OTT ecoLog 500 Water Level Logger

Water level sensor with built-in datalogger for surface and groundwater applications

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The OTT ecoLog 500 is a complete system for water level and temperature measurement. Designed for full deployment inside groundwater wells as well as surface water applications, the OTT ecoLog 500 offers data and alarm message transmission options via SMS, HTTP, FTP and e-mail, giving users flexible remote data access from their office.

  • Surface water, Groundwater
  • Vented pressure cell
  • Waterlevel/Pressure, Water temperature
  • Measures, stores, and transmits water level and temperature data
  • ± 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, all batteries are field-replaceable without additional tools
  • Long-term durability: a robust ceramic pressure cell, kevlar-reinforced cable, and high-quality 904 L stainless steel housing provide lasting quality
  • 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

Examples of Use

Continuous or real-time water level measurement of:

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

Ideal for monitoring:

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


OTT ecoLog 500 3G – CE Konformitätserklärung | Declaration of Conformity | Declaration de Conformité
OTT ecoLog 500 – CE Konformitätserklärung | Declaration of Conformity | Declaration de Conformité
White Paper – OTT ecoLog Guidance: Remote communication via mobile networks
Operating instructions Groundwater Datalogger OTT ecoLog 500 (3G)
OTT ecoLog 500 3G – Firmware – EN
Leaflet – Groundwater Datalogger OTT ecoLog 500
Brochure – OTT Ground water measurement
Technical Note – Sensor Selection Guide Groundwater
White Paper – OTT ecoLog Guidance: Remote communication via mobile networks
OTT ecoLog 500 – Firmware – EN
USB interface drivers – OTT IrDA-Link USB – EN
OTT Water Logger Operating Program


Technical Data

Water level measurement
Measuring ranges 0 … 4 m, 10 m, 20 m, 40 m, 100 m
Pressure resolution 0.01 % FS
Pressure accuracy ±0.05 % FS
Long-term stability ±0.1 % / year FS
Temperature measurement
Measuring range -25 °C … +70 °C
Temperature resolution 0.1 °C
Temperature accuracy ± 0.5 °C; higher accuracy optionally available
Electrical data
Power supply 2 x 1.5 V C Alkaline cells (only for version with GSM/GPRS-Modem)
Lithium cells, 3.6 V/13 Ah or
Lithium cells, 3.6 V/26 Ah
Battery life @ 1 h measurement interval & one transmission per week
Lithium-battery, DD approx. 10 years
Alkaline batteries, CC (only for version with GSM/GPRS-Modem) > 1 year
Modem GSM/GPRS 900/1800, 850/1900 MHz

GSM/GPRS; UMTS/HSPA+ 900/1800, 850/1900 MHz; 800/850, 900, AWS 1700, 1900, 2100 MHz

Antenna Built-in, weather-proof, external antenna optionally available
Interface at site Infrared (IrDA)
Memory 4 MB, approx. 500,000 measured values
Sampling/storage interval 5 seconds … 24 hours
Installation ≥ 2″
Environmental conditions
Operating temperature -30 °C … + 85 °C
Storage temperature -40 °C … + 85 °C
Dimensions L x Ø
Communication unit 520 mm x 50 mm
Probe 195 mm x 22 mm
System length 2 … 200 m ±1 % ±5 cm
(Cable length incl. communication unit and pressure probe)
Communication unit Aluminium, PA-GF
Sonde Stainless steel (DIN 1.4539, 904 L )
Communication unit (w/o. batteries) approx. 0.920 kg
Probe approx. 0.300 kg
Type of protection
Communication unit IP67
Probe IP68
EMC limits According to EG 204/108/EG,
ETSI EN 301 486-1/-7, EN 61326-1
EN 60950-1:2006 + A11:2009 + A1:2010

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Application Example