| 摘要 |
<p>PURPOSE:To hold the temperature in an element constant and to eliminate variance in output characteristics due to resistance adjustment by providing a resistance adjustment zone in the center of the heating part of a resistance body. CONSTITUTION:A flow sensor element 3 is arranged in a flow passage tube and the resistance body 2 is applied with a voltage so that a flow velocity detection part is a constant temperature higher than the temperature of fluid. Then the flow velocity of the fluid is found from heating value absorbed by the passage of the fluid in the flow passage tube. At this time, the resistance adjustment zone in the flow sensor element 3 is arranged in the center of the heating part 5 of the resistance body 2, so the temperature distribution in the element becomes constant without reference to whether or not the resistance adjustment is made and the variance in output characteristics due to the resistance adjustment can be eliminated. Further, variance among elements is eliminated and the flow velocity can be detected symmetrically about the flow direction without reference to whether the fluid flows to the element from the right or left.</p> |
