Van Essen Instruments Cera-Diver

Pressure transducer with integrated logger

Part # 51144-7

cera-diver

The ceramic Cera-Diver is designed specifically for monitoring groundwater in potentially corrosive conditions, such as brackish water and seawater.

The Cera-Diver is available in four ranges for monitoring the following depths:

  • 0 - 33 ft (0 - 10 m)
  • 0 - 66 ft (0 - 20 m)
  • 0 - 164 ft (0 - 50 m)
  • 0 - 328 ft (0 - 100 m)
Measuring 3.54 inches (90mm) in length and 0.86 inches (22mm) in diameter, this highly reliable and compact Diver registers groundwater levels with an accuracy of 0.05% (Full Scale). It is equipped with a memory capable of storing 48,000 measurements per parameter. This is sufficient enough to perform one measurement every ten minutes for an entire year.

In addition to internal data storage, the Cera-Driver can be connected to an external data logger, such as the DataLogIC 3000, or data telemetry systems with the Diver-DCX 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

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)