| 摘要 |
An object of the present invention is to provide a structure which prevents a particulate contaminant and a liquid contaminant on which centrifugal separation hardly works, from arriving at a sensor element part. In order to attain the above described object, in a heat resistor type air flow rate measuring device which includes an auxiliary passage (402) taking in a part of a fluid flowing in a main passage, and a plate-shaped sensor element (303) installed in the aforesaid auxiliary passage (402) and for detecting a flow rate of the fluid, and is a heat resistor type flow rate measuring device having an auxiliary passage (402) formed along a curved line at 90° or more in an auxiliary passage portion at an upstream side from the plate-shaped sensor element (303), the aforesaid auxiliary passage (402) is formed along a curved line at 90° or more on a phantom plane orthogonal to a sensor formation surface of the plate-shaped sensor element (303) and parallel with a flow, and a sensor formation surface side and a rear side of the plate-shaped sensor element (303) have gaps from an auxiliary passage wall surface. |
