Van Essen Diver Family

Pressure transducers with integrated data logger

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

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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Van Essen Diver Family

Pressure transducers with integrated data logger

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