HOBO Water Temp Pro v2 Manual
1-800-LOGGERS (564-4377) • 508-759-9500
© 2009–2012 Onset Computer Corporation. All rights reserved.
Onset, HOBO, and HOBOware are trademarks or registered
trademarks of Onset Computer Corporation. All other trademarks are
the property of their respective companies.
Patent #: 6,826,664 10366-E MAN-U22-001
Some monitoring applications require precise placement of
the temperature sensor, such as measuring the temperature
of a flow at the bottom of a stream or river. Ensure that the
logger is appropriately secured so that the temperature
sensor is in the desired measurement location.
Important: The plastic case will become brittle at temperatures
lower than -20°C. If the logger is deployed in a location where
the temperature drops below -20°C, make sure the logger
remains stationary and is not pulled on or struck. Return the
logger to above -20°C before handling.
•The opening at the sensor end of the logger accepts 1/4 inch
(6.35mm) diameter nylon cord or other strong cable. If wire
is wrapped through the sensor end to secure the logger,
make sure the wire loop is snug to the sensor end. Any slack
in the loop may cause excessive wear.
•The logger is slightly positive buoyant so that it will float if it
is inadvertently dropped in the water or breaks free from its
mooring. You may want to mark or label the logger with
contact information in case the logger is lost.
•Onset recommends an optional boot (Part # BOOT-BLK or
BOOT-WHT) for high fouling environments and for protection
against very cold temperatures (which can make the case
brittle and prone to fracture) or repeated pounding and
abrasion caused by turbulent flow. The boot slides over the
logger, has a removable end cap, and is flexible enough to
allow you to attach the coupler without removing the boot.
To attach the base station, remove the end cap and firmly
insert the logger until the boot folds back. Insert the logger
into the coupler so that the bump on the logger slides into
the groove of the coupler as shown on page 2.
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.
•An alternative to the optional boot in high fouling
environments is to protect the logger with plastic wrap that
can be removed and replaced as needed.
•This logger should not be immersed for extended periods in
any liquid other than fresh or salt water. To do so may void
the warranty (refer to the Service and Support section). If
you have any questions about chemical resistance, call
Onset.
•Prolonged exposure to chlorinated water is not
recommended.
•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
communications window.
Battery
The battery in the HOBO Water Temp Pro v2 is a 3.6 Volt
lithium battery. The battery life of the logger should be about
six years. Actual battery life is a function of the number of
deployments, logging interval, and operation/storage
temperature of the logger. To obtain a six-year battery life, a
logging interval of one minute or greater should be used and
the logger should be operated and stored at temperatures
between 0° and 25°C (32° and 77°F). Frequent deployments
with logging intervals of less than one minute, and continuous
storage/operation at temperatures above 35°C, will result in
significantly lower battery life. For example, continuous logging
at a one-second logging interval will result in a battery life of
approximately one month.
The logger can report and log its own battery voltage. If the
battery falls below 3.1 V, the logger will record a “bad battery”
event in the datafile. If the datafile contains “bad battery”
events, or if logged battery voltage repeatedly falls below 3.3 V,
the battery is failing and the logger should be returned to Onset
for battery replacement.
To have your logger’s battery replaced, contact Onset or your
place of purchase for return arrangements. Do not open the
case or attempt to replace the battery yourself. There are no
user-serviceable parts inside. If you open the case, the warranty
will be voided, and the logger may no longer be waterproof.
WARNING: Do not cut open, incinerate, heat above
100°C (212°F), or recharge the lithium battery. The battery
may explode if the logger is exposed to extreme heat or
conditions that could damage or destroy the battery case.
Do not dispose of the logger or battery in fire. Do not
expose the contents of the battery to water. Dispose of the
battery according to local regulations for lithium batteries.
sensor
mounting hole
communications
window
