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Carbon Monoxide Sensor

TGS 2442 carbon monoxide sensor utilises a multilayer sensor structure. A glass layer for thermal insulation is printed between a ruthenium oxide (RuO2) heater and an alumina substrate. A pair of Au electrodes for the heater is formed on a thermal insulator. The gas sensing layer, which is formed of tin dioxide (SnO2), is printed on an electrical insulation layer which covers the heater. A pair of Au electrodes for measuring sensor resistance is formed on the electrical insulator. Activated charcoal is filled between the internal cover and the outer cover for the purpose of reducing the influence of noise gases. TGS 2442 displays good selectivity to carbon monoxide, making it ideal for CO monitors. In the presence of CO, the sensor's conductivity increases depending on the gas concentration in the air. A simple pulsed electrical circuit operating on a one second circuit voltage cycle can convert the change in conductivity to an output signal which corresponds to gas concentration. Features: low power consumpt