HOBO® U20L Water Level Logger (U20L-0x) Manual
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
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
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
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
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.
