Thermosetting flowmeter

摘要

An object of the present invention is to obtain a highly accurate thermosensitive flowmeter in which flow rate characteristic errors and temperature characteristic errors of a flow rate signal voltage are small. According to the present invention, flow rate characteristic errors and temperature characteristic errors of a thermosensitive resistor caused by trimming adjustment made on the thermosensitive resistor can be reduced by providing unvaried profile of heating area on the thermosensitive resistor. Bridge balance is adjusted so that the heat value of the thermosensitive resistor correspond with predetermined value, and gain of amplifier is adjusted so that the flow rate signal voltage correspond with predetermined value.