| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a mass flowmeter that eliminates a harmful effect being caused by the existence of a bypass, can perform measurement even in the case of a large flow rate, suppresses an error by the influence of an ambient temperature, and is highly safe and inexpensive. SOLUTION: A flowmeter where one coil 8 for heating and detecting temperature is wound around a mass flow sensor pipe 6 has a temperature sensor 9 for detecting ambient temperature that is nearly the same as temperature before heating a measured fluid 1, an ambient temperature detection circuit 16 being connected to the temperature sensor 9, a coil temperature detection circuit 17 for detecting coil temperature, a coil-heating circuit 18 for controlling the coil temperature, and a flow-rate calculation circuit 19. The flowrate calculation circuit 19 calculates a flow rate, based on the temperature difference between the ambient temperature and the coil one and power or voltage being supplied to the coil 8.</p> |
