Air flow sensor and detecting method
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United States of America Patent
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May 25, 1993
Grant Date -
N/A
app pub date -
Mar 18, 1991
filing date -
Mar 18, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
A pair of thermistors are mounted in a tube which diverts a minor portion of the air flowing through a duct of an HVAC system. One thermistor is heated by a feedback control system to maintain a substantially constant temperature differential between the thermistors. A signal representing the flow velocity is detected by detecting the power which is applied to the heating body to maintain the constant differential. That power represents the thermo power being carried away from the heated body. The temperature of the unheated thermistor is also detected. The signals are converted to digital form and applied to a computer for computing the flow rate in the ducts.
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