Agilent InfinityLab LC Series Vialsamplers User Manual 174
5 Optimizing Performance
Precise Injection Volume
Draw and Eject Speed
Draw Speed
The speed at which the metering unit draws sample out of the vial may have an
influence on the injection volume precision when using viscous samples. If the
draw speed is too high, air bubbles may form in the sample plug, affecting
precision. The default draw speed is 100
µL/min. This speed is suitable for the
majority of applications, however, when using viscous samples, set the draw
speed to lower speed for optimum results. A DRAW statement in an injector
program also uses the draw speed setting which is configured for the
autosampler.
Eject Speed
The default eject speed setting is 400 µL/min. When using large injection
volumes, setting the eject speed to a higher value speeds up the injection cycle
by shortening the time the metering unit requires to eject solvent at the beginning
of the injection cycle (when the piston returns to the home position).
An EJECT statement in an injector program also uses the eject speed setting
which is configured for the autosampler. A faster eject speed shortens the time
required to run the injector program. When using viscous samples, a high eject
speed should be avoided.
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