Bio-Rad ChromLab™ Software - Manual (Page 158)

A | Maintaining the Instrument
156 | NGC Chromatography Systems and ChromLab Software
System and Sample Pumps
The NGC system’s gradient pump system consists of two dual-piston pumps
(system pumps A and B). The pumps form linear salt gradients over a set volume or
period of time at a controlled flow rate.
The NGC system’s sample pump is a dual-piston pump used to load large sample
volumes onto a column or to fill large sample loops.
The system pumps and the sample pump are also equipped with a piston wash
system. The piston wash system continuously rinses the area behind the pump
seals to prolong the life of the pump head seal.
Components of the NGC Pumps
The illustrations in this section show the components of the pumps on the NGC
systems:
 Pump head assembly
 Pump head housing
 Pump head check valves, inlet and outlet
 Pump head seal and small washer
 Piston wash assembly
 Piston wash housing
 Left wash housing inlet and outlet check valves
 Right wash housing inlet and outlet tubing fittings
 Piston wash seal and large washer
 Sealing O-rings
 Pistons