Hydrostatic Head

This is a very reliable method of liquid level measurement. In practice, the sensors measure the pressure of the column of liquid above the point of measurement.
It is a measurement of relative pressure, converted to meters of column of liquid and consequently into a level measurement. The level measurement is transmitted with a 2-wire, 4-20 mA technique.
This system is used in applications in the measurement of the level of:
– cisterns
– tanks and wells
– wells for water lifting
– level measurement in ground water
The installation is always from above. The suspension of the sensor, depending on the model, can be with a tube (rigid extension) or rope (flexible extension).