78 1200 Series Quarternary Pump User Manual
7 Maintenance
Simple Repairs
Checking and Cleaning the Solvent Filter
Cleaning the Solvent Filter
1 Remove the blocked solvent filter from the bottle-head assembly and place
it in a beaker with concentrated nitric acid (35%) for one hour.
2 Thoroughly flush the filter with bidistilled water (remove all nitric acid,
some capillary columns can be damaged by nitric acid).
3 Replace the filter.
Small particles can permanently block the capillaries and valves of the module.
Damage of the module.
➔ Always filter solvents.
➔ Never use the module without solvent inlet filter.
If the filter is in good condition the solvent will freely drip out of the solvent tube
(hydrostatic pressure). If the solvent filter is partly blocked only very little solvent will drip
out of the solvent tube.
When If solvent filter is blocked
Parts required # Description
1 Concentrated nitric acid (35%)
1 Bidistilled water
1Beaker
Preparations • Remove solvent inlet tube from the adapter at the AIV
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