Serviceline
Serviceline Industrial Sensors
Serviceline Explosion Protection

Measuring principle

The pressure in a liquid increases with increased filling height. This hydrostatic pressure is transmitted to the measuring cell via a stainless steel diaphragm. Foam, build-up, fluctuating electrical properties of the liquid and the container design do not affect the measurement values.


Operation mode

The fill level of a liquid can be determined by the hydrostatic pressure if the density is known. The piezoresistive measuring cell is coupled to the measuring liquid via a stainless steel isolation membrane and diaphragm seal.

The value of the measuring cell can be converted via a signal conditioner into one of the following output signals:

  • 4 ... 20 mA analog signal
  • 4 ... 20 mA analog signal with HART
  • PROFIBUS PA digital signal 


The pressure sensors are available in the following versions:

  • Externally mounted type
  • Rod type
  • Suspended type

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