User Manual

HOBO Pendant Temperature/Light Data Logger (UA-002-xx) Manual
1-800-LOGGERS (564-4377) • 508-759-9500
www.onsetcomp.com • [e-mail]
© 2009–2014 Onset Computer Corporation. All rights reserved. Onset, HOBO, Pendant, 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 9556-K MAN-UA-002
Battery
The logger requires one 3-Volt CR-2032 lithium battery. Battery
life varies based on the temperature and the frequency at
which the logger is recording data (the logging interval). A new
battery typically lasts one year 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. Continuous logging at the
fastest logging rate of one second will deplete the battery in as
little as two weeks.
Replacing the Battery
Before you begin: You will need a small Philips head
screwdriver and silicone-based O-ring grease, such as Parker
Super-O-Lube, to complete these steps (no petroleum-based
lubricants). The logger should be wiped clean and dried
completely before opening it.
To replace the battery:
1. Avoid electrostatic discharge while handling the logger and
internal circuit board; ground yourself by touching an
unpainted metal surface. Hold the circuit board by its edges
and avoid touching electronics.
2. Working on a clean, dry surface, remove the two screws
that secure the end cap to the case and remove the cap.
3. Examine the desiccant pack that is tucked into the cap. If
the desiccant is not bright blue, put the desiccant pack in a
warm, dry place until the blue color is restored. Or, for
faster drying, the desiccant can be dried for two hours in a
70°C (160°F) oven.
4. Gently tap the case to loosen the circuit board and remove
it from the case.
5. Carefully push the battery out of the holder with a small,
nonmetallic blunt instrument.
6. Insert a new battery, positive side facing up.
7. Return the circuit board and label to the case, carefully
aligning the circuit board with the grooves in the case so
that the battery faces the ridged side of the case.
8. Remove the O-ring from the end cap. Use the thumb and
finger of one hand to hold the cap from the top and
bottom, and use the thumb and fingers on your other hand
to slide the O-ring to form a loop as shown. Use this loop to
roll the O-ring off the cap.
9. Inspect the O-ring for cracks or cuts and replace it if any are
detected (the O-ring is included in the Pendant replacement
parts kit, UA-PARTSKIT).
10. Using your fingers (not cloth or paper), spread a small dot of
silicone-based grease on the O-ring, just enough to moisten
it all the way around and making sure that the entire O-ring
surface is completely coated with grease. As you work the
grease into the O-ring, make sure there is no grit or debris
on the O-ring.
11. Place the O-ring back on the end cap, making sure it is fully
seated and level in the groove. Make sure the O-ring is not
pinched or twisted and that no dirt, lint, hair, or any debris
is trapped on the O-ring. This is necessary to maintain a
waterproof seal.
12. Very slightly grease the inside rim of the case, especially
around the screw holes with the silicone grease, just
enough to moisten the inside edges without touching any
circuitry. Make sure that there is no excess lubricant that
could get onto the logger electronics or label. Make sure
there is no debris on this surface.
13. Check that the desiccant pack is tucked into the cap.
14. Carefully push the end cap into the lubricated case until the
screw holes are aligned. Visually check that the O-ring forms
a uniform seal all around.
15. Re-fasten the screws. Tighten the screws until you feel
them hit the bottom of the screw holes, but not so tight
that they distort the clear housing.
WARNING:
Do not cut open, incinerate, heat above
85°C (185°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.
O-ring on end cap, with
desiccant tucked inside
Logger case
Circuit board
Battery