PL-GPC 220 User Manual 33
Using the Module
4
The Graphical User Interface
Modes of Operation
The PL-GPC 220 will be in one of the following operation modes:
• STANDBY – indicated by a RED LED on both the interface and the
instrument display panel is the boot-up mode, in which all modules are off.
This is the mode of operation the PL-GPC 220 is set for routine
maintenance, such as solvent or column exchange or in any circumstance
when the oven needs to be opened.
• IDLE – indicated by an AMBER LED. Use this mode to control the
instrument in order to maintain oven temperature and a low flow rate
(configurable, but typically set to 0.1 mL/min) so that the system is ticking
over but not running samples. The carousel heaters are also turned off by
default in IDLE mode.
• RUN – indicated by a GREEN LED, is the fully functional, operational mode.
The oven temperature is at set point, the flow rate is typically at
1.0 mL/min, the carousel heaters are on, and the instrument is ready to run
samples.
Following boot-up, the instrument will typically default to the STANDBY
mode, unless the instrument is switched off in either the IDLE or RUN mode,
in which case it will re-boot back into the mode it was switched off in.
Pump Flow Control
The pump flow can be manually switched on/off in two places: the first using
the on/off selection button in the pump module box, and the second is located
in the Manual Operation tab. Both options allow the pump flow to be
stopped/started in all three modes of operation.
RI Detector
•Autozero – initializing the RI autozero function is a procedure, which should
be performed after a purge cycle.
•Purge – open purge valve on RI reference cell (the length of RI purge is set in
the RI configuration window). This procedure will de-stabilize the system; it
is recommended that the baseline be monitored and if excessive drift is
noticed then another purge cycle is performed. This procedure should be
repeated until a stable baseline is observed.
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