Metrohm Power Box (for 899 Coulometer) - Manual (Page 17)

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4 Operation and maintenance
Power Box
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4.3 Using the 899 Coulometer on an unstable power
supply
If you are working in an environment where only an unstable power sup-
ply is available, you can operate the 899 Coulometer as follows:
1 Connect the 899 Coulometer to the Power Box.
2 Plug in the 6.2164.010 power supply unit at the power socket (2-1)
for the Power Box and connect it to the power supply.
3 Switch on the Power Box.
4 Switch on the 899 Coulometer.
If the power supply fails, the Power Box takes over providing the 899
Coulometer with power. Once the charge drops below a critical limit,
you are 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. Depending on the availability of the power supply,
the coulometer is also shut down in a controlled way.
The Power Box ends up in charging mode no matter whether the coulom-
eter is switched on or switched off. You can tell by the LED on the front of
the instrument lighting up.