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Using the Pump
Purging Procedure
Purging Procedure
1 Ensure that an outlet tube is connected from the purge valve to a waste solvent bottle.
2 Open the purge valve.
3 Enter the Analysis screen.
4 Set the purge flow rate in the regular flow rate section of the Analysis screen, for
example, to 5 ml/min.
NOTE If a flow rate of more than 5 ml/min is used on a quaternary pump, redefine the upper
pressure limit to 200 bar (Accessible from the Analysis screen, press the Settings
button [F1], choose pump from the list and press the Enter key. Then choose More ...)
5 Set the first channel to be purged to 100%. We recommend you start with the organic
solvent channel first. Channel A will automatically be set to 100% when all other
channels are set to zero or OFF.
6 Turn on the pump using the On/Off button [F7] in the Analysis screen.
7 Wait until a continuous stream of solvent comes out of the outlet tube from the purge
valve.
8 Turn off the pump using the On/Off button [F7] in the Analysis screen and then close
the purge valve.
9 Repeat the procedure for the other channels you need to purge.
NOTE The channels of a pumping system are named A, B, C and D (depending on the pump
type). %A is automatically calculated by 100% - (%B + %C + %D). If no values for
%B, %C and %D are entered, %A is always 100%. To purge the pump you have to
go through steps 5 to 8 individually for each of the channels, setting the composition
to 100% for the channel to be purged.
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