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Ver.1.36
3.1.2 Pumping down MS (for saving installation time)
It is recommended that the GC/MS be shut down during the installation of the pyrolyzer; however, to
save time, the installation may be performed while the MS is pumping down.
If you have a Vent-free GC/MS adapter, install it first, pump down the MS and start the pyrolyzer
installation.
If a Vent-free GC/MS adapter is not used, connect the inlet of the supplied Ultra ALLOY column to
the GC injection port. Then after allowing the He carrier gas to flow through the column for 5 min,
connect the column outlet to the MS and start pumping down the MS. After ten minutes, disconnect
the column from the GC injection port and plug the column inlet with a septum, continue the MS
pump down.
A separation column for the pyrolyzer operational verification (Ultra ALLOY, 5% diphenyl 95% di-
methylpolysiloxane, L=30 m, id.=0.25 mm, df=0.25 µm) is supplied with the pyrolyzer as standard.
3.2 REPIPING CARRIER GAS LINE
The installation of the pyrolyzer onto a GC requires redirecting the carrier gas line. Fig. 3.1 shows the
carrier gas flow paths before and after the installation of pyrolyzer. Refer to this figure throughout the
installation steps.
Disconnect the carrier gas line that runs through the carrier gas controller to the GC injector port, and
reconnect it to the pyrolyzer. Plug the carrier gas line at the injection port with a cap nut. Depending on
your GC model, the carrier gas line may need to be cut.
Fig. 3.1 Carrier gas flow paths before and after installation of pyrolyzer
Carrier gas flow
controller
Before flow path modification
After flow path modification
Back pressure regulator
Cap nut
Carrier gas
flow oontroller
Joint
Pyrolyzer
