Teledyne GC-Pro/FID - Gas Chromatograph - Manual (Page 43)

GC-Pro FID Installation
Teledyne Analytical Instruments 29
equipped with the type of regulator specified in the aforementioned
sections.
CAUTION: UNDER NO CIRCUMSTANCES SHOULD YOU
EMPLOY A REGULATOR THAT IS NOT EQUIPPED
WITH A METALLIC DIAPHRAGM ANYWHERE IN THE
SYSTEM.
The regulators should be inspected prior to installation to be sure
that they are oil-free. Failure to comply with these directives will result
in a constant drift in analyzer output, as organic compounds will outgas
into the plumbing system at a rate that is related to the ambient
temperature. Use 316 stainless steel, dual-stage stainless steel diaphragm
regulators only in fuel, sample, and blanket air lines; shutoff valves
should be used downstream from each regulator.
Place the supply cylinders as close to the analyzer as possible, and
connect to the analyzer with new tubing. Be sure that all plumbing
connections are free of leaks.
Note: Use only stainless steel tubing throughout the system.
Consult the assembly, piping, outline drawings, and any
Addenda included with this manual to determine if special
conditions apply.
3.3.3.1 E FFLUENT
All the gases introduced into the detection cell vent from one fitting
at the rear of the analyzer. TAI recommends that the cell be permitted to
vent directly to the atmosphere wherever possible.
If a vent line is required, the installation must include a drop-out pot
to collect the water that is formed by the burning of the hydrogen fuel.
The vent line must be constructed so that water and dirt cannot collect in
it.
3.3.3.2 S AMPLE B YPASS V ENT
The sample bypassed by the back-pressure regulation system vents
from a separate port at the rear of the analyzer. If a vent line is required,
it must be installed so that water and dirt cannot accumulate in it.