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A readout system for pellistors with pulsed thermal feedback

: Leman, O.; Srivastava, M.; Hauer, J.


Arregui, F.J. ; Institute of Electrical and Electronics Engineers -IEEE-:
IEEE Sensors 2014. Proceedings : Valencia Conference Centre, Valencia, Spain, Tutorials: November 2, 2014, Conference: November 3-5, 2014
Piscataway, NJ: IEEE, 2014
ISBN: 978-1-4799-0161-6
ISBN: 978-1-4799-0162-3
ISBN: 978-1-4799-0160-9
Sensors Conference <13, 2014, Valencia>
Fraunhofer IIS ()

Catalytic flammable gas sensors are used for safety in places where the accumulation of flammable gasses can generate a blast. These devices measure the flammable gas concentration via the heat produced by the catalysis of the gas by a heated catalytic coating. We propose the design and implementation of a readout system based on feedback heat pulses. In the proposed system, the heat of catalysis is directly measured via its compensation by a controlled feedback heat power. Contrary to that proposed sensor operation, previous potentiometric schemes would measure a sensor temperature increase resulting from the heat of catalysis. This proposed readout scheme for so-called "pellistor" sensors is expected to improve the measurement performance while providing a simpler implementation than previous systems.