Onset HOBO U20L-01 Water Level (30 ft) Data Logger

SKU
U20L-01
Manufacturer:
Onset
Onset

Key Features:

  • 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 30 feet
  • Durable ceramic pressure sensor withstands freezing
  • HOBOware Pro software provides easy conversion to accurate water level reading fully compensated for barometric pressure temperature and water density
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The HOBO U20L-001 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% measurement accuracy, a polypropylene housing for use in both fresh and salt water, and a non-vented design for convenient and hassle-free deployment.
Pressure (Absolute) and Water Level Measurements U20L-01
Operation Range0 to 207 kPa (0 to 30 psia); approximately 0 to 9 m (0 to 30 ft) of water depth at sea level, or 0 to 12 m (0 to 40 ft) of water at 3,000 m (10,000 ft) of altitude
Factory Calibrated Range69 to 207 kPa (10 to 30 psia), 0° to 40°C (32° to 104°F)
Burst Pressure310 kPa (45 psia) or 18 m (60 ft) depth
Water Level Accuracy*Typical error: ±0.1% FS, 1.0 cm (0.03 ft) water
Maximum error: ±0.2% FS, 2.0 cm (0.06 ft) water
Raw Pressure Accuracy**±0.3% FS, 0.62 kPa (0.09 psi) maximum error
Resolution<0.02 kPa (0.003 psi), 0.21 cm (0.007 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
Resolution0.10°C at 25°C (0.18°F at 77°F), see Plot A
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)
Battery2/3 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)
WeightApproximately 154 g (5.43 oz) in air Approximately 53.9 g (1.9 oz) in fresh water
Dimensions3.18 cm (1.25 inches) diameter, 15.24 cm (6.0 inches) length; mounting hole 6.3 mm (0.25 inches) diameter
Wetted MaterialsPolypropylene housing and lanyard; Viton and Buna-N O-rings; ceramic sensor in acetyl end cap; stainless steel screws suitable for saltwater
Logging IntervalFixed-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 ModesImmediate start and delayed start
Offload ModesOffload while logging; stop and offload
Battery IndicationBattery voltage can be viewed in status screen and optionally logged in datafile. Low battery indication in datafile.
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%.

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