OTT - Model ecoLog 800 -Water Level Logger

• Application: Surface water, Groundwater
• Measurement technology: Vented pressure cell and 4-electrode graphite conductivity cell
• Parameters measured: Waterlevel/Pressure, Water temperature, Conductivity
• 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, 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 

Continuous or real-time water level, temperature, and conductivity measurement of:

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

Ideal for monitoring:

• Continuous water level / water quality networks
• Short-term or long-term projects
• Salt water intrusion
• Aquifer storage and recovery

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 (only for version with GSM/GPRS-Modem)
• Lithium type: 1 x 3.6 V/13 Ah or
• 1 x 3.6 V/26 Ah

Battery life (hourly measurement, one transmission/day)

• Lithium battery (26 Ah): >10 years
• Alkaline batteries (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; 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

Weight:

• 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. to EC 204/108/EC, ETSI EN 301 486-1/-7, EN 61326-1
• EN 60950-1:2006 + A11:2009 + A1:2010