Hach-Lange HQ30D Basic User Manual - Manual (Page 14)

Replace the batteries
W A R N I N G
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.
For battery replacement, refer to Figure 10 . Make sure that the cover is
tightly closed to maintain the IP67 enclosure rating.
1. Pull the release tab on the battery cover and the remove the cover.
2. Remove the batteries.
3. Install 4 AA alkaline or 4 AA nickel metal hydride (NiMH) batteries.
Make sure that the batteries are installed in the correct polarity.
4. Replace the battery cover.
Figure 10 Battery replacement
1 Batteries 2 Release tab 3 Battery cover
Troubleshooting
Refer to the following table for common problem messages or
symptoms, possible causes and corrective actions.
14 English