Water Level Sensors


Orpheus Mini

It features a robust ceramic measuring cell for long term accuracy and its built in datalogger manages and stores all measurements at user-programmable intervals.

Application: Surface water, Groundwater
Measurement technology: Vented pressure cell
Parameters measured: Water level/Pressure, Water temperature
Product Highlights: Measures and stores water level and temperature data
Measurement range: 0 … 4, 10, 20, 40, and 100 m
Accuracy: ± 0.05% FS
Internal data logger: Yes

  • Accurate– Ceramic pressure cell, unlike membrane technology, will not deform over time providing long-term measurement stability
  • High Performance– Mechanical resistance to pressure overload and corrosive waters
  • Complete Solution– Pressure sensor with built-in data logger manages and stores pressure, depth to water, water level (stage), and/or temperature measurements at programmable intervals
  • Flexible Installation– Easily installs in wells or pipes of 1 in. diameter or larger with use of convenient adapter plates
  • Simple Maintenance– Infrared interface, batteries, and desiccant are accessible at the top of the well or pipe and no tools are required


Waterlevel measurement
Measuring ranges 0 … 4 m, 10 m, 20 m, 40 m, 100 m
Accuracy, pressure sensor ± 0.05 % FS
Resolution, pressure sensor 0.01 % FS
Temperature measurement
Measuring range temperature -25 °C … +70 °C (ice-free)
Accuracy temperature ± 0.5 °C
Resolution temperature 0.1 °C
Electrical data
Power supply 3 x 1.5 V LR6-cells Alkaline- or Lithium-type
Lifetime (at 1 h reading interval)
with Lithium batteries min. 5 years
with Alkaline batteries min. 1.5 years (high quality battery types)
Interface Infrared (IrDA)
Data Logger
Memory 4 MB non-volatile
Number of measured values approx. 500,000
Reading interval 1 second… 24 hours
Storage interval 1 second …24 hours
Logging type – selectable linear, logarithmic – free progammable (logging table) for pumping tests , event triggered delta data logging
Installable in well pipes ≥ 1″
System length 1.5 … 200 m ±1% ±5 cm (cable length incl. communication unit/pressure probe)
Material ABS, POM, 904 L (DIN 1.4539)
Communication unit (incl. batteries) approx. 0.410 kg
Pressure probe approx. 0.300 kg
Communication unit L x Ø 400 mm x 22 mm
Pressure probe L x Ø 195 mm x 22 mm
Operating Conditions
Temperature-compensated working range -5 °C … +45 °C (ice-free)
Storage temperature -40 °C … +85 °C
Operating Temperature -20 °C … +70 °C
Humidity 100 %
Type of protection
Communication unit IP67 (immersion depth max. 2 m

duration of immersion max. 24 h)

Pressure probe IP68
EMV limits IEC61326/EN61326 are compliant with EN 61000-4-2, EN 61000-4-3, EN 61000-4-4, EN 61000-4-5, EN 61000-4-6, EN 550222 class B

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