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OVERVIEW
Low-Cost, Research-Grade
The HOBO U20L Series Water Level loggers are a low-cost, research-grade data logger for continuous monitoring of water level and temperature at depths of up to 13, 30, or 100 feet in a wide range of underwater environments. This logger features 0.1% measurement accuracy, a polypropylene housing for use in both freshwater and saltwater, and a non-vented design for convenient and hassle-free deployment.
The HOBO U20L Water Level Logger is used for monitoring changing water levels in a wide range of applications, including streams, lakes, wetlands, tidal areas, and groundwater. Using HOBOware® Pro, you can easily configure this logger to record absolute pressure and temperature data. This logger features a ceramic pressure sensor, durable housing, and a protective end cap for deployment in existing wells or stilling wells. Without cumbersome vent tubes or desiccants to maintain, this easy-to-use logger is an ideal solution for water level studies and research.
Note: A calibration certificate is not offered for this logger. If you require a NIST-traceable calibration certificate, please see the U20 Range (not the U20L series)
Features
- Ideal for use in both fresh and saltwater environments, including wells, streams, lakes, wetlands, and tidal areas
- Self-contained, non-vented design
- Durable ceramic pressure sensor withstands freezing
- 3 Models for Depths of 4m, 9m and 30 Meters
- HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure, temperature, and water density
Important Information
Requires HOBOware Pro software and either a U-DTW-1 Waterproof Shuttle or the Base-U-4 Optic USB Base Station for configuration and data offload. Please see compatible items below.
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SOFTWARE
HOBOware Software
HOBOware software is used for launching, reading out, and plotting data from HOBO® data loggers. With HOBOware, you can also check logger status, filter and export data, save changes to graphs in project files, and scale data with the Linear Scaling and Pulse Scaling data assistants. There are two versions of HOBOware: HOBOware and HOBOware Pro.
Learn more about HOBOware and HOBOware-Pro Features >>
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SPECIFICATIONS
Pressure (Absolute) and Water Level Measurements U20L-01
Operation Range 0 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 Range 69 to 207 kPa (10 to 30 psia), 0° to 40°C (32° to 104°F) Bust Pressure 310 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) waterRaw 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
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) waterRaw 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
Pressure (Absolute) and Water Level Measurements U20L-04
Operation Range 0 to 145 kPa (0 to 21 psia); approximately 0 to 4 m (0 to 13 ft) of water depth at sea level, or 0 to 7 m (0 to 23 ft) of water at 3,000 m (10,000 ft) of altitude Factory Calibrated Range 69 to 145 kPa (10 to 21 psia), 0° to 40°C (32° to 104°F) Burst Pressure 310 kPa (45 psia) or 18 m (60 ft) depth Water Level Accuracy* Typical error: ±0.1% FS, 0.4 cm (0.013 ft) water
Maximum error: ±0.2% FS, 0.8 cm (0.026 ft) waterRaw Pressure Accuracy** ±0.3% FS, 0.43 kPa (0.063 psi) maximum error Resolution <0.014 kPa (0.002 psi), 0.14 cm (0.005 ft) water
Pressure Response Time (90%)*** <1 second at a stable temperature; measurement accuracy also depends on temperature response time
Temperature Measurements (All Models)
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 of User Manual Resolution 0.10°C at 25°C (0.18°F at 77°F), see Plot A of User 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 waterDimensions 3.18 cm (1.25 inches) diameter, 15.24 cm (6.0 inches) length;
mounting hole 6.3 mm (0.25 inches) diameterWetted Materials Polypropylene housing and lanyard; Viton and Buna-N O-rings; ceramic sensor in acetal end cap; stainless steel screws suitable for saltwater Logging Interval Fixed-rate or multiple logging intervals, with up to 8 userdefined 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%.
HOBO U20L – Low Cost Water Level Data Logger
$871.00 ex GST
The HOBO U20L Series is the industry’s lowest-cost family of loggers for monitoring water level and temperature in both fresh and saltwater, in depths up to 30 Meters.
