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ecoLog 500

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


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


GSM/GPRS 900/1800, 850/1900 MHz

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


Built-in, weather-proof, external antenna optionally available

Interface at site

Infrared (IrDA)


4 MB, approx. 500,000 measured values

Sampling/storage interval

5 seconds ... 24 hours


≥ 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


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


Stainless steel (DIN 1.4539, 904 L )



Communication unit (w/o. batteries)

approx. 0.920 kg


approx. 0.300 kg

Type of protection


Communication unit




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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