Patent ID: 7617724
Filing Date: 2009-11-17
Classification: G01F

Abstract:
1. A thermal mass flow meter comprising: a measuring unit configured by a heater chip used for heating a fluid inside a piping, the heater chip being placed on a peripheral face of the piping through which the fluid is allowed to flow, and paired temperature sensor chips, each of which is made of a chip-type temperature sensor chip formed as a member separated from the heater chip, the temperature sensor chips being placed at positions on an upstream side and a downstream side of the heater chip with equal distance apart therefrom, along a flowing direction of the fluid in the piping, on the same side as the heater chip with respect to the piping, on the peripheral face of the piping, each of the temperature sensor chips being coated with a molding resin on a surface thereof, with an input/output terminal extending sideward from a lower face side that corresponds to a face on a side having the smallest thermal resistance up to an element formed inside thereof among faces of the molding resin, each of the temperature sensor chips being anchored on the lower face side; and an operation unit used for finding a flow rate of the fluid flowing through the piping based upon a temperature difference in the paired temperature sensor chips.