HOBO 100-Foot Depth Fresh Water Level Data Logger – U20-001-02

• Lightning protection – no long signal wires, and electronics are shielded in stainless steel housing for use in freshwater (see the Water Level logger sensor location drawing)
• HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure (see demo) temperature, and water density.
• Multiple-rate sampling (see demo) allows faster sampling at critical times such as when pumping starts or stops.
• Available in 4 depth ranges
• Ideal for use in wells, streams, lakes, wetlands and tidal areas
• No-vent-tube design for easy reliable deployment
• Available in stainless and titanium versions
• Durable ceramic pressure sensor
• 3-point NIST-traceable calibration certificate included

In what environment does this data logger operate?

This data logger operates in outdoor and underwater environments.

What measurements does this data logger support?

The U20-001-02 data logger supports the following measurements: Absolute Pressure, Barometric Pressure, Temperature and Water Level

Pressure and Water Level Measurements U20-001-02 and U20-001-02-Ti

• Operation Range：0 to 400 kPa (0 to 58 psia); approximately 0 to 30.6 m (0 to 100 ft) of water depth at sea level, or 0 to 33.6 m (0 to 111 ft) of water at 3,000 m (10,000 ft) of altitude
• Factory Calibrated Range：69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F)
• Burst Pressure：500 kPa (72.5 psia) or 40.8 m (134 ft) depth
• Water Level Accuracy*：
  。Typical error：±0.05% FS, 1.5 cm (0.05 ft) water
  。Maximum error：±0.1% FS, 3 cm (0.1 ft) water
• Raw Pressure Accuracy**：±0.3% FS, 1.20 kPa (0.17 psi) maximum error
• Resolution：<0.04 kPa (0.006 psi), 0.41 cm (0.013 ft) water
• Pressure Response Time (90%)***：<1 second; measurement accuracy also depends on temperature response time

• Operation Range：-20° to 50°C (-4° to 122°F)
• Accuracy：±0.44°C from 0° to 50°C (±0.79°F from 32° to 122°F), see Plot A in manual
• Resolution：0.10°C at 25°C (0.18°F at 77°F), see Plot A in manual
• Response Time (90%)：5 minutes in water (typical)
• Stability (Drift)：0.1°C (0.18°F) per year

• Real-time Clock：± 1 minute per month 0° to 50°C (32° to 122°F)
• Battery：2/3 AA, 3.6 Volt lithium, factory-replaceable
• Battery Life (Typical Use)：5 years with 1 minute or greater logging interval
• Memory (Non-volatile)：64K bytes memory (approx. 21,700 pressure and temperature samples)
• Weight：
  。Stainless steel models：approximately 210 g (7.4 oz)
  。Titanium models：approximately 140 g (4.8 oz)
• Dimensions：2.46 cm (0.97 inches) diameter, 15 cm (5.9 inches) length; mounting hole 6.3 mm (0.25 inches) diameter
• Wetted Materials：316 stainless steel, Viton® o-rings, acetyl cap, ceramic sensor
• Logging Interval：Fixed-rate or multiple logging intervals, with up to 8 user-defined logging intervals and durations; logging intervals from 1 second to 18 hours. Refer to the HOBOware software manual.
• Launch Modes：Immediate start and delayed start
• Offload Modes：Offload while logging; stop and offload
• Battery Indication：Battery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.
• Environmental Rating：IP68
• ：The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).

* Water Level Accuracy：With accurate reference water level measurement, known water density, accurate Barometric Compensation Assistant data, and a stable temperature environment.

** Raw Pressure Accuracy：Absolute pressure sensor accuracy includes all sensor drift, temperature, and hysteresis-induced errors.

*** Changes in Temperature：Allow 10 minutes in water to achieve full temperature compensation of the pressure sensor. Maximum error due to rapid thermal changes is approximately 0.5%.

• Datasheet｜get
• User's Manual｜get