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HOBO State Data Logger (UX90-001x) Manual 

 

 

1-800-LOGGERS (564-4377) • 508-759-9500 
www.onsetcomp.com • [email protected]

 

© 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. 

15430-A MAN-UX90-001 

 

Protecting the Logger 

The logger is designed for indoor use and can be permanently 
damaged by corrosion if it gets wet. Protect it from 
condensation. If the message FAIL CLK appears on the LCD 
screen, there was a failure with the internal logger clock 
possibly due to condensation. Remove the battery immediately 
and dry the circuit board. It is possible to dry the logger with a 
hair dryer, but do not let the board get too hot. You should be 
able to comfortably hold the board in your hand while drying it. 

Note:

 

Static electricity may cause the logger to stop logging.

 

The logger has been tested to 8 KV, but avoid electrostatic 
discharge by grounding yourself to protect the logger. For more 
information, search for “static discharge” in the FAQ section on 
onsetcomp.com. 

Battery Information 

The logger is installed with a 3V CR2032 battery (HRB-TEMP). 
Expected battery life varies based on the temperature where 
the logger is deployed and the frequency (the logging interval 
and the rate of state changes and/or events) at which the 
logger is recording data. A new battery typically lasts 1 year 
with logging intervals greater than 1 minute and when the 
input signals are normally open or in the high logic state. 
Deployments in extremely cold or hot temperatures, logging 
intervals faster than 1 minute, or continuously closed contacts 
may reduce battery life. 

The logger can also be powered by the USB cable when the 
remaining battery voltage is too low for it to continue logging. 
Connect the logger to the computer, click the Readout button 
on the toolbar, and save the data as prompted. Replace the 
battery before launching the logger again. 

To replace the battery: 

1.

 

Open the battery door on the top of the logger. 

2.

 

Use the tab on the built-in battery removal tool inside the 
compartment to remove the battery. 

 
3.

 

Place the circular battery removal tool around the negative 
side of the new battery with the tab up. Insert the new 
battery with the positive side facing out. The LCD should 
display “HOBO” briefly after correctly installing the battery. 

 

 

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. 

HOBOware provides the option of recording the current battery 
voltage at each logging interval, which is disabled by default. 
Recording battery life at each logging interval takes up memory 
and therefore reduces logging duration. It is recommended you 
only record battery voltage for diagnostic purposes. Even with 
the channel disabled, a bad battery event will still be recorded. 

Tab on battery-removal tool

Battery door

CR2032 battery; 

positive side  

facing out 

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