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3.5
Shutdown
Before shutting down the Dionex PDA for more than 24 hours, flush the system
with deionized water or methanol for at least 15 minutes at 1.0 mL/min (or
maintain a continuous flow at 0.2 mL/min). This rinses corrosive acids, salts, or
bases from the flow paths.
The Smart Shutdown feature in Chromeleon 7 or Chromeleon 6.8 can assist you
in creating and running a shutdown or standby procedure.
•
The shutdown process shuts down the system by automatically stopping the
pump flow, turning off the detector lamps, and turning off heating in any
temperature-controlled devices that are installed.
•
The standby process lets you quickly restart the chromatography system from
standby. A typical standby process includes steps such as reducing the pump
flow rate and turning off heating in temperature-controlled devices. While the
system is in standby mode, the detector lamps remain on.
Both processes maintain the equilibrated status of an instrument until the system
is restarted.
3.6
Routine Maintenance
The following maintenance procedures may be performed by users. All other
maintenance procedures for the Dionex PDA must be performed by Thermo
Fisher Scientific personnel.
•
Periodically check the drain tube connected to the leak tray at the bottom of
the optical bench. Verify that the tubing is unclogged and that it is routed
below the leak tray.
•
Periodically check all tubing and fittings and replace as necessary (see
Section
5.1). Tubing and fitting components may eventually become loose
and leak, or pinched off and plugged. Look for these symptoms:
Decreasing pressure; this may indicate a leak.
A sudden increase in backpressure; this may indicate plugged tubing. (A
gradual increase in backpressure is normal as the separator column ages.)
To troubleshoot, bypass the column and then start the pump; the
backpressure should decrease substantially.
Doc. 065378-01 1/12
3 • Operation and Maintenance
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