Water Level Sensors



Design features such as multiple communication outputs (SDI-12 or 4 … 20 mA), stainless steel housing, and a rugged cable make this sensor ideal for monitoring water level in a variety of applications.

Application: Surface water, Groundwater
Measurement technology: Vented pressure cell
Parameters measured: Water level, Pressure, Temperature
Product Highlights: Water level and temperature measurement – for use with external data logger
Measurement range: 0 … 4, 10, 20, 40, and 100 m
Accuracy: ± 0.05% FS
Internal data logger: Yes

  • The robust ceramic pressure cell offers industry-leading accuracy and does not deform over time like membrane technology, providing long-term measurement stability
  • Rugged design: Ceramic pressure cell resistant to physical force (5 x burst pressure) and enclosure made of high-quality saltwater resistant steel for use in coastal environments
  • Built-in microcontroller – compensates for temperature effects and applies correction values for gravitational acceleration and water density
  • Vented pressure probe, automatically compensates for changes in barometric pressure
  • Robust cable with Kevlar core for length stabilization and capillary tube for venting
  • Simple setup and connection to external dataloggers using SDI-12 or 4 … 20 mA interfaces
  • Optimized resolution is achieved by assigning the 4 … 20 mA to that part of the measuring range that is actually required
  • Water temperature output in addition to water level (for SDI-12 output)


Water level measurement
Measurement range 0 … 4 m, 10 m, 20 m, 40 m, 100 m
SDI-12 ±0.05 % FS (linearity and hysteresis)
4 … 20 mA ±0.1 % FS (linearity and hysteresis)

10 ppm/°C at 20 °C

Resolution (SDI-12) 0.001 m; 0.1 cm; 0.01 ft; 0.1 mbar; 0.001 psi
Temperature compensated working range -5 °C … +45 °C (ice-free)
Temperature measurement range -25 °C … +70 °C (ice-free)
Resolution 0.1 °C / 0.1 °F
Accuracy ±0.5 °C / ±0.9 °F
Electrical data
Available interfaces (use as required) 4 … 20 mA, SDI-12, RS485 (via SDI-12 protocol)
Supply voltage +9.6 … +28 V DC, typically 12/24 V DC
Power consumption (SDI-12)
Sleep  <600 mA
Active  <3.6 mA
Pressure sensor (capacitive pressure sensor) ceramic, temperature compensated, overload safe for up to 5 times the measuring range without permanent mechanical damage
Temperature sensor NTC
Dimensions 195 mm x 22 mm
Weight approx. 0.3 kg
Environmental conditions
Operating temperature -25 … +70 °C
Storage temperature -40 … +85 °C
Housing stainless steel 1.4539 (904L) resistant to sea water
Seals Viton
Cable jacket PUR
Protection type IP68
Mechanical Strength meets the mechanical shock tests of IEC 68-2-32
EMC limits CE conformity; EN 61000-4-2/3/4/5/6 and EN 61000-6-3 Class B are adhered to

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