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HOBO® U20L Water Level Logger (U20L-0x) Manual
HOBO Water Level Logger
Models:
• U20L-01 (30-foot depth)
• U20L-02 (100-foot depth)
• U20L-04 (13-foot depth)
Required Items:
• Coupler (COUPLER2-C) with
USB Optic Base Station (BASE-
U-4) or
HOBO Waterproof Shuttle
(U-DTW-1, firmware version
3.2.0 or later)*
• HOBOware
®
Pro, version 3.5
or higher
Accessories:
• Cable (CABLE-1-300 or
CABLE-1-50) and Cable Crimp
(CABLE-1-CRIMP)
• Replacement Coupler
(COUPLER2-C)
*If shuttle firmware version 3.2.0 or
later is needed, see the Onset
website or contact Onset Technical
Support.
17153-G
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.
Specifications
Pressure (Absolute) and Water Level Measurements U20L-01
Operation Range
Factory Calibrated Range
Burst Pressure
Water Level Accuracy*
Raw Pressure Accuracy**
Resolution
Pressure Response Time (90%)***
Pressure (Absolute) and Water Level Measurements U20L-02
Operation Range
Factory Calibrated Range
Burst Pressure
Water Level Accuracy*
Raw Pressure Accuracy**
Resolution
Pressure Response Time (90%)***
Pressure (Absolute) and Water Level Measurements U20L-04
Operation Range
Factory Calibrated Range
Burst Pressure
Water Level Accuracy*
Raw Pressure Accuracy**
Resolution
Pressure Response Time (90%)***
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
69 to 207 kPa (10 to 30 psia), 0° to 40°C (32° to 104°F)
310 kPa (45 psia) or 18 m (60 ft) depth
Typical error: ±0.1% FS, 1.0 cm (0.03 ft) water
Maximum error: ±0.2% FS, 2.0 cm (0.06 ft) water
±0.3% FS, 0.62 kPa (0.09 psi) maximum error
<0.02 kPa (0.003 psi), 0.21 cm (0.007 ft) water
<1 second at a stable temperature; measurement accuracy also
depends on temperature response time
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
69 to 400 kPa (10 to 58 psia), 0° to 40°C (32° to 104°F)
500 kPa (72.5 psia) or 40.8 m (134 ft) depth
Typical error: ±0.1% FS, 3.0 cm (0.1 ft) water
Maximum error: ±0.2% FS, 6.0 cm (0.2 ft) water
±0.3% FS, 1.20 kPa (0.17 psi) maximum error
<0.04 kPa (0.006 psi), 0.41 cm (0.013 ft) water
<1 second at a stable temperature; measurement accuracy also
depends on temperature response time
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
69 to 145 kPa (10 to 21 psia), 0° to 40°C (32° to 104°F)
310 kPa (45 psia) or 18 m (60 ft) depth
Typical error: ±0.1% FS, 0.4 cm (0.013 ft) water
Maximum error: ±0.2% FS, 0.8 cm (0.026 ft) water
±0.3% FS, 0.43 kPa (0.063 psi) maximum error
<0.014 kPa (0.002 psi), 0.14 cm (0.005 ft) water
<1 second at a stable temperature; measurement accuracy also
depends on temperature response time
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Table of Contents
Related Manuals for Hobo U20L-02
Summarization of Contents
Specifications
Pressure (Absolute) and Water Level Measurements U20L-01
Detailed specifications for the U20L-01 model, including operation range, accuracy, and resolution.
Pressure (Absolute) and Water Level Measurements U20L-02
Detailed specifications for the U20L-02 model, covering operation range, accuracy, and resolution.
Pressure (Absolute) and Water Level Measurements U20L-04
Detailed specifications for the U20L-04 model, including operation range, accuracy, and resolution.
Temperature Measurements (All Models)
Specifies temperature measurement parameters like range, accuracy, resolution, and response time for all models.
Logger Operation
Logger Operation Overview
Explains how to operate the logger, including software requirements and LED indicators.
Barometric Compensation
Barometric Compensation Overview
Details how to compensate for barometric pressure changes using a second logger or weather station.
Calibration
Logger Calibration Process
Describes the logger's individual calibration process for pressure sensors and accuracy limits.
Connecting the Logger to a Computer
Logger Connection Procedure
Outlines the steps and requirements for connecting the logger to a computer via a coupler and base station.
Launching the Logger
Logger Launch Steps
Provides step-by-step instructions for launching the logger using HOBOware software and setting parameters.
Deploying the Logger
Logger Deployment Guidelines
Offers guidelines for deploying the logger in various environments, emphasizing temperature stabilization and secure suspension.
Deploying a Water Level Logger for Barometric Pressure Data (Optional)
Optional Barometric Logger Deployment
Instructions for deploying a logger specifically for recording barometric pressure data.
Reading Out the Logger
Logger Data Retrieval
Explains the process of reading out logged data from the water level logger.
Processing Water Level Data using Barometric Pressure Data
Barometric Compensation Data Processing
Guides users on processing water depth data using barometric pressure data via HOBOware's assistant.
Barometric Data from Other Sources
Importing External Barometric Data
Details how to import barometric data from third-party weather stations or online sources.
Maintenance
Logger Maintenance Procedures
Covers essential maintenance like protecting the logger, inspecting for biofouling, and handling solvents.
Compensating for Drift
Understanding Pressure Sensor Drift
Explains pressure sensor drift over time and how reference measurements help compensate for it.
Verifying Accuracy
Logger Accuracy Verification
Describes methods to verify logger accuracy by comparing readings at different depths or with other devices.
Battery Guidelines
Logger Battery Information
Provides information on battery life, voltage, and replacement procedures for the logger's lithium battery.
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