For highest performance and robustness, the pump uses three solvent filters:
Solvent inlet filters (5041-2168) as part of G7120-60007 (Bottle Head Assembly, long (1730 mm)) have a large pore size of about 20 µm and filter out particles before they reach the pump.
An Outlet Filter (average pore size 5 µm; G4204-60004 (Outlet filter Quaternary Pump/Flexible Pump) or G7131-60004 (Outlet Filter Flex Biocompatible) ) between pressure sensor and Multipurpose valve filters out particles which may be created in the pump by wear of piston or wash seals.
This filter or filter frits can be replaced as required (see Replace the High Pressure Outlet Filter or Filter Frit).
An optional Inline Filter connected to the Multipurpose Valve with a small pore size of about 0.3 µm (5067-5407 (Inline filter assembly, material: stainless steel) or 5720-0003 (Bio Inline Filter for Infinity II Bio Flexible Pumps) ).
This filter can be flushed using the graphical user interface or replaced as required (see Replace Parts of the Inline Filter).
In the instrument control panel of Agilent user interfaces, use the context menu and select Flush Filter On, see also Context Menu.
The pump can be equipped with an additional inline filter (5067-5407 (Inline filter assembly, material: stainless steel) or 5720-0003 (Bio Inline Filter for Infinity II Bio Flexible Pumps) ) with a nominal filter pore size of 0.3 µm.
Advantages of the inline filter:
Very small internal volume
Specified for working at high pressures
Possibility of back flushing the filter
Using the inline filter is recommended:
To protect the downstream system from blockages,
For solvent combinations that can form precipitation after mixing,
For applications running with buffers.
General hints for effective use of the inline filter:
Filter solvents before use,
Follow best practices,
Back flush the filter weekly (Flush Filter in context menu figure),
Exchange the filter frit regularly (5023-0271 (Frit 0.3 µm for inline filter, 5/pk) , 5320-0022 (Frit 0.3 µm for inline filter, biocompatible, 5/pk) ).
NOTE
See 1290 Infinity II Inline Filters Technical Note (G7167-Inline-Filters-TechPu-en-SD-29000397.pdf, SD-29000397) for further reference.
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