Glossary

Pressure sensor

Unit mbar

What is Pressure sensor?

Level sender that measures the hydrostatic pressure of the liquid column above it. The filling height follows from the pressure and the density of the medium.

What matters about Pressure sensor in practice?

It works without moving parts and is therefore resistant to wear, even in black water. Venting the reference side is important: without it, air pressure distorts the measurement.

The density of the medium has a direct effect. A sensor calibrated for water shows a different value in diesel, which must be taken into account during setup.

How does a pressure sensor measure the level?

The sensor lies on the tank bottom or sits low in the tank wall. The higher the liquid, the greater the pressure on its measuring cell. So that only the liquid's pressure counts and not the weather, the back of the measuring cell is vented to the outside air. The electronics pass the value to the gauge as a resistance, voltage or current signal.

What is a pressure sensor suitable for?

For fresh water, grey water and black water, because there are no moving parts to foul. The TDS and TDT pressure sensors are also suitable for diesel, but not intended for petrol. Which sensor suits which tank is shown on the page tank monitoring on board.

What if the reading is wrong?

  • Check that the vent is clear and the cable is not kinked.
  • Set the gauge for the medium: diesel is lighter than water and otherwise reads too low.
  • Calibrate irregularly shaped tanks in several steps: empty, quarter, half, three quarters and full.

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