| 摘要 |
<p>PURPOSE:To attain to enhance assembling workability and accuracy by eliminating the variation in an air stream due to the irredularity of a holder attaching position, by forming a part of a bypass passage to a part of the holder of a hot wire and a cold wire. CONSTITUTION:The supply of a current to a hot wire 1 and a cold wire 2 is controlled by the operation of a drive circuit 7 so as to make the difference between the temps. of both wires 1, 2 constant. In this case, if the relative mount position of the wire 1 to a bypass passage 6b is shifted, the characteristic thereof changes to become difficult to adjust. However, by providing a ring shaped member 3a forming a part of the passage 6b to a part of a holder 3, the relative mount position of the wire 1 to the member 3a is not shifted even if the mount position of the holder 3 to the passage 6b become irregular. Therefore, a characteristic becomes stable and adjustment becomes simple and measurement can be performed with high accuracy.</p> |
