Metrohm 914 pH / Conductometer - Manual (Page 24)

3.2 Power supply
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pH Meter/Conductometer
If no power socket is available, you can also charge your instrument via
the USB interface of a computer (PC) or a car charger adapter.
NOTE
Charging capacity
The charging process requires a minimum capacity of 500 mAh.
￭ Use a USB hub with external power supply or a suitable USB connec-
tor on the computer (PC).
￭ For mobile charging of the battery, use a car charger adapter from
the Metrohm accessories (6.2166.500).
1. Connect the USB cable first to the computer and then to your instru-
ment.
2. Then switch on the instrument.
3. As soon as the battery is fully charged, disconnect the USB cable first
from the instrument and then from the computer.
NOTE
Battery condition
The battery performance may deteriorate over time. If the operating
times are much shorter than usual, take the instrument to the closest
Metrohm Service to have the battery replaced.
3.2.2 Operation with power supply unit
You can operate the pH Meter/Conductometer with the supplied
power supply unit without restrictions.
CAUTION
Measuring with power supply unit connected
Inappropriate power supply units may influence and interfere with the
measuring signal.
Use only the supplied power supply unit (6.2166.100) for measuring.