| 摘要 |
PROBLEM TO BE SOLVED: To provide an air flow measuring device including a physical quantity measuring sensor other than a flow sensor, and capable of suppressing adhesion of dust to the physical quantity measuring sensor.SOLUTION: An air flow measuring device 1 comprises: a housing 2 that includes a bypass flow passage 7 capturing part of air flowing within a duct D; a flow sensor 3 provided within the bypass flow passage 7; and at least one physical quantity measuring sensor (for example, a humidity sensor 4) other than the flow sensor 3 for measuring a physical quantity of the air flowing within the duct D. The housing 2 includes a dead-end recessed portion 30 formed to be recessed in a flow passage inner wall surface of the bypass flow passage 7, and the physical quantity measuring sensor is disposed within the recessed portion 30. With this configuration, a flow of air is not actively generated in the recessed portion 30 and adhesion of dust to the physical quantity measuring sensor can be, therefore, suppressed by disposing the physical quantity measuring sensor within the recessed portion 30. |
