Van Essen CTD-Diver Water Level & Conductivity Loggers

The Van Essen CTD-Diver is a datalogger designed to measure water pressure, electrical conductivity and temperature.


  • Compact size: 22mm diameter x 135mm length
  • Stores 144,000 records of time, pressure, temperature and conductivity
  • Innovative ceramic casing aids durability in brackish and salt water
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Van Essen CTD-Diver Water Level & Conductivity Loggers

The Van Essen CTD-Diver works wherever there is a need to monitor groundwater levels and saltwater intrusion, injected wastewater, or contamination from chemical discharges and landfill sites. The CTD-Diver is equipped with a four-electrode conductivity sensor that measures electrical conductivity from 0 to 120 mS/cm. There are two options for measuring conductivity: true or specific conductivity at 25 degrees C. Additionally, pressure and temperature are measured and recorded.

Questions & Answers
What software is needed for the CTD logger?
Diver-Office is a free software that can be downloaded on the Van Essen website. You can use the software to export data reports, visualize data and change logger settings.
How many measurements can the CTD Diver hold?
The memory capacity for the logger is 48,000 measurements.
Does the CTD diver need calibrated prior to use?
The logger is factory calibrated for temperature, pressure and conductivity prior to shipment. To calibrate conductivity in the field, a 2-point calibration (dry air/standard) can be performed to ensure accurate readings and a 4-point calibration will bring the logger up to specifications for the full-measurement range for conductivity.
Can this instrument be deployed as a CTD profiler? Does it provide real time data?
The Van Essen CTD-Divers are intended for monitoring conductivity, temperature and depth over a longer-term deployment. If you are interested in a meter that can measure these parameters in real time, with a topside display, the YSI ProSolo with conductivity/temperature probe and the option to add additional parameters later on. 
Are the DI27x CTD-Divers still available?
The DI271, DI271, DI273, and DI1274 CTD-Divers were discontinued in late 2021 and replaced with the newer DI28x models. Notable improvements include more memory, and a lower price point.
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Van Essen CTD-Diver Water Level & Conductivity Loggers
CTD-Diver water level, conductivity & temperature logger, 10m range
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Van Essen CTD-Diver Water Level & Conductivity Loggers
CTD-Diver water level, conductivity & temperature logger, 50m range
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Van Essen CTD-Diver Water Level & Conductivity Loggers
CTD-Diver water level, conductivity & temperature logger, 100m range
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Van Essen CTD-Diver Water Level & Conductivity Loggers
CTD-Diver water level, conductivity & temperature logger, 200m range
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