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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) 


Infrared (IrDA)

Data Logger 



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)


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


100 %

Type of protection


Communication unit

IP67 (immersion depth max. 2 m
duration of immersion max. 24 h)

Pressure probe


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

Related Categories
Water Level Sensors