Hydrostatic Level Transmitters

  • Application
    Water well, Process fluids, Wastewater
  • Measurment Range
    0-3 m, 0-30 m, 0-100 m, 0-300 m
  • Output
    Analogue 4-20 mA
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The water level transmitters are designed for measurement under rough conditions in all water and wastewater applications with large concentrations of sludge and suspended solids. 

Our level transmitters have a sturdy design with housing in re-enforced plastic or stainless steel. Cables are insulated with PUR, and steel reinforced to achieve very high tensile strength. Sensing membranes are made with either ceramic or stainless steel. Outputs are analog two-wire 4-20 mA, voltage or digital Modbus RTU.

The Expert Hydrostatic Level Transmitters line consist of these product types:

  1. Expert Hydrostatic Analogue Submersible Level Transmitters
  2. Expert Hydrostatic Digital Submersible Level Transmitters
  3. Level Transmitters for clean water applications
  4. Level Transmitters for waste water applications


Hydrostatic level transmitters

Measuring ranges from  0 to 0,3 m to 0-300 m
Measurement principle 

Piezo resistive or capacitive ceramic measuring cell

Temperature range 

-10 … + 70 °C

Temperature Drift 

 zero down to  0,02 % / °C


- 20 to + 60 °C

Temperature Operation 

span down to ≤ 0,01 % / °C

Measuring range accuracy 

≤ 0,2 % FS

Max. Operating 

≤ 0,1% FS / year

Output Signals  Analogue 4-20 mA voltage or digital Modbus RTU

Diameter from Ø16 mm to Ø60 mm

Materials, house 

AISI 316, PP or PPS

Materials membrane  Acid proof steel or ceramic 99.9% pure AL2O3
Measuring cell seals  Viton or silicone
Supply voltage  12 - 30 V DC
Output  4 - 20 mA, 0,1 - 1V or Modbus
Cable  2 x 0,5mm2, shieldedt (+ 5 x 0,15mm2)
Length  12 m, or by request
Enclosure  IP68, waterproof
Approvals  CE: EN50081-1, EN50082-1
II 2G Ex ia IIC T6 (-20°C≤Ta≤40°C)
II 2G Ex ia IIC T5 (-20°C≤Ta≤50°C)
II 2G Ex ia IIC T4 (-20°C≤Ta≤80°C) 
UL: Class I, Division 1, Group A-D T4/T5/T6
       Demko 06 ATEX 137949X

Hydrostatic transmitters are used everywhere - even in some very harsh environments:

Waste water:

For level measurement in tanks with sewage, storm flow basins, aeration tanks, sludge thickeners and have enough precision for level measurement for open channel flow measurement.

Drinking water:

Level measurement in water wells and tanks, level control in water towers, filter pools, ion exchangers and chemical mixing/precipitation tanks.


Level measurement in tunnels, mines and dewatering under larger buildings.


Measurement in all types of process tanks where with access from the surface, even in hazardous areas.