| 摘要 |
A low-cost thermal flow meter that has good temperature characteristics and little variations. The thermal flow meter includes a sensor element including a heat-generating resistor and at least two temperature-measuring resistors disposed downstream and upstream. The sensor element is positioned in the flow of a measured medium. It also includes an adjusting means for adjusting a excess temperature (DeltaTh=Th-Ta) of the heat-generating resistor, which is the difference between the temperature (Ta) of the measured medium and the temperature (Th) of the heat-generating resistor. The adjusting means adjusts the excess temperature (DeltaTh) of the heat-generating resistor depending on the temperature of the measured medium such that the excess temperature becomes smaller as the temperature of the measured medium increases.
|
