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Maintenance
Replacing Batteries
The HOBO U14 requires three AAA batteries. Onset Computer Corporation strongly recommends the use of fresh alkaline
batteries. Batteries should be replaced when the BATT LEVEL bar graph is down to one segment, which indicates 20% battery life
or less. To ensure data integrity, use HOBOware to read out the logger and stop logging before changing batteries.
Replacing the Internal RH Sensor (Model U14‐001 Only)
The internal relative humidity sensor in the U14‐001 logger may require replacement if it is damaged mechanically or by
exposure to condensation or chemicals. The replacement sensor (Part No. HUM‐RHPCB‐3A) is available from Onset or an Onset
Authorized Dealer for U14‐001 loggers with serial numbers above 9847173. Note: U14‐001 loggers with a serial number below
9847173 require a different replacement sensor (Part No. HUM‐RHPCB‐3). You can replace the internal RH sensor yourself or
have it replaced as part of a U14‐001 tune‐up/calibration service (available from Onset). Contact Onset for more details.
HOBO U14 Data Logger User Manual
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Onset Computer Corporation
Pocasset, MA 02559‐3450
Phone: 1‐800‐LOGGERS (1‐800‐564‐4377) or 508‐759‐9500
Hours of Operation: 8 AM to 5 PM ET, Monday through Friday
Email: loggerhelp@onsetcomp.com
www.onsetcomp.com
Mailing Address:
P.O. Box 3450
Fax: 508‐759‐9100
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