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HOBO Water Level (100 ft) Data Logger – U20L-02
HOBO Water Level (100 ft) Data Logger – U20L-02
HOBO Water Level (100 ft) Data Logger – U20L-02
HOBO Water Level (100 ft) Data Logger – U20L-02

HOBO Water Level (100 ft) Data Logger – U20L-02

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◤OVERVIEW

The HOBO U20L-02 is a low-cost, research-grade water level data logger for continuously measuring water level and temperature in a wide range of underwater environments. It features 0.1% accuracy, a polypropylene housing for use in both fresh and salt water, and a non-vented design for convenient and hassle-free deployment.

This data logger requires either the U-DTW-1 Waterproof Shuttle or the Base-U-4 Base Station for configuration and data offload, HOBOware software (free download).

NOTE: HOBOware Pro is required when using the U-DTW-1 Waterproof Shuttle. See compatible items below.

HOBO tidbit Loggersview

Helpful Links:

Barometric Pressure Compensation Assistant Demo

Multi-rate Sampling Demo

  • Self-contained non-vented design enables easy deployment
  • Ideal for use in both fresh and saltwater environments, including wells, streams, lakes, wetlands, and tidal areas
  • Depths up to 100 feet
  • Durable ceramic pressure sensor withstands freezing
  • HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure (see demo), temperature, and water density
  • Note:A calibration certificate is not offered for this logger. If you require a NIST-traceable calibration certificate, please see the U20-001-02 (freshwater) or U20-001-02-Ti (saltwater).


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 U20L-02 data logger supports the following measurements: Absolute Pressure, Barometric Pressure, Temperature and Water Level

Pressure (Absolute) and Water Level Measurements U20L-02

  • 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:±0.1% FS, 3.0 cm (0.1 ft) water
    。Maximum error:±0.2% FS, 6.0 cm (0.2 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 at a stable temperature; measurement accuracy also depends on temperature response time
Temperature Measurements
  • 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%):10 minutes in water (typical)
  • Stability (Drift):0.1°C (0.18°F) per year
Logger
  • 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:Approximately 154 g (5.43 oz) in air Approximately 53.9 g (1.9 oz) in fresh water
  • Dimensions:3.18 cm (1.25 inches) diameter, 15.24 cm (6.0 inches) length; mounting hole 6.3 mm (0.25 inches) diameter
  • Wetted Materials:Polypropylene housing and lanyard; Viton and Buna-N O-rings; ceramic sensor in acetyl end cap; stainless steel screws suitable for saltwater
  • 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 User’s Guide for details.
  • 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
  • CE: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 20 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