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HOBO U20L - Low Cost Water Level Data Logger

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

Manufacturer:

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Specifications
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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="" 21="" cm="" 007="" ft="" water="" span="">
Pressure Response Time (90%)***	<1 second="" at="" a="" stable="" temperature="" measurement="" accuracy="" also="" depends="" on="" response="" time="" span="">

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="" 41="" cm="" 013="" ft="" water="" td="">
Pressure Response Time (90%)***	<1 second="" at="" a="" stable="" temperature="" measurement="" accuracy="" also="" depends="" on="" response="" time="" td="">

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="" 14="" cm="" 005="" ft="" water="" td="">
Pressure Response Time (90%)***	<1 second="" at="" a="" stable="" temperature="" measurement="" accuracy="" also="" depends="" on="" response="" time="" td="">

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.
	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

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.

HOBOware Standard features

Simple menus for fast, easy logger setup and readout
Point & click for fast setup and readout
Scaling to real-world engineering units
Presentation-quality graphs
Easy export of data files to text or Excel format

FREE DOWNLOAD

Learn more about HOBOware and HOBOware-Pro Features >>

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