AF903Pressure level transmitter

  • Suitable for drinking water

  • 0.5 bar / 10m cable

  • Analogue output
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  • Suitable for measuring the level of water, water-based media, drinking water
  • The submersible pressure transmitter is lowered to the bottom of the vessel
  • Measuring range 0...0.5 bar/ 0...5 mH2O
  • The relative pressure measuring cell ensures an accurate analogue signal and good long-term stability
  • Pressure compensation with the ambient pressure by means of a capillary tube integrated in the connection cable with a filter to protect against tube clogging

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Everything about autosen


Submersible pressure transmitters are ideal for level measuring in vessels, waste water systems and wells. The AF903 submersible pressure transmitter is lowered into the vessel together with the cable and measures the hydrostatic pressure of the water column. The actual level is determined in this manner. AF903 has a 10 m long cable and can measure levels of up to 5 mH2O. The submersible pressure transmitter is suitable for drinking water applications, waste water and aggressive media.

The AF903 submersible pressure transmitter demonstrates excellent impermeability at large immersion depths. The stainless steel housing is very robust and boasts a high-quality finish. The relative pressure measuring cell measures the hydrostatic pressure of the water column and converts it into a 4...20 mA signal. A capillary tube is integrated in the connection cable and is used for atmospheric pressure compensation. A filter protects the open end of the tube against clogging. The filter and the cap are included in the scope of delivery.

The ends of the cable are ideally assembled in a watertight junction box or directly in the control cabinet. When assembling, make sure the capillary tube is not kinked, otherwise there will be no pressure compensation. Special autosen cable clamps can be used during assembly to prevent this from happening. Accessories, technical data sheets and further information can be found further down the page.

Technical data AF903

General information

Water, water-based media, suitable for drinking water
Immerge level transmitter with cable to the ground;
alternatively installation in 1-inch tube
0...0.5 bar / 0...5 mH2O

Outputs / inputs

4 ... 20 mA

Electrical data

500 V DC
10 ... 30 V DC
Direct voltage (DC)
20 mA
< (supply voltage - 7 V) / 0.02 A

Mechanical data

V4A (1.4404)
Al2O3 (ceramic)
Al2O3 (ceramic)
V4A (1.4404)
Open cable
10 m


0,2 % FS*
± 0.8 % FS*
incl. zero point, full scale, linearity, hysteresis and repeatability
± 0.5 % FS* / 10K
± 0.25 % FS*
*FS: Fullscale

Ambient conditions

3 bar
-20 ... 80 °C °C

Additional information

1 protection cover
1 protective filter for the ventilation pipe
EN 61326-2-3


CASE = case grounding
Data sheet
Customer reviews
We use for amusement rides. The quality is good.
10/25/2022 2:23:37 PM
Über den Sensor wird der Füllstand des Tanks an ein spezielles Steuergerät übermittelt, das das Signal an eine Online-Stelle weiterleitet.
12/11/2023 1:23:37 PM
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