Mechanical and electronic flow sensors

- May 14, 2018 -

The flow sensor works according to the principle of a spring piston: The piston is located in a valve seat in the housing and is lifted against the spring resistance by the flowing medium.

For digital signal output, the piston position is detected by an inductive sensor. However, for the analog output sensor, this position is detected by the magnetic sensor.


As the flow decreases, the spring resistance forces the piston back to its initial position. This ensures that the installation of the flow sensor is independent of position and prevents backflow.

The switch points can be easily set and fixed with stop screws. The sturdy mechanical design ensures that it can be used in harsh environments. These devices are maintenance-free.


The pressure sensor is to diffuse a Wheatstone bridge on a single crystal silicon wafer, and the pressure of the measured medium (gas or liquid) changes the resistance of the bridge wall (piezoresistive effect) to generate a differential voltage signal. This signal is converted to a standard analog signal or digital signal by a dedicated amplifier that converts the corresponding signal of the range.


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