Cost-effective and reliable, these compact groundwater dataloggers provide accurate and reliable long-term measurements of water levels, temperature, and conductivity— essential data needed for effective water resource management, environmental remediation, mine dewatering, and slope stability.

Van Essen Diver logging sensors are submersible pressure transducers and data loggers for long-term uninterrupted, real-time water level monitoring when submerged at a fixed level under the water surface. The pressure sensor measures the equivalent hydrostatic pressure of the water above the sensor diaphragm to calculate the total water depth. The Diver autonomously measures pressure and temperature and records them in its internal memory. The Diver is ideal for ground and surface water level applications.

In addition to internal data storage, the Divers can be connected to an external data logger, such as the Stevens DataLogic 3000, or data telemetry systems like Avo with the Diver-SDI SDI-12 output adapter, allowing the Diver to be used for real-time data monitoring applications.

Manual data download in the field from a Diver’s internal storage can be done by utilizing the optional USB Interface Cable and connecting the diver directly to a desktop or laptop PC.

All Divers have a 3 year warranty, up to 10 years battery life, and can be used from 300 m below to 5000 m above sea level.

Technical Specifications

TemperatureMeasurement range: -20°C to 80°C
Operating Temperature: 0 °C to 50°C
Accuracy (max): ±0.2°C
Accuracy (typical): ±0.1°C
Response time (90% of final value):3 minutes (in water)
ProtocolSerial RS232
Memory Non-volatile memory. A measurement consists of date/time/pressure/temperature continuous and fixed length memory
Memory Capacity144,000 measurements
Battery lifeUp to 10 years, depending on use. The Diver is always in stand-by when not making a measurement. The power consumption of the integrated battery is dependent on the temperature and usage.
Clock accuracyBetter than ±1 minute per year at 25°C
Better than ±5 minutes per year within the operating temperature range
EnvironmentalIP68, 10 years continuously submerged in water at 100 m
MarterialsHousing: Stainless steel (316L)
Cap: Nylon PA6 30% glass fiber
Nose cone: ABS
Dimensions4.33" (110 mm) L x 0.87in (22 mm) Ø
Weight3.67 oz (104g)
Water column measurement range10 mH2O20 mH2O50 mH2O100 mH2O
Accuracy (max) ±2.0 cmH2O±4.0 cmH2O±10.0 cmH2O±20.0 cmH2O
Accuracy (typical) ±0.5 cmH2O±1.0 cmH2O±2.5 cmH2O±5.0 cmH2O
Long-term stability ±2 cmH2O±4 cmH2O±10 cmH2O±20 cmH2O
Resolution 0.2 cmH2O0.4 cmH2O1 cmH2O2 cmH2O
Display resolution 0.058 cmH2O0.092 cmH2O0.192 cmH2O0.358 cmH2O
Overload pressure 153075150


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