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6
Preventive Maintenance and Repair
Solvent Delivery System
Checking and Cleaning the Solvent Filter
WA R N I N G
Small particles can permanently block the capillaries and valves of the pump.
Damage to the Agilent 1220 Infinity LC pump
➔ Always filter solvents.
➔ Never use the pump without solvent inlet filter.
NOTE
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.
Cleaning the Solvent Filter
When
If solvent filter is blocked
Parts required
#
Description
1
Concentrated nitric acid (35%)
1
Bidistilled water
1
Beaker
Preparations
Remove solvent inlet tube from the Inlet Valve.
1 Remove the blocked solvent filter from the bottle-head assembly and place
it in a beaker with concentrated nitric acid (65%) 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.
1220 Infinity LC
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