Hach RTC Standardized Combined Manuel D'installation page 14

Explosion hazard. Incorrect battery installation can cause the release of explosive gases. Be sure that the
batteries are of the same approved chemical type and are inserted in the correct orientation. Do not mix new and
used batteries.
Note: Make sure to replace the battery in less than 30 seconds to prevent the data loss of date and time settings. If
date and time settings are erased the device time will not be synchronized. Timer-controlled programs will stop or
will operate at the wrong time.
Set the device time again.
The service life of a backup battery is approximately 5 to 8 years, based on the operating conditions.
To replace the battery, refer to the illustrated steps that follow.
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