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HOBO Water Level - U20L - Low-Cost Water Level Monitoring

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.
Part Number: U20L-04, U20L-01, U20L-02
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$564.00 ex GST
[$620.40 inc GST]

HOBO U20L Water Level Loggers

The HOBO U20L Series is a low-cost, research-grade 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.

  • 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 
  • 3 Models for Depths of 4m, 9m and 30 Meters
  • 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

The U20L Data Loggers are for use in Outdoor and Underwater environments

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)

Measurements:
The U20L series Data Logger supports the following measurements:

Temperature, Barometric Pressure, Water Level
 
IMPORTANT: This HOBO data logger requires HOBOware software and a communications device. See compatible items below.
 

HOBO U20L Water Level Loggers

The HOBO U20L Series is a low-cost, research-grade 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.

  • 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 
  • 3 Models for Depths of 4m, 9m and 30 Meters
  • 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

The U20L Data Loggers are for use in Outdoor and Underwater environments

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)

Measurements:
The U20L series Data Logger supports the following measurements:

Temperature, Barometric Pressure, Water Level
 
IMPORTANT: This HOBO data logger requires HOBOware software and a communications device. See compatible items below.
 

HOBO U20L Water Level Data Logger

View an introduction to the new HOBO U20L low-cost, research-grade water level loggers setting a new standard for price/performance for high-accuracy water level and temperature monitoring.



Tips for Deploying the New HOBO U20L Water Level Data Logger

Webinar: Time-saver tips for deploying the new HOBO U20L Water Level data logger to ensure good quality data.

 

Pressure (Absolute) and Water Level Measurements U20L-01 (0-9 Meter)
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)
Burst 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) 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
Pressure (Absolute) and Water Level Measurements U20L-02 (0-30.6 Meter)
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
Pressure (Absolute) and Water Level Measurements U20L-04 (0-4 Meter)
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) water
Raw 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

Common Specifications:

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
Resolution 0.10°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)
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.
CE Compliant The CE Marking identifies this product as complying with all relevant directives in the European Union (EU).


** Raw Pressure Accuracy: Absolute pressure sensor accuracy includes all sensor drift, temperature, and hysteresis-induced errors.* Water Level Accuracy: With accurate reference water level measurement, known water density, accurate Barometric Compensation Assistant data, and a stable temperature environment.

*** 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%.

HOBOware Software

IMPORTANT: This HOBO data logger requires HOBOware software and a communications cable (see related products below)
HOBOware Software is a FREE download


or Learn more about HOBOware and HOBOware-Pro features

 

Note: This logger also operates with the advanced HOBOware-Pro Software

 


 

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