Thermal mass flow sensor with inclined bypass channel inlet

摘要

In a gas-flow measuring instrument for measuring a gas flow in an intake gas passage (8), deterioration and breakage of a flow measuring element caused by fluid and foreign materials contained in intake gas are reduced. A gas-flow measuring instrument disposed in an intake gas passage (8) includes a bypass (4) for bringing gas flowing along the intake gas passage (8), a bypass inlet (11) opened to the upstream side of a main stream direction (14) of gas in the intake gas passage (8), and a flow measuring element disposed in the bypass (4).