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Microsoft word - 10366-d man-u22-001.doc
HOBO® U22 Water Temp Pro v2
(Part # U22-001)
The HOBO Water Temp Pro v2 logger is designed with a
durable, streamlined, UV-stable case for extended
deployments measuring temperature in fresh or salt water. The small size of the logger allows it to be easily mounted and/or hidden in the field. It is waterproof up to 120 m (400 feet) and rugged enough to withstand years of use, even in stream conditions. It has enough memory to record over 42,000 12-bit temperature measurements.
The logger uses an optical USB communications interface (USB-Optic Base Station, Part # BASE-U-4, with COUPLER2-C) for launching and reading out the logger.
The optical interface allows the logger to be offloaded
Thank you for purchasing a HOBO data logger. With
without compromising the integrity of the seals. The USB
proper care, it will give you years of accurate and reliable
compatibility allows for easy setup and fast downloads.
HOBOware® software is also required for logger operation. Visit www.onsetcomp.com for compatible software.
-40° to 70°C (-40° to 158°F) in air;
maximum sustained temperature of 50°C (122°F) in water
0.2°C over 0° to 50°C (0.36°F over 32° to 122°F),
0.02°C at 25°C (0.04°F at 77°F), see Plot A
5 minutes in water; 12 minutes in air moving 2 m/sec
± 1 minute per month 0° to 50°C (32° to 122°F)
2/3 AA, 3.6 Volt Lithium, factory-replaceable ONLY
6 years with 1 minute or greater logging interval
64K bytes memory (approx. 42,000 12-bit temperature
3.0 cm (1.19 in.) maximum diameter, 11.4 cm (4.5 in.) length; mounting hole 6.3 mm (0.25 inches) diameter
Polypropylene case, EPDM o-rings, stainless steel retaining ring
+13 g (0.5 oz.) in fresh water at 25°C (77°F); +17 g (0.6 oz.) with optional boot
1.5 m (5 ft.) drop at 0°C to 70°C (32°F to 150°F)
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 HOBOware software manual.
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 the relevant directives in the European Union (EU).
2009–2010 Onset Computer Corporation Part #: MAN-U22-001, Doc #: 10366-D
conserve power, the logger will go into a low-power (sleep)
Optional protective boot: Black (Part # BOOT-BLK) or
mode if there has been no communication with your
computer for 30 minutes. To wake up the logger, remove the logger from the coupler, wait a moment, then re-insert the logger.
Connecting the Logger
The HOBO Water Temp Pro v2 requires a coupler (Part #
The first time you launch the logger, the deployment
COUPLER2-C) and USB Optic Base Station (Part # BASE-
number will be greater than zero. Onset launches the loggers
U-4) or HOBO Waterproof Shuttle (Part # U-DTW-1) to
1. Install the logger software on your computer before
A light (LED) in the communications window of the logger
confirms logger operation. (In brightly lit areas, it may be necessary to shade the logger to see the LED blink.) The
2. Follow the instructions that came with your base station
following table explains when the light blinks during logger
or shuttle to attach the base station or shuttle to a USB
3. Make sure the logger’s communications window is clean
and dry. (Use a clean, nonabrasive cloth, if necessary.) If
the logger is wet, wipe off excess moisture.
seconds (the shorter the logging interval, the faster the light blinks);
4. Attach the coupler to the base station or shuttle, then
insert the logger into the coupler with the arrow on the
logger label aligned with the arrow on the coupler label.
launched in Start At Interval or Delayed Start
Sample and Event Logging
The logger can record two types of data: samples and events.
Samples are the sensor measurements recorded at each logging interval (for example, temperature every minute).
WATER TEMP PRO V2
Events are independent occurrences triggered by a logger activity, such as Bad Battery or Host Connected. Events help you determine what was happening while the logger was
The logger stores 64K of data, and can record over 42,000 12-bit temperature measurements.
5. If you are using the HOBO Waterproof Shuttle, briefly
press the coupler lever to put the shuttle into base station mode.
Deploying and Protecting the Logger
• Depending on water conditions and desired measurement
6. If the logger has never been connected to the computer
location, the logger should be appropriately weighted,
before, it may take a few seconds for the new hardware to
Some monitoring applications require precise placement of
7. Use the logger software to launch the logger. You can
the temperature sensor, such as measuring the temperature
check the logger’s status, read out the logger while it
of a flow at the bottom of a stream or river. Ensure that the
continues to log, stop it manually with the software, or let
logger is appropriately secured so that the temperature
it record data until the memory is full.
sensor is in the desired measurement location.
Refer to the software user’s guide for complete details on launching, reading out, and viewing data from the logger, including multiple logging intervals.
Important: USB communications may not function
properly at temperatures below 0°C (32°F) or above 50°C
The logger consumes significantly more power when it
is “awake” and connected to a base station or shuttle. To
: The plastic case will become brittle at
temperatures lower than -20°C. If the logger is deployed in
The battery in the HOBO Water Temp Pro v2 is a 3.6 Volt
a location where the temperature drops below -20°C, make
lithium battery. The battery life of the logger should be about
sure the logger remains stationary and is not pulled on or
six years. Actual battery life is a function of the number of
struck. Return the logger to above -20°C before handling.
deployments, logging interval, and operation/storage
• The opening at the sensor end of the logger accepts 1/4
temperature of the logger. To obtain a six-year battery life, a
inch (6.35mm) diameter nylon cord or other strong cable.
logging interval of one minute or greater should be used and
If wire is wrapped through the sensor end to secure the
the logger should be operated and stored at temperatures
logger, make sure the wire loop is snug to the sensor end.
between 0° and 25°C (32° and 77°F). Frequent deployments
Any slack in the loop may cause excessive wear.
with logging intervals of less than one minute, and continuous storage/operation at temperatures above 35°C,
• The logger is slightly positive buoyant so that it will float
will result in significantly lower battery life. For example,
if it is inadvertently dropped in the water or breaks free
continuous logging at a one-second logging interval will
from its mooring. You may want to mark or label the
result in a battery life of approximately one month.
logger with contact information in case the logger is lost.
The logger can report and log its own battery voltage. If the
• Onset recommends an optional boot (Part # BOOT-BLK or
battery falls below 3.1 V, the logger will record a “bad
BOOT-WHT) for protection against very cold
battery” event in the datafile. If the datafile contains “bad
temperatures (which can make the case brittle and prone to
battery” events, or if logged battery voltage repeatedly falls
fracture), or repeated pounding and abrasion caused by
below 3.3 V, the battery is failing and the logger should be
turbulent flow. The boot slides over the logger, has a
returned to Onset for battery replacement.
removable end cap, and is flexible enough to allow you to
To have your logger’s battery replaced, contact Onset or your
attach the coupler without removing the boot. To attach the
place of purchase for return arrangements. Do not open the
base station, remove the end cap and firmly insert the
case or attempt to replace the battery yourself. There are no
logger until the boot folds back. Make sure the arrow on
user-serviceable parts inside. If you open the case, the
the logger label is aligned with the arrow on the coupler
warranty will be voided, and the logger may no longer be
Although the boot does not cover the sensor end of the
logger, the temperature response time (to 90% of final value) in water increases slightly from 5 to 8 minutes due to the increased mass.
Do not cut open, incinerate, heat above
100°C (212°F), or recharge the lithium battery. The
• This logger should not be immersed for extended periods
battery may explode if the logger is exposed to extreme
in any liquid other than fresh or salt water. To do so may
heat or conditions that could damage or destroy the
void the warranty (refer to the Service and Support
battery case. Do not dispose of the logger or battery in
section). If you have any questions about chemical
fire. Do not expose the contents of the battery to water.
Dispose of the battery according to local regulations for
Prolonged exposure to chlorinated water is not
• To clean the logger, rinse it in warm water. Use a mild
dishwashing detergent if necessary. Do not use harsh chemicals, solvents, or abrasives, especially on the
Onset, HOBO, and HOBOware are registered trademarks of Onset Computer Corporation. Other products and brand names may be trademarks or registered trademarks of their respective owners.
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