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HOBO Pendant Temperature Data Logger (UA-001-xx) Manual 

 

 

1-800-LOGGERS (564-4377) • 508-759-9500 

www.onsetcomp.com/support/contact 

© 2011–2018 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 

9531-O 

 

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. 

 

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