User manual

Bio-inert Quaternary Pump User Manual 131

Maintenance

Exchanging the Multi-Channel Gradient Valve (MCGV)

Tools required p/n Description

8710-0899 Screwdriver, Pozidriv #1

Parts required p/n Description

G5611-67701 Multi-Channel Gradient Valve (MCGV) (Bio-inert)

Preparations • Switch off pump at the main power switch

• Remove the front cover

• Use a solvent shutoff valve or lift up solvent filters in solvent reservoirs for avoiding leakages.

NOTE

The life time of the multi-channel gradient valve can be increased by regularly flushing the

valve, especially when using buffers. If using buffers, flush all channels of the valve with

water to prevent precipitation of the buffer, otherwise salt crystals could drop into an

unused channel and form plugs that may cause leaks of that channel. Such leaks will

interfere with the general performance of the valve. When using buffers in combination

with organic solvents in the Agilent 1260 Infinity Bio-inert Quaternary Pump it is

recommended to connect the aequous solutions/buffers to one of the bottom ports (A and

D) and the organic solvent to one of the upper gradient valve ports. It is best to have the

organic channel directly above the buffer channel (e.g., A - buffer, B - organic solvent).