OTT Orpheus Mini Water Level Logger

Pressure level transducer with datalogger for longterm groundwater monitoring

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 The OTT Orpheus Mini is an integrated pressure sensor and datalogger for level measurement in surface and groundwater applications. 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. The Orpheus mini can be paired with the OTT ITC for remote data transmission.

  • Surface water, Groundwater
  • Vented pressure cell
  • Waterlevel/Pressure, Water temperature
  • Measures and stores water level and temperature data
  • 0 … 4, 10, 20, 40, and 100 m
  • ± 0.05% FS
  • 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

Examples of Use

For continuous or continuous real-time water level measurement of:

  • Streams, rivers, channels, or canals
  • Groundwater wells
  • Reservoirs, lakes, and wetlands

Ideal for monitoring:

  • Continuous water level networks
  • Short-term or long-term
  • Events
  • Pump tests
  • Landfill groundwater levels


White Paper – OTT ecoLog Guidance: Remote communication via mobile networks
OTT Orpheus Mini – CE Konformitätserklärung | Declaration of Conformity | Declaration de Conformité
Brief instructions Groundwater Datalogger OTT Orpheus Mini
Operating instructions Groundwater Datalogger OTT Orpheus Mini
Brochure – OTT Ground water measurement
Leaflet – Groundwater datalogger OTT Orpheus Mini
Technical Note – Sensor Selection Guide Groundwater
White Paper – OTT ecoLog Guidance: Remote communication via mobile networks
Orpheus Mini – Firmware – EN
USB interface drivers – OTT IrDA-Link USB – EN
OTT Water Logger Operating Program

Technical Data

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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