The Position at power on parameter allows you to set the position of the injection valve after power on. The default position is Mainpass. For gradient at low flows, the startup position of the injection valve should be set to Bypass to allow fast composition change.
During the startup phase with a G1377A High Performance Low Flow Autosampler configured, the system generates a pop-up message and gives further recommendations:
Bypass setting |
Recommended for executing fast composition change in the case of solvent change or 24h idle time. |
Mainpass setting |
Recommended for executing fast composition change in the case of solvent change or 24h idle time, and to set the Injection valve parameter to Bypass. |