| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a thermal type flow-rate sensor with a high sensitivity regardless of a low-speed flow rate and a high-speed flow rate. SOLUTION: A sensor comprises two hot wires 21 and 22 which are aligned in parallel at the upstream and downstream sides of the flow of a fluid, resistors 31, 32, and 33 for constituting the hot wires and a bridge, and an operation means 4, where switching means 5 and 6 for connecting the two hot wires 21 and 22 in series or in parallel are provided.</p> |
