Thermal type flow rate detector

Details Thermal type flow rate detector Thermal type flow rate detector

2005-05-10

2005-05-10

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Volume or rate of flow

Thermal type

Reexamination Certificate

active

06889544

ABSTRACT:
A thermal type flow rate detector includes: a bridge circuit constructed by upstream side and downstream side temperature detecting elements for detecting a temperature of fluid flowing from the upstream side to the downstream side, and fixed resistors; and a temperature difference controlling circuit for continuously supplying an electric power to upstream side and downstream side heat generating elements so that a temperature difference between the temperature detecting elements becomes a predetermined value. The temperature difference controlling circuit includes: a differential amplifier connected to the bridge circuit; a first constant voltage power supply; a second constant voltage power supply having a lower constant voltage than that of the first constant voltage power supply; and the upstream side and downstream side heat generating elements.

REFERENCES:
patent: 5965813 (1999-10-01), Wan et al.
patent: 6349596 (2002-02-01), Nakada et al.
patent: 6470741 (2002-10-01), Fathollahzadeh
patent: 10-500490 (1998-01-01), None
patent: 11-326003 (1999-11-01), None

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