Hot wire type air-flow meter

Hot wire type air-flow meter

The utility model relates to a hot wire type air-flow meter which comprises a wheatstone bridge provided with a bridge arm consisting of a temperature resistor Rn and other three bridge arms consisting of other three precision resistors R1, R2 and R3 as well as an operational amplifier U2A; an outpu...

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1. Verfasser: CUI JIEZHONG
Format: Patent
Sprache:chi ; eng
Schlagworte:
MEASURING
MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL
METERING BY VOLUME
PHYSICS
TESTING
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creator CUI JIEZHONG
description The utility model relates to a hot wire type air-flow meter which comprises a wheatstone bridge provided with a bridge arm consisting of a temperature resistor Rn and other three bridge arms consisting of other three precision resistors R1, R2 and R3 as well as an operational amplifier U2A; an output end of the operational amplifier U2A is connected on the base electrode of a triode Q1, one bridge arm of the wheatstone bridge is connected at an inverting input end of an operational amplifier U2B, a reference voltage V1 is connected at a non-inverting input end of the operational amplifier U2B, a monolithic processor controlling unit U1 is also arranged at an input end of the operational amplifier U2B, a temperature sensor RH is connected on the monolithic processor controlling unit U1, and the monolithic processor controlling unit U1 transforms a temperature signal detected through the temperature sensor RH into a voltage signal and performs comparison to the voltage signal and the reference voltage V1, and t
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subjects MEASURING
MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUIDLEVEL
METERING BY VOLUME
PHYSICS
TESTING
title Hot wire type air-flow meter
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