Chapter 8. Maintenance and Troubleshooting
Model PM880 Portable Hygrometer User’s Manual 151
8.10Recharging the Batteries
The PM880 is powered by a rechargeable NiMH battery pack. The batteries
must be charged 4-5 hours until the amber LED on the charger goes out, to
receive the maximum charge. When fully charged, the batteries provide 16
to 24 hours of continuous operation, depending on the probe type and
PM880 usage. An internal battery gauge indicates the remaining power in
the batteries.
Before you recharge the battery pack you must make sure the charger is
properly configured. Use the instructions below to properly charge the
battery pack.
8.10.1 Removing the Battery Pack
1. Make sure you are in a general-purpose location where you can safely
charge the pack.
WARNING! THE BATTERY PACK CAN BE INSTALLED AND REMOVED IN
HAZARDOUS AREAS. HOWEVER, IT MUST BE CHARGED IN
GENERAL-PURPOSE AREAS ONLY.
2. Remove the four thumb screws on the back panel of the PM880 that
secure the pack.
3. Lift the pack out of the unit.
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