Teledyne GC-Pro/FID - Gas Chromatograph User Manual

Page 42

Installation GC-Pro

FID

Teledyne

Analytical

Instruments

optional purge (not shown) and sensor vent fittings are 1/4” while all
other gas connections are 1/8”.

It is recommended that all gas tubing leading to the connections on

the back of the analyzer be of the coiled type. This will facilitate sliding
the unit out of the case without disconnecting the gas supply to the
analyzer.

Before tubing is connected to the system, it must be decontaminated

to eliminate any hydrocarbon deposits. Using a small torch, heat each
length of tubing while passing nitrogen through it until it glows red.
Begin at the nitrogen source end and proceed down the length of the
tube, “chasing” the red glow (and hydrocarbon deposits) down to the
open end of the tube. Cap the tubing while not in use with suitable non-
contaminating caps.

All sample, calibration, and supporting gas lines, which deliver gas

to the analyzer, must be decontaminated before connection; vent lines do
not.

When connecting the various gas lines to the system, be absolutely

certain that no “dead ends” are left; that is, no unused branch lines
should be left capped off, where pockets might form of material that is
not representative of the current contents of the line, or which might
keep contaminants from being purged out of the system.

CAUTION:

THE GASES USED MUST BE OF THE HIGHEST
QUALITY, ULTRA ZERO GRADES, AS SHOWN
BELOW. FAILURE TO DO SO WILL RESULT IN
CONTAMINATION AND FAILURE TO DETECT AT
THE REQUIRED ACCURACY.

AIR:

USE WATER PUMPED AIR WITH THC LESS THAN
0.1 PPM. DO NOT USE OIL PUMPED AIR UNDER
ANY CIRCUMSTANCES.

FUEL:

HYDROGEN GAS, 100%, ZERO QUALITY WITH THC
LESS THAN 0.5 PPM.

CARRIER GAS: NITROGEN GAS, ULTRA ZERO GRADE WITH THC

LESS THAN 0.05 PPM.

Normally, four supporting gases of different composition (see

Section 4.1: Equipment) will be required to operate the analyzer. The
recommended composition is specified Appendix C: Addendum and
Testing Results. The gases should be supplied from cylinders that are