HOBO U12 Stainless Temperature Data Logger (U12-015 and U12-015-02) Manual
© 2003–2017 Onset Computer Corporation. All rights reserved. Onset, HOBO, and HOBOware are registered trademarks of
Onset Computer Corporation.
All other trademarks are the property of their respective companies.
This product has been manufactured by Onset Computer Corporation and in compliance with Onset’s ISO 9001:2008
Quality Management System.
7938-K MAN-U12-015
4. If the logger has never been connected to the computer
before, it may take a few seconds for the new hardware to
be detected.
5. Use the logger software to launch the logger. (The first time
you launch the logger, the deployment number will be
greater than zero. Onset launches the loggers to test them
prior to shipping.)
6. You can read out the logger while it continues to log, stop it
manually with the software, or let it record data until the
memory is full. Refer to the software user’s guide for
complete details on launching, reading out, and viewing
data from the logger.
IMPORTANT
: USB communications may not function properly
at temperatures below 0°C (32°F) or above 50°C (122°F).
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, the temperature every minute). Events are
independent occurrences triggered by a logger activity. Examples
of events recorded asynchronously during deployment include
when the logger is connected to the host, when the battery is
low, and the end of a data file once the logger is stopped. The
logger stores 64K of data, and can record up to 43,000 samples.
Mounting
A 4.8 mm (3/16 inch) diameter hole is provided in the end-cap
to secure the logger to an object.
Food-Grade Compliance
The logger components meet US Food and Drug Administration
(FDA) guidelines as follows:
•
Logger case: 316 series stainless steel is GRAS by the FDA
and meets NSF 51 & 61 requirements.
•
EPDM O-ring: Meets FDA 21 CFR 175.2600
•
Lubricant (applied to O-ring): Meets FDA 21 CFR 175.300
and NSF 51 & 61 requirements
Care and Maintenance of the logger
The logger is shipped with an installed EPDM O-ring and with a
replacement O-ring kit, containing both EPDM and Viton O-
rings. Refer to the following chart to determine which type of
O-ring is appropriate for your application.
O-ring type:
Use with:
Do not use with:
EPDM (Black)
Hot water, steam, food-
grade applications
Petroleum oils
Viton (Brown)
Petroleum oils
Hot water, steam,
food-grade
applications
The logger can be permanently damaged by internal corrosion
from condensation or foreign matter entering the case. The
logger electronics depend upon the integrity of the O-ring seal
for protection. Prior to every deployment, the O-ring should be
inspected for cracks or tears, and for proper lubrication. The O-
ring’s surface should be smooth and lightly lubricated. If
needed, the O-ring should be re-lubricated or replaced. In
addition, the end-cap must be securely in place with no visible
gap between the housing and the end-cap. Before opening the
end-cap for read out, make sure that the logger is clean and
dry. The logger should always be capped when it is not
connected to the computer.
316L stainless steel has good corrosion resistance, but it can be
damaged by contact with dissimilar metals or through crevice
corrosion. The logger should not be deployed in salt or brackish
water, or the housing will eventually fail and water will destroy
the electronics. If long-term deployment in salt water is
required, place the logger in a sealed bladder containing a non-
corrosive liquid. Always rinse the logger with fresh water after
deployment in salt or brackish water.
On the U12-015-02, the 5-inch piercing probe can be bent
and/or broken with excessive force. Damage to the 5" probe is
expressly not covered by the product warranty, and cannot be
repaired.
Note! Static electricity may cause the logger to stop logging.
To avoid electrical static discharge (ESD), transport the logger
only with its end-cap on, or in an anti-static bag. Ground
yourself by touching an unpainted metal surface before
handling the logger. For more information, search for “static
discharge” on www.onsetcomp.com.
Battery
Expected battery life varies based on the temperature and the
frequency at which the logger is recording data (the logging
interval). With 60 minutes of operation at 125°C (257°F) per
day, a new battery will typically last approximately three years
with logging intervals greater than one minute. Deployments in
extremely cold or hot temperatures or logging intervals faster
than one minute may significantly reduce battery life.
The logger has the ability to 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.
Do not attempt to replace the battery. If the battery needs to
be replaced, contact Onset or an Onset Authorized Dealer for
factory replacement battery service.
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.
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