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Onset HOBO Water Level Data Loggers. Available in 0 to 13ft, 0 to 30ft, 0 to 100ft and 0 to 250ft Ranges and in Titanium and Stainless Steel Housing



HOBO Water Level Data Logger

Onset Data Logger for Measuring and Recording Water Levels and Temperature in Rivers, Streams and Wells

Part Number: U20-001-01

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  • Measure and Log Water Level (Pressure) and Temperature Readings

  • -20°C to 50°C Temperature Measurement Range with ±0.44°C Accuracy

  • Factory-Replaceable 2/3 AA 3.6 Volt Lithium Battery with 5 Year Life @ 1 Minute Sampling Rate

  • No-Vent-Tube Design for Easy Reliable Deployment and Durable Ceramic Pressure Sensor

  • Available in 0 to 13 ft, 0 to 30ft, 0 to 100ft and 0 to 250ft Water Depth Ranges and Stainless Steel or Titanium Housing


Requires HOBOware Pro Software (Version 3.2+) and an Optic USB Base Station (BASE-U-4) or Shuttle Data Transporter (U-DTW-1)

Please allow 3-5 days for this item to ship.

$495.00

All Calibration Orders Have a 5 to 7 Business Day Lead Time
1 Year Calibration Due Date Unless Otherwise Specified

$495.00

Onset HOBO® U20 Water Level Data Logger Specifications

Data Channels 2 Channels (Water Level and Temperature)
Water Level (Pressure)
up to 13 ft Depth
Range: 0 to 4 m (0 to 13 ft); 0 to 145 kPa (0 to 21 psia)
Factory Calibrated Range**: 69 to 145 kPa (10 to 21 psia)
Water Level Accuracy***: 0.3cm (0.01 ft) water; ±0.075% FS
Raw Pressure Accuracy: ±0.3% FS, 0.62 kPa (0.09 psi) Max
Resolution: 0.14 cm (0.005 ft), < 0.14 kPA (0.002 psi)
Burst Pressure: 310 kPa (45 psia) or 18m (60 ft) depth
Response Time (Pressure): < 1 Second to 90%
Response Time (Thermal): About 10 Minutes in Water to Achieve Full Temperature Compensation of the Pressure Sensor
* Nominal Values at Sea Level
** @ 0°C to 40°C Temperature Range
*** Typical Maximum Error Over the Full Temperature and Pressure Calibrated Range
Water Level (Pressure)
up to 30 ft Depth
Range*: 0 to 9 m (0 to 30 ft); 0 to 207 kPa (0 to 30 psia)
Factory Calibrated Range**: 69 to 207 kPa (10 to 30 psia)
Water Level Accuracy***: 0.5cm (0.015 ft) water; ±0.05% FS
Raw Pressure Accuracy: ±0.3% FS, 0.62 kPa (0.09 psi) Max
Resolution: 0.21 cm (0.007 ft), < 0.02 kPA (0.003 psi)
Burst Pressure: 310 kPa (45 psia) or 18m (60 ft) depth
Response Time (Pressure): < 1 Second to 90%
Response Time (Thermal): About 10 Minutes in Water to Achieve Full Temperature Compensation of the Pressure Sensor
* Nominal Values at Sea Level
** @ 0°C to 40°C Temperature Range
*** Typical Maximum Error Over the Full Temperature and Pressure Calibrated Range
Water Level (Pressure)
up to 100ft Depth
Range*: 0 to 30 m (0 to 100 ft); 0 to 400 kPa (0 to 58 psia)
Factory Calibrated Range**: 69 to 400 kPa (10 to 58 psia)
Water Level Accuracy***: 1.5cm (0.05 ft) water; ±0.05% FS
Raw Pressure Accuracy: ±0.3% FS, 0.62 kPa (0.09 psi) Max
Resolution: 0.41 cm (0.013 ft), < 0.04 kPA (0.006 psi)
Burst Pressure: 500 kPa (72.5 psia) or 40.8m (134 ft) depth
Response Time (Pressure): < 1 Second to 90%
Response Time (Thermal): About 10 Minutes in Water to Achieve Full Temperature Compensation of the Pressure Sensor
* Nominal Values at Sea Level
** @ 0°C to 40°C Temperature Range
*** Typical Maximum Error Over the Full Temperature and Pressure Calibrated Range
Water Level (Pressure)
up to 250ft Depth
Range*: 0 to 76 m (0 to 250 ft); 0 to 850 kPa (0 to 123 psia)
Factory Calibrated Range**: 69 to 850 kPa (10 to 123.3 psia)
Water Level Accuracy***: 3.8cm (0.125 ft) water; ±0.05% FS
Raw Pressure Accuracy: ±0.3% FS, 0.62 kPa (0.09 psi) Max
Resolution: 0.87 cm (0.028 ft), < 0.085 kPA (0.012 psi)
Burst Pressure: 1200 kPa (174 psia) or 112m (368 ft) depth
Response Time (Pressure): < 1 Second to 90%
Response Time (Thermal): About 10 Minutes in Water to Achieve Full Temperature Compensation of the Pressure Sensor
* Nominal Values at Sea Level
** @ 0°C to 40°C Temperature Range
*** Typical Maximum Error Over the Full Temperature and Pressure Calibrated Range
Water Level (Pressure) Range: 0 to 4 m (0 to 13 ft); 0 to 145 kPa (0 to 21 psia)
Factory Calibrated Range**: 69 to 145 kPa (10 to 21 psia)
Water Level Accuracy***: 0.3cm (0.01 ft) water; ±0.075% FS
Raw Pressure Accuracy: ±0.3% FS, 0.62 kPa (0.09 psi) Max
Resolution: 0.14 cm (0.005 ft), < 0.14 kPA (0.002 psi)
Burst Pressure: 310 kPa (45 psia) or 18m (60 ft) depth
Response Time (Pressure): < 1 Second to 90%
Response Time (Thermal): About 10 Minutes in Water to Achieve Full Temperature Compensation of the Pressure Sensor
* Nominal Values at Sea Level
** @ 0°C to 40°C Temperature Range
*** Typical Maximum Error Over the Full Temperature and Pressure Calibrated Range
Temperature Range: -20°C to 50°C (-4°F to 122°F)
Accuracy: ±0.37°C @ 20°C; ±0.5°C @ -5°C to 50°C
Resolution: 0.1°C @ 20°C; 0.2°C @ -5°C to 50°C
Response Time: 3.5 Minutes in Water to 90%
Stability (Drift): ≤0.1°C/year (≤0.18°F/year)
Data Storage Capacity Approximately 21,700 Pressure and Temperature Total Readings
ampling Rate 1 Second to 18 Hours (User-Specified)
Up to 8 Sampling Intervals User-Defined
Battery 2/3 AA 3.6 Volt Lithium Battery - Factory Replaceable
Battery Life 5 Years @ 1 Minute Sampling Rate
(Dependant Upon Environment and Operating Range)
Battery Status Indication Battery status displayed at launch or with status screen; Battery voltage can be logged
Environment Waterproof; suitable for deployment in water or air, case materials resistant to fuels, solvents and lubricants. Titanium version recommended for saltwater deployments.
Operating Range Temperature: -20°C to 50°C (4°F to 122°F)
Sample & Event Logging Samples: Recorded Sensor Measurements
Events: Logger Activity (ie: Bad Battery, Host Connected)
Wetted Materials Vitron® O-Rings, Acetyle Cap and Ceramic Sensor
316 Stainless Steel or Titanium Housing
Software Compatibility HOBOware PRO Version 3.2+
OS Compatibility Windows: Windows 10, 8.1, 8 and 7
Mac: OS X 10.9.x, 10.10.x and 10.11.x
Operation Indicator Red LED in Communications Window
Start Modes Immediate Start, Programmable Start Time/Date
Offload Modes Offload while logging or stop and offload
Real-Time Clock ±1 minute per month 0°C to 50°C (32°F to 122°F)
Standards Compliance CE
Weight 210 g (7.4 oz)
Dimensions Logger: 24.6mm D x 150mm L (0.97" D x 5.9" L)
Mounting Hole: 6.3mm (0.25") Diameter

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