Metrohm 806 Exchange Unit - Manual (Page 29)

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5 Handling and maintenance
806 Exchange Unit
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5 Handling and maintenance
5.1 Care and upkeep
The exchange unit needs appropriate care.
NOTE
Exchange units must be monitored regularly and cleaned from time to
time.
Monthly inspections are called for in the event that alkaline, corrosive or
high-concentration reagents are used. If non-problematic reagents are
used, then the inspection intervals can be extended to several months.
5.1.1 Disassembling the exchange unit
It is recommended to disassemble and clean the exchange unit when
replacing the reagent.
At the same time, the dosing piston and cylinder of the exchange unit can
be checked. When using alkaline, corrosive or high-concentration
reagents, it should be checked whether the glass cylinder has been
attacked by e.g. aggressive alkalis or whether solids have crystallized out
of the solution.
WARNING
Do not disassemble the exchange unit if it is still on the drive! Remove
the exchange unit from the control device before loosening the tubing
connections. Escaping reagents may access the inside of the device.
Proceed as follows:
1 Eject the reagent as far as possible without have the cylinder newly
filled.
2 Loosen the tubing connection on the reagent bottle.
3 Move the piston to zero position, i.e. carry out 'Filling'.
4 Remove the exchange unit from the drive.