Gas flow meter using a positive temperature coefficient thermistor as the sensor
1999; American Institute of Physics; Volume: 70; Issue: 10 Linguagem: Inglês
10.1063/1.1150018
ISSN1527-2400
AutoresSuman Chatterjee, Kamalendu Sengupta, H. S. Maiti,
Tópico(s)Advanced Sensor Technologies Research
ResumoPositive temperature coefficient (PTC) thermistor sensors have been used successfully for sensing and measurement of gas flow through a tube. Tuned detection technique using an ac signal is found to be a more efficient measuring circuit than the conventional dc Wheatstone bridge. Any particular sensor can be used to measure a wide range of flow rates using sensing heads of varying geometries. For a specific geometry, the plot of electrical voltage output against flow rate produces an “S” shaped curve which follows from the basic principles of heat transfer by both conduction and convection mechanisms.
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