HOBO U20 Water Level Data Logger - U20-001-01

30-Foot Depth - freshwater

Qty.	1-9	10-99	100+
$US	$495	$458	$421

Printable Data Sheet

Overview
Required Items
Parts & Accessories

Overview

Description & Features

Detailed Specifications

Documentation

FAQs

Resources

Featured Resources

	Sensor location drawing
	Barometric Pressure Compensation Assistant Demo
	Multi-rate Sampling Demo

The HOBO Water Level data logger features high accuracy at a great price and ease-of-use, with no cumbersome vent tubes or desiccants to maintain. This data logger is ideal for recording water levels and temperatures in shallow wells, streams, lakes and freshwater wetlands. The HOBO Water Level Titanium is recommended for saltwater deployment for recording water levels and temperatures in brackish wetlands and tidal areas.

View how the HOBO Water Level Logger compares to the Competition.

Features:

Lightning protection - no long signal wires, and electronics are shielded in stainless steel housing for use in freshwater (see the Water Level logger sensor location drawing)
HOBOware Pro software provides easy conversion to accurate water level reading, fully compensated for barometric pressure (see demo) temperature, and water density.
Multiple-rate sampling (see demo) allows faster sampling at critical times such as when pumping starts or stops.
Available in 4 depth ranges
Ideal for use in wells, streams, lakes, wetlands and tidal areas
No-vent-tube design for easy reliable deployment
Available in stainless and titanium versions
Durable ceramic pressure sensor

Environment:

The U20-001-01 Data Logger is for use in Outdoor and Underwater environments

Measurements:

The U20-001-01 Data Logger supports the following measurements : Temperature, Barometric Pressure, Water Level

Pressure and Water Level Measurements U20-001-01 andU20-001-01-Ti
	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: ±0.05% FS, 0.5 cm (0.015 ft) water Maximum error: ±0.1% FS, 1.0 cm (0.03 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
	Thermal Response Time (90%)***	Approximately 10 minutes in water to achieve full temperature compensation of the pressure sensor

Temperature Measurements (All Models)
	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%)	3.5 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	Stainless steel models: approximately 210 g (7.4 oz) Titanium models: approximately 140 g (4.8 oz)
	Dimensions	2.46 cm (0.97 inches) diameter, 15 cm (5.9 inches) length; mounting hole 6.3 mm (0.25 inches) diameter
	Wetted Materials	Stainless Steel models: 316 stainless steel, Viton® o-rings, acetyl cap, ceramic sensor Titanium models: Titanium, Viton o-rings, acetyl cap, ceramic sensor
	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 software manual.
	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).

* Water Level Accuracy: With accurate reference water level measurement and Barometric Compensation Assistant data
** Raw Pressure Accuracy: Absolute pressure sensor accuracy includes all pressure drift, temperature, and hysteresis-induced errors
*** Thermal Response Time: Maximum error due to rapid thermal changes is approximately 0.5%

KIT-D-U20-01
KIT-D-U20-02
KIT-D-U20-04
KIT-S-U20-01
KIT-S-U20-02
KIT-S-U20-04
U20-001-01
U20-001-01-Ti
U20-001-02
U20-001-02-Ti
U20-001-03
U20-001-03-Ti
U20-001-04
U20-001-04-Ti

U20 Water Level Logger User's Guide

PDF
KIT-D-U20-01
KIT-D-U20-02
KIT-D-U20-04
KIT-S-U20-01
KIT-S-U20-02
KIT-S-U20-04
U20-001-01
U20-001-01-Ti
U20-001-02
U20-001-02-Ti
U20-001-03
U20-001-03-Ti
U20-001-04
U20-001-04-Ti

Sample U20 Calibration Certificate - NIST-SETUP

PDF

Can the data be retrieved from a logger that is not communicating, or a logger that was accidentally re-launched prior to the data being downloaded?

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There are two common reasons for data loss: Relaunching a logger before the data has been saved Technical problem with the logger itself.

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The graph shows a random spike in the recorded data. What may have caused this?

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Spikes in the data file may be caused by rapid pressure changes or thermal shock (quick temperature changes). .

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I cannot communicate with my data logger.

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The Optic and Tidbit data loggers must be inserted into the Base Station in order for the computer to detect them; it will not detect the Base...

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My battery level seems to be going down quickly, what could be causing this?

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Check both the logging and the sampling interval to make sure they are greater than one-minute intervals.

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The datafile shows two more points than my testing did. Why?

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The first and last event on your datafile is a stamp of the start and end time.

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Can the data loggers be exposed to any type of chemical or chemical vapors?

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As a general rule, no.

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How often do the data loggers need recalibration and/or servicing?

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The CO data logger should be checked, at a minimum, on a yearly basis. Proper testing requires a CO testing chamber.

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Why is my connection to the data loggers intermittent?

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For best performance, connect the USB cable directly to a port on your computer.

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What happens if my Keyspan USB server has a power interruption?

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If your Keyspan USB server has its power interrupted while you are running an alarm configuration, HOBOware will lose its connection to the data...

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How do I turn the data logger off?

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HOBO/StowAway data loggers shut off when the memory is full (unless wrap around is selected), or the data is downloaded to a computer.

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My data logger only recorded one data point, stops recording immediately after launch, or stopped recording prematurely.

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There are many situations that can cause a data logger to stop recording: 1.

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I cannot communicate with my HOBO Shuttle!

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Check to make sure that the batteries are still good. Follow the directions below for the model you have.

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How do I turn the data logger off?

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All HOBO and StowAway data loggers shut off when the memory is full (unless wrap around is selected), or the data is downloaded to a computer.

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What data loggers are supported by Real-Time Alarm Software?

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All U10 and U12 data loggers are fully compatible with the Real-Time Alarm Software.

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The batteries in my data logger died while in use. Did I lose all of my data?

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No. The data is stored on non-volatile EEPROM. For data loggers with external batteries: change batteries and offload data, then relaunch normally.

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Do I need to rename the data file on the logging PC?

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You do not need to periodically rename or delete the data file on the logging PC because the file is automatically updated (e.g., test_1.txt, .

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How does HOBOware behave when a data logger has a low battery?

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When device battery power is very low interaction with HOBOware can be intermittent. .

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The data logger is shutting off prematurely.

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A discharge of static electricity may cause a running data logger to stop recording.

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What does the CE stamp on the data logger mean?

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The CE mark identifies the product as complying with relevant directives in the European Union (EU). .

View Full FAQ
What data loggers are supported by Real-Time Alarm Software?

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All U10 and U12 data loggers are fully compatible with the Real-Time Alarm Software.

View Full FAQ
Latest Conditions do not appear to be updating, but my graphs look correct?

[show/hide]

An issue has been discovered with the database access layer, causing invalid latest conditions to be shown for U30 analog port sensors.

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What is a Data Logger?

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A data logger (or datalogger), commonly referred to as a 'HOBO', is an electronic instrument that records measurements (temperature, relative...

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After download data from my shuttle, i see a "header error" while opening a file.

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There are rare circumstances when using Onset optically-coupled loggers (those that operate with the BASE-U-4 Optic Base Station and U-DTW-1...

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My U24, U22 or u20 logger is showing a bad battery is the status menu?

[show/hide]

Basically we found that the alignment of the logger in the coupler can cause this issue.

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How do I protect my data loggers from electrical discharge (ESD)?

[show/hide]

A discharge of static electricity may cause a running data logger to stop recording.

View Full FAQ

The following are associated resources for this product. In general users of this product can gain insight into its possible use by utilizing the resources below.

White Papers:

Underwater Temperature Loggers: Considerations For Selection & Deployment [.pdf file]

Podcasts:

Application Stories:

Water Level Loggers Track Hurricane Surge In The Nick Of Time [Page]

Application Solutions:

Remote Water Level Monitoring [Page]

Live Systems:

Required Items

Communications

Data Offload - Base Stations - Shuttles

BASE-U-4

Optic USB Base Station

1-9	10-99	100+
$115	$106	$98

U-DTW-1

HOBO® Waterproof Shuttle

1-9	10-99	100+
$230	$213	$195

Software

Graphing and Analysis

BHW-PRO-CD

HOBOware Pro Mac/Win

compare Lite to Pro

1-9	10-99	100+
$99	$92	$84

Parts & Accessories

Accessories

Carrying Cases

U20-CASE-1

Water Level Logger Carrying Case

1-9	10-99	100+
$30	$28	$25

Data Offload Couplers

COUPLER2-B

Replacement Coupler for U20 Water Level Loggers

1-9	10-99	100+
$11	$10	$9

Protective Housings

HOUSING-U2X

U2X Protective Housing

1-9	10-99	100+
$38	$36	$34

Stainless Steel Cable/Crimps

CABLE-1-300

1/16" Stainless Steel Cable 300ft

1-9	10-99	100+
$260	$240	$221

CABLE-1-50

1/16" Stainless Steel Cable 50ft

1-9	10-99	100+
$59	$55	$50

CABLE-1-CRIMP

Crimp Sleeve 12 Pack

1-9	10-99	100+
$29	$27	$25

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Technical Notes
	Technical Application Notes for the HOBO Water Level Loggers Barometric Compensation Assistant
Application Story
	Water Level Loggers Track Hurricane Surge Levels
Application Solution
	Monitoring changing water levels
Compare
	View how the HOBO Water Level Logger compares to the competition
Webinar
	Critical Success Factors in Water Level Monitoring
Podcasts
	Demystifying Level Logger Accuracy Specifications Advantages of the HOBO Water Level Logger

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HOBO U20 Water Level Data Logger - U20-001-01

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