Vacuum pressure switch

Vacuum pressure switches measure the pressure at the pressure inlet of the sensor. With the aid of a pressure measuring cell installed in the sensor, the overpressure or underpressure applied to the sensor is compared with the prevailing ambient pressure (relative pressure measuring cell) and output as an electrical signal. A vacuum pressure switch often detects whether an applied vacuum is above or below a defined switching threshold and outputs this information as a binary, electrical signal. However, the electrical output is also possible as an analog signal proportional to the applied pressure. 

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Air flow sensors

Flow sensors measure the flow rate of liquid or gaseous media. They are used to monitor the volume or mass flow through a control system. Simpler so-called flow transmitters map the physical measured variable to an electrical signal. The majority of flow sensors offer digital switching outputs or even digital and analog outputs. 

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