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 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.

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Technical Specifications

TD-Diver
Micro-Diver
Baro-Diver
Cera-Diver
CTD-Diver
Temperature Measurement range: -20°C to 80°C
Operating Temperature: 0 °C to 50°C
Accuracy (max): ±0.2°C
Accuracy (typical): ±0.1°C
Resolution:0.01°C
Response time (90% of final value):3 minutes (in water)
Protocol Serial RS232
Memory Non-volatile memory. A measurement consists of date/time/pressure/temperature continuous and fixed length memory
Memory Capacity 144,000 measurements
Battery life Up 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 accuracy Better than ±1 minute per year at 25°C
Better than ±5 minutes per year within the operating temperature range
Environmental IP68, 10 years continuously submerged in water at 100 m
Marterials Housing: Stainless steel (316L)
Cap: Nylon PA6 30% glass fiber
Nose cone: ABS
Dimensions 4.33" (110 mm) L x 0.87in (22 mm) Ø
Weight 3.67 oz (104g)
Model DI801 DI802 DI805 DI810
Water column measurement range 10 mH2O 20 mH2O 50 mH2O 100 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 cmH2O 0.4 cmH2O 1 cmH2O 2 cmH2O
Display resolution 0.058 cmH2O 0.092 cmH2O 0.192 cmH2O 0.358 cmH2O
Overload pressure 15 30 75 150
Power Internal Battery, 10-year life with "typical" use
  • 5 million measurements
  • 2,000 readout cycles
  • 2,000 programming cycles
Sample interval 0.5 seconds to 99 hours
Data output options
  • SDI-12 when connected to Diver-DCX converter box
  • Manual data download using USB interface cable connected to computer
  • Manual data download using "Diver Mate" or "Diver USB Reading Unit" accessories
Operating temperature, compensated 32 °F to 122 °F (0 °C to 50 °C)
Temperature accuracy ± 0.18 °F
Temperature resolution 0.018 °F
Wetted parts materials Housing: Stainless Steel (316L)
O-rings: Viton®
Pressure sensor: ceramic (AI2O3)
Cap / nose cone: Nylon PA6 30% glass fiber
Physical size 3.54 in (L) x Ø 0.71 in (90 mm x Ø18 mm) including suspension eye
Weight 2.46 oz (70 grams)
Depth Range Typical Accuracy Long-Term Stability Resolution
33 ft (10 m) ±0.05% FS ±0.2% FS 0.07 in (0.2 cm)
66 ft (20 m) ±0.05% FS ±0.2% FS 0.15 in (0.4 cm)
164 ft (50 m) ±0.05% FS ±0.2% FS 0.39 in (1 cm)
328 ft (100 m) ±0.05% FS ±0.2% FS 0.78 in (2 cm)
Depth range 4.92 ft (1.5 m)
Typical accuracy ± 0.19 in (0.5 cm)
Long-term stability ± 0.78 in (2 cm)
Resolution 0.04 in (0.1 cm)
Power Internal Battery, 10-year life with "typical" use
  • 5 million measurements
  • 2,000 readout cycles
  • 2,000 programming cycles
Sample interval 0.5 seconds to 99 hours
Data output options
  • SDI-12 when connected to Diver-DCX converter box
  • Manual data download using USB interface cable connected to computer
  • Manual data download using "Diver Mate" or "Diver USB Reading Unit" accessories
Operating temperature, compensated 32 °F to 122 °F (0 °C to 50 °C)
Temperature accuracy ± 0.18 °F
Temperature resolution 0.018 °F
Wetted parts materials Housing: Stainless Steel (316L)
O-rings: Viton®
Pressure sensor: ceramic (AI2O3)
Cap / nose cone: Nylon PA6 30% glass fiber
Physical size 3.54 in (L) x Ø 0.86 in (90 mm x Ø22 mm) including suspension eye
Weight 1.92 oz (54.4 grams)
Power Internal Battery, 10-year life with "typical" use
  • 5 million measurements
  • 2,000 readout cycles
  • 2,000 programming cycles
Sample interval 0.5 seconds to 99 hours
Data output options
  • SDI-12 when connected to Diver-DCX converter box
  • Manual data download using USB interface cable connected to computer
  • Manual data download using "Diver Mate" or "Diver USB Reading Unit" accessories
Conductivity Measurement Range: 10 µS/cm to 120 mS/cm
Accuracy: ± 1.0% of reading
Resolution: ± 0.1% of reading
Operating temperature, compensated 32 °F to 122 °F (0 °C to 50 °C)
Temperature accuracy ± 0.18 °F
Temperature resolution 0.018 °F
Wetted parts materials Housing: ceramic (ZrO2)
O-rings: Viton®
Pressure sensor: ceramic (AI2O3)
Cap / nose cone: Nylon PA6 30% glass fiber
Physical size 3.54 in (L) x Ø 0.86 in (90 mm x Ø22 mm) including suspension eye
Weight 1.94 oz (55 grams)
Depth Range Typical Accuracy Long-Term Stability Resolution
33 ft (10 m) ±0.05% FS ±0.1% FS 0.07 in (0.2 cm)
66 ft (20 m) ±0.05% FS ±0.1% FS 0.15 in (0.4 cm)
164 ft (50 m) ±0.05% FS ±0.1% FS 0.39 in (1 cm)
328 ft (100 m) ±0.05% FS ±0.1% FS 0.78 in (2 cm)
Power Internal Battery, 10-year life with "typical" use
  • 5 million measurements
  • 2,000 readout cycles
  • 2,000 programming cycles
Sample interval 1 second to 99 hours
Data output options
  • SDI-12 when connected to Diver-DCX converter box
  • Manual data download using USB interface cable connected to computer
  • Manual data download using "Diver Mate" or "Diver USB Reading Unit" accessories
Conductivity Measurement Range: 10 µS/cm to 120 mS/cm
Accuracy: ± 1.0% of reading
Resolution: ± 0.1% of reading
Operating temperature, compensated 32 °F to 122 °F (0 °C to 50 °C)
Temperature accuracy ± 0.18 °F
Temperature resolution 0.018 °F
Wetted parts materials Housing: ceramic (ZrO2)
Conductivity sensor: platinum electrodes on ceramic (AI2 O3) carrier
O-rings: Viton®
Pressure sensor: ceramic (AI2O3)
Cap / nose cone: Nylon PA6 30% glass fiber
Physical size 5.31 in x Ø0.86 in (135 mm x Ø22 mm) including suspension eye
Weight 3.5 oz (100 grams)
Depth Range Typical Accuracy Long-Term Stability Resolution
33 ft (10 m) ±0.05% FS ±0.2% FS 0.07 in (0.2 cm)
164 ft (50 m) ±0.05% FS ±0.2% FS 0.39 in (1 cm)
328 ft (100 m) ±0.05% FS ±0.2% FS 0.78 in (2 cm)

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