Abstract
The thermal air-flow sensor, which is heated to a temperature with a constant degree of difference ( Δt) from that of the gas, provides power consumption according to the flow rates. The flow signal output of the sensor decreases depending on the rise in ambient temperature. This effect is easily compensated by inserting two identical compensation resistors ( R com) in the Wheatstone bridge circuit without Δt change. This compensation is accomplished based on the influential change of ambient temperature on the sensor power consumption in proportion to the ratio of R com to the bridge resistor.
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