| 摘要 |
<p>A flowmeter includes a heating resistor and a resistive element for detecting the temperature of the heating resistor. The heating resistor is controlled so that the temperature detected by the resistive element approaches a reference temperature determined based on the temperature of the fluid flow. As a result, the temperature of the upstream side of the heating resistor becomes lower than the reference temperature, while the temperature of the downstream side of the heating resistor becomes higher than the reference temperature. Another resistive element is arranged on the upstream side or the downstream side of the heating resistor for detecting the rate of the fluid flow, and the rate and the direction of the fluid flow are detected by comparing the temperature of the resistive element with the reference temperature. This flowmeter is immune to variation in the resistance of the heating resistor.</p> |
