OTT ecoLog 800 Water Level Logger

OTT ecoLog 800 Water Level Logger



Groundwater level and conductivity sensor with built-in datalogger and telemetry

The OTT ecoLog 800 is a self-contained system for measurement of water level, temperature, and conductivity in groundwater and surface water applications. The ecoLog 800 features a complete in-well solution for groundwater measurement and flexible remote data transmission options.
  • Surface water, Groundwater
  • Vented pressure cell and 4-electrode graphite conductivity cell
  • Waterlevel/Pressure, Water temperature, Conductivity
  • Measures, stores, and transmits water level and temperature data
  • 0 … 4, 10, 20, 40, and 100 m
  • ± 0.05% FS
  • Yes


  • Remote data transmission: receive data, status messages, and low power warnings from the office via SMS, FTP, HTTP, and e-mail, eliminating field visits for data download and troubleshooting
  • Complete in-well solution: all components are inserted into the groundwater well, eliminating the possibility of instrument vandalism
  • Battery life: up to 10 years with lithium batteries, alkaline options are also available. All batteries are field-replaceable without additional tools
  • Long-term accuracy: a robust ceramic pressure cell will not deform over time, and an accurate 4-electrode conductivity measuring cell provides outputs for salinity and total dissolved solids (TDS)
  • User-friendly interaction: only one program required to setup unit and download data, plus a simple infrared communication interface that provides easy on-site data download


Water level measurement  
Measuring range 0 ?… 4 m, 10 m, 20 m, 40 m, 100 m
Accuracy ±0.05 % FS
Long-term stability ±0.1 % / year FS
Resolution 0.001 m?/?0.1 cm?/?0.01 ft?/ 0.1 inch?/?0.0001 bar?/?0.001 psi
Units m, ft, inch, bar, psi, Pascal
Temperature measurement  
Measuring range -25 °C ?… +70 °C
Accuracy ±0.1 °C
Resolution 0.01 °C
Units °C, °F
Conductivity measurement  
Measuring range 0 … 2000 µS/cm
Accuracy ±1 µS/cm or ±0.5 % of measured value (whichever is higher)
Resolution 1 µS/cm
Units µS/cm, mS/cm
Measuring range 0.1 … 100 mS/cm
Accuracy ±0.01 mS/cm or ±1.5% of measured value (whichever is higher)
Resolution 0.01 mS/cm
Unit mS/cm
Electrical data  
Power supply  
Alkaline C cell 2 x 1.5 V
Or lithium type 1 x 3.6 V/13 Ah
Or lithium type 1 x 3.6 V/26 Ah
Battery life (hourly measurement, one transmission/day)  
Lithium battery (26 Ah) >10 years
Alkaline batteries > 1 year
Modem GSM Standard 850/900 MHz, 1800/1900 MHz, GSM (Quadband), GPRS
Antenna Built-in; robust and weather-proof, external antenna optionally available (SMA-m)
Communication interface Infrared (IrDA)
Data logger  
Measured value memory 4 MB, approx. 500,000 measured values
Sampling/storage interval 5 seconds … ? 24 hours
Installation ≥ 2″
System length 2.0 m ?… 200 m ±1% ±5 cm (cable length incl. communication unit and pressure probe)
Dimensions L x Ø  
Probe 317 mm x 22 mm
Communication unit 520 mm x 50 mm
Probe Approx. 0.43 kg
Communication unit Approx. 0.92 kg (incl. batteries)
Housing material  
Probe Stainless steel (DIN 1.4539, 904 L?)
Communication unit Aluminium, PA-GF
Environmental conditions  
Operating temperature -30 °C … +85 °C
Storage temperature – 40 °C …? + 85 °C
Type of protection  
Probe IP68
Communication unit IP67
EMC limits Acc. toEC 204/108/EC, ETSI EN 301 486-1/-7, EN 61326-1