Metrohm Power Box (for 899 Coulometer) - Manual (Page 14)

4.1 Start-up of the Power Box
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Power Box
4 Operation and maintenance
4.1 Start-up of the Power Box
Ensure that the following conditions are met before you put the Power
Box into operation together with the 899 Coulometer:
￭ The rear panel of the Power Box must be at least 10 cm away from
parts or devices that can generate sparks.
￭ The Power Box must be fully charged.
4.1.1 Charging the Power Box
When the Power Box is fully charged, the 899 Coulometer can be oper-
ated without a mains supply for at least 12 h. Once the charge drops
below a critical limit, you are prompted via a message on the coulometer
to charge the Power Box.
Fully charging the Power Box takes at least 14 h. If there is too little time
for charging after approximately 8 h of operation using the 899 Coulome-
ter, the Power Box can be charged once for 1 h. Afterwards the charge
will suffice for approximately another 8 h of operation. After that, how-
ever, the Power Box must be charged for at least 14 h.
To charge the Power Box, proceed as follows:
1 Plug in the plug for the power supply unit at the mains connection
socket (2-1) for the Power Box.
2 Connect the power supply unit to the mains supply using the mains
cable.
3 Switch on the Power Box.
4 Leave the Power Box connected to the mains supply for at least 14 h.
The Power Box cannot be overcharged, even if it is left connected to
the mains supply for more than 14 h.
Note
Switch the Power Box off if you are not using it together with the
899 Coulometer immediately after charging. This way you can
avoid an unnecessarily high self-discharge.