| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermal type flowmeter that prevents pollutants from adhering to a flow rate detecting part.SOLUTION: A thermal type flowmeter 300 of the present invention comprises: a sub-passage for flowing gas 30 to be measured taken from a main passage 124; and a flow rate detecting part 602 for measuring a flow rate of the gas 30 to be measured, by heat transfer with the gas 30 to be measured flowing in the sub-passage via a heat transfer surface 437. The flow rate detecting part 602 is provided so as to be exposed to a support surface 402 where the flow rate detecting part is mounted that is disposed in a flow direction of the gas 30 to be measured in the sub-passage. The support surface 402 is provided with a guide part 461 that extends sloping to the flow direction of the gas 30 to be measured and that guides pollutants flowing along the support surface 402, in a position that is upstream of the flow rate detecting part 602. |
