Thermistor flow sensor and related method

Details Thermistor flow sensor and related method Thermistor flow sensor and related method

1994-12-28

1996-02-20

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219501, 219505, 219504, 7320419, 7320418, 7320414, 604246, 374 39, 128692, H05B 102, G01F 168, A61B 502

Patent

active

054931002

ABSTRACT:
A fluid flow rate measuring apparatus having a thermistor exposed to a flow of fluid and a driver circuit operable in an initial constant-voltage mode, in which it applies a substantially constant voltage across the thermistor, and a subsequent constant-current mode, in which it applies a substantially constant current through the thermistor, such current corresponding to the current level at the end of the constant-voltage mode. A voltage sensor measures the resultant voltage drop across the thermistor, which is a direct measurement of the fluid flow rate and which is substantially insensitive to variations in ambient temperature.

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patent: 5119674 (1992-06-01), Nielsen
patent: 5359891 (1994-11-01), Yamamoto

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