Notes On Operating The High-Pressure Pump; Servicing The High-Pressure Pump - Metrohm 930 Compact IC Flex ChS Manual

5.5 Notes on operating the high-pressure pump

5.5 Notes on operating the high-pressure pump
5.6

Servicing the high-pressure pump

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54
CAUTION
The pump head is filled ex works with methanol/ultrapure water. Ensure
that the eluent used is miscible with this solvent.
Keep the following recommendations in mind in order to protect the high-
pressure pump from damage as much as possible during operation:
To protect the high-pressure pump from foreign particles, we recom-
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mend filtering the eluent through a filter with a pore size of 0.45 µm
and aspirating it via an aspiration filter (6.2821.090).
Ensure that no precipitates can form when changing the eluent. Salt
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crystals between the piston and seal cause abrasive particles that can
find their way into the eluent. These particles lead to contaminated
valves, an increase in pressure and, in extreme cases, scratched pistons
and thus to leakages in the high-pressure pump.
Immediately successive solutions must always be miscible. If the system
must be rinsed with organic solvents, use several solvents with rising or
falling lipophilicity.
In order to protect the pump seals, ensure that the pump is never oper-
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ated dry. Therefore ensure that the eluent supply is correctly connected
and that there is enough eluent in the eluent bottle each time before
turning on the pump.
NOTE
You can find a video sequence for this task in the Multimedia Guide IC
Maintenance or on the Internet at http://ic-help.metrohm.com/.
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930 Compact IC Flex ChS (2.930.1200)