Filter:

A filter is normally placed in the line following the pump to remove fine particles of particulate material which can clog the inlet of the column. Generally a 2µ sintered stainless steel filter is adequate for this purpose.

Pressure monitoring device:

A device for monitoring the column input pressure should be inserted in the line between the pump and the chromatographic column. This pressure monitoring device indicates if there has been a plugging of the column or a failure of the pumping system.