Operational Hints For The Multi Channel Gradient Valve (Mcgv) - Agilent Technologies 1200 Series Manual

Operational Hints for the Multi Channel Gradient Valve (MCGV)

In a mixture of salt solutions and organic solvent the salt solution might be
well dissolved in the organic solvent without showing precipitations. However
in the mixing point of the gradient valve, at the boundary between the two
solvents, micro precipitation is possible. Gravity forces the salt particles to fall
down. Normally the A channel of the valve is used for the aqueous/salt
solution and the B channel of the pump is used for the organic solvent. If used
in this configuration the salt will fall back into the salt solution and will be
dissolved. When using the pump in a different configuration (e.g., D - salt
solution, A -organic solvent) the salt can fall into the port of the organic
solvent and may lead to performance problems.
When using salt solutions and organic solvents in the Agilent 1200 Series Quaternary
N O T E
Pump it is recommended to connect the salt solution to one of the bottom ports and the
organic solvent to one of the upper gradient valve ports. It is best to have the organic
channel directly above the salt solution channel. Regular flushing with water of all MCGV
channels is recommended to remove all possible salt deposits in the valve ports.
1200 Series Quarternary Pump User Manual

Operational Hints for the Multi Channel Gradient Valve (MCGV)

Optimizing Performance
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