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Installation
10
Gas Connections
Remember these three points discussed earlier: (1) all surfaces that contact
the gas stream must be glass or stainless steel; (2) do not use copper tubing
or brass fittings; and (3) all tubes must be thoroughly cleaned and baked
before use. The installation instructions below assume that the detector
carrier will be supplied from a nearby cylinder. If your installation is different,
you may need to modify the instructions appropriately. Consult the VICI
catalog or vici.com for any fittings and tubing required.
The figures below illustrates gas connections for a typical TCD2 detector
system, in referenced and unreferenced modes. Since the distance from the
carrier supply to the GC varies from installation to installation, we do not
supply tubing to go from that point to the GC.
CHANNEL
A
VENT
CHANNEL A
INLET
(gold ferrule)
COLUMN
GAS CHROMATOGRAPH
Figure 7: Referenced mode (A - B)
CHANNEL
A
VENT
CHANNEL A
INLET
(gold ferrule)
COLUMN
COLUMN
GAS CHROMATOGRAPH
Figure 8: Unreferenced mode
CHANNEL
B
VENT
DETECTOR
CHANNEL B
INLET
(stainless ferrule)
TEE
(ZT1)
FLOW
CONTROLLERS
INJECTOR
CHANNEL
B
VENT
DETECTOR
CHANNEL B
INLET
(stainless ferrule)
INJECTOR
INJECTOR
PURIFIER
CARRIER GAS
(99.999% purity)
PURIFIER
TEE
(ZT1)
CARRIER GAS
(99.999% purity)
FLOW
CONTROLLERS
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