Hot Film Air Flow Meter
The working principle of the hot film air flowmeter is similar to that of the hot wire air flowmeter, both of which work with a Wheatstone bridge. The difference is that the hot film type does not use platinum wire as the hot wire, but the hot wire resistance, compensation resistance and bridge resistance are made on the same ceramic substrate by thick film technology.
Target Air Flow Meter
When the air flows in the measuring tube, the pressure difference between its own kinetic energy and the target piece will generate a force on the target piece, causing the target piece to produce a slight displacement. The magnitude of the force is proportional to the square of the medium flow rate. , The force on the target piece is transmitted through the target rod to cause a slight change in the elastic body of the sensor, and after the circuit conversion, the corresponding electrical signal is output.