Varian 450-GC, User Manual

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Warranty Warranty
Page:II Page:II User User Manual Manual 450-GC 450-GC Varian, Varian, Inc. Inc.
Read Before Operating Read Before Operating
Important Safeguards Important Safeguards
The following items are frequently not recognized or are overlooked by new users while learning The following items are frequently not recognized or are overlooked by new users while learning
to operate a Gas Chromatograph.
to operate a Gas Chromatograph.
They are brought to your attention to safeguard against damage to your equipment.
They are brought to your attention to safeguard against damage to your equipment.
1. 1. Carrier gas Carrier gas must be must be flowing through the flowing through the column before column before heating the heating the column column
oven. Carefully evaluate columns that have been heated with no carrier gas oven. Carefully evaluate columns that have been heated with no carrier gas
flowing through and discard, if damaged. Ensure the Injector contains a septum
flowing through and discard, if damaged. Ensure the Injector contains a septum
and there is a positive
and there is a positive flow of carrier flow of carrier gas before heating the column. gas before heating the column.
2. 2. Become fa Become familiar with th miliar with the location e location and id and identity of Inje entity of Injector and de ctor and detector optio tector options ns
prior to making settings at the prior to making settings at the GC keyboard and pneumatics pane GC keyboard and pneumatics panel. For l. For
example, determin example, determine the physical location of the e the physical location of the Injector you want to use Injector you want to use (front, (front,
middle, or rear) and identify the specific middle, or rear) and identify the specific pneumatic controls associa pneumatic controls associated with it ted with it
(Electronic Flow Control). Similarly, determine the physical location of the (Electronic Flow Control). Similarly, determine the physical location of the
detector you want to use and identify t
detector you want to use and identify t he specific pneumatic controls for this he specific pneumatic controls for this
detector. detector.
3. 3. Heating Heating an ECD an ECD to elevate to elevated tempe d temperatures witho ratures without carrier ut carrier or make or make-up gas -up gas
flowing through it can damage the ECD cell. flowing through it can damage the ECD cell. This can happen inadvertently This can happen inadvertently
especially when the ECD is not in especially when the ECD is not in use. For this use. For this reason, it is recommended that reason, it is recommended that
a low flow of a low flow of carrier or make-up gas be maintained through an ECD at carrier or make-up gas be maintained through an ECD at all times. all times.
4. 4.
If your system has If your system has a TCD, gas must a TCD, gas must be flowing through both channels to protect be flowing through both channels to protect
the filaments. Turn power to filaments off when not the filaments. Turn power to filaments off when not in use. in use.
Important Tips Regarding 450-GC Operation Important Tips Regarding 450-GC Operation
••
If a If a potentially potentially hazardous hazardous Error is Error is detected, detected, such such as a as a thermal thermal runaway, runaway, the the
450-GC shuts down the affected component and reports the 450-GC shuts down the affected component and reports the Error Error on page 84 on page 84 ..
After correcting the E After correcting the Error, normal ope rror, normal operation is restore ration is restored by powering d by powering the 450-GC the 450-GC
OFF then ON. OFF then ON.
••
Using Using cryogenic column oven cooling cryogenic column oven cooling ,, on page 73 on page 73 l l eave always the Injectror(s) eave always the Injectror(s)
/ Detector(s) heating ON (enable) and at a / Detector(s) heating ON (enable) and at a temperature of at least 100 °C. temperature of at least 100 °C.