Metrohm Power Box (for 899 Coulometer) - Manual (Page 18)

4.4 Using the 899 Coulometer not connected to the power grid
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Power Box
4.4 Using the 899 Coulometer not connected to the
power grid
If you are working in an environment without an available power supply,
you can operate the 899 Coulometer as follows:
1 Connect the 899 Coulometer to the fully-charged Power Box.
2 Switch on the Power Box.
3 Switch on the 899 Coulometer.
After 12 h of operation at the earliest, you will be prompted via a
message on the coulometer to charge the Power Box.
Note
If you continue to operate the coulometer after this message is
displayed without charging the Power Box, it will be switched off
automatically after a certain time. This automatic process prevents
a deep discharge of the Power Box during operation with a 899
Coulometer. The 899 Coulometer is shut down in a controlled
way.
4.5 Storing the Power Box
Caution
If the Power Box is not being used for an extended period, the batteries
may be damaged by a deep discharge. This also occurs if the Power Box
is switched off. The discharge can amount to 3% per month. Repeated
deep discharges can shorten the life of the batteries and lower their
capacity.
Avoid deep discharges and keep the following in mind:
￭ Ensure that the Power Box is fully charged before you put it in storage.
￭ Switch off the Power Box before you put it in storage.
￭ If you keep the Power Box in storage or do not use it for 12 months, it
must be charged after this period for at least 14 hours using the
6.2164.010 power supply unit.