measurehydrogen in nitrogen with concentration of 0–100 % witha noise equivalent concentration of 3.7 ppm

A new low-cost hydrogen sensor build with a thermopile IR detector adapted to measure thermal conductivity