The OTT CTD is an integrated sensor and datalogger for measurement of water level, temperature, and conductivity in groundwater and surface water applications.
It features a robust ceramic measuring cell for long term accuracy and has outputs for salinity and total dissolved solids (TDS). Its built in datalogger manages and stores all measurements at user-programmable intervals.
Surface water, Groundwater
Vented pressure cell and 4-electrode graphite conductivity cell
Waterlevel, Temperature, Conductivity
Measures and stores water level, temperature, and conductivity data
Water level: 0 … 4, 10, 20, 40, and 100 m Conductivity: 0.001…2.000 mS/cm, 0.10…100.00 mS/cm
±0,05 % FS
Yes
Advantages
Outputs for conductivity include specific conductivity, salinity, and total dissolved solids
Conductivity, depth, and temperature measurements are combined into a single device that easily installs in a 1” or larger well or conduit
4 MB of memory provides capacity for over 500,000 data points—ideal for long-term deployments OR short-term, high resolution pumping studies
Can be powered for over 18 months with off-the-shelf alkaline batteries or over 5 years with lithium batteries
Ability to perform contact gauge control measurements without sensor removal, so no need to pull the cable for routine maintenance
Complete in-well solution: all components are inserted into the groundwater well, eliminating the possibility of instrument vandalism
Battery life: up to 5 years with lithium batteries, with alkaline options are also available.
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
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
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 networks
Short-term or long-term projects
Salt water intrusion
Aquifer storage and recovery
Estuaries and wetlands
Technical Data
Lifetime (@ 1 h interval)
with Lithium-batteries
≥5 years
with Alkaline-batteries
≥1.5 years
Interface
Infrared (IrDA)
Datalogger
Memory
4 MB
Amount of values
approx. 500,000
Measurement interval
5 sec … 24 h
Storage interval
5 sec … 24 h
Installation
≥ 1″
Material
ABS, POM, stainless steel 1.4539 (904 L)
Weight
Com unit (incl. bat)
approx. 0.410 kg
Sonde
approx. 0.430 kg
Dimensions
Com unit L x Ø
400 mm x 22 mm
Sonde L x Ø
317 mm x 22 mm
Max system length
1.5 … 200 m ±1 % ±5 cm
Storage temperature
-40 … +85 °C
Protection class
Com unit
IP67 (water column max. 2 m, duration max. 24 h)
Sonde
IP68
Water level measurement
Measurement range:
0 … 4 m, 10 m, 20 m, 40 m, 100 m
Resolution:
0.001 m / 0.1 cm / 0.01 ft / 0.1 inch
/ 0.0001 bar / 0.001 psi
Accuracy:
± 0.05 % FS
Units:
m, cm, ft, inch, bar, psi
Temperature compensated operating range
-5 …. +45 °C (icefree)
Temperature measurement
Measurement range:
-25 … +70 °C
Resolution:
0.01 °C
Accuracy:
± 0.1 °C
Conductivity measurement
Measurement range selectable
Measurement range 1:
0.001 … 2.000 mS/cm
Resolution:
0.001 mS/cm
Accuracy:
±0.5 % of measurement value; (min ±0.001 mS/cm)
Units:
mS/cm / µS/cm
Measurement range 2:
0.1 … 100 mS/cm
Resolution:
0.01 mS/cm
Accuracy:
±1.5 % of measurement value; (min ±0.01 mS/cm)
Units:
mS/cm
Electrical data
Power supply
Lithium or Alkaline batteries
3 x 1.5 V battery (LR6·AA, FR6·AA)
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