Metrohm Power Box (for 899 Coulometer) - Manual (Page 15)

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4 Operation and maintenance
Power Box
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4.1.2 Displaying the charge
The state of charge is displayed on the Power Box itself and on the 899
Coulometer's display.
"On" LED on the Power Box
If the Power Box is connected to the mains supply and is switched on, the
LED indicates that the Power Box is in charging mode by lighting up. If the
Power Box is fully charged, the LED's light intensity increases.
If a fully charged Power Box is switched on, it takes approximately 10 s
until the LED displays the full charge by switching to a higher light inten-
sity.
Battery symbol on the 899 Coulometer's display
You can track the Power Box's state of charge using the four-level battery
symbol on the 899 Coulometer's display. This symbol is displayed in the
main dialog and during live display of the conditioning:
When the Power Box is in charging mode, the battery symbol fills from
right to left. If the 899 Coulometer is being operated using the Power Box,
the battery symbol empties in the opposite direction.
4.2 Operating modes
The Power Box can be operated with the 899 Coulometer in different
modes. Below you can find all of the operating modes the Power Box can
be operated in.
Power failure mode
￭ The power supply unit is connected to the Power Box and to the mains
supply.
￭ The Power Box is switched on.
￭ The 899 Coulometer is connected to the Power Box.
￭ The 899 Coulometer is switched on.
If the mains supply fails, the Power Box takes over continuing operation of
the 899 Coulometer (see Chapter 4.3, page 11).
Charging mode
￭ The power supply unit is connected to the Power Box and to the mains
supply.
￭ The Power Box is switched on.
￭ The 899 Coulometer is connected to the Power Box.