Shimadzu 14A Gas Chromatograph FID from Matson Lab:

1
Shimadzu 14A Gas Chromatograph (FID) from Matson
Lab (by P. Jewett from P. Brooks, 2/02)
Load
Inject
FID
Helium (60 psi)
4
11
10
12
Methanizer
9
1
1
8
2
Hydrogen (60 psi)
7
2
Inject
Buffer Volume
6
3
2
5
4
Vent
2
2
5
Air (60 psi)
2 m 1/8 Haysep N
Parts (All fittings and lines must be stainless
steel pressure flow controllers cannot be
plastic because of offgassing issues) M1/8 OR M
Shimadzu M to 1/8 fitting 1 SS-100-R-2
1/8F to 1/16 M (Oakland Valve and fitting) 2
SS-200-6-1 1/8 to 1/16 union 3 SS-100-6
1/16 to 1/16 union 4 Shimadzu 221-22910-72 5
SS-100-3 1/16 tee 6 SS-200-R-4 1/4 F to
1/8 male union 7 SS-200-6 1/8 M unions
In Load mode Gas sample injected into port 7
goes to port 8 and then fills the 1mL sample loop
and excess is vented from port 6. Helium
carrier flows from port 9 gt 10 gt 3 gt 4 gt through
Haysep N column gt 11 gt 12 gt through
the methanizer gt 1 gt 2 gt through the buffer
volume and to the Flame Ionization Detector
(FID). In Inject mode When the valve is turned
to the dotted (inject) position, carrier gas goes
from port 9 to 8 and sweeps the sample through
port 5 to port 4 and onto the Haysep N column.
O2, N2, and Ar elute from the column first,
followed rapidly by CH4 and then, after a delay,
by sample CO2. O2, N2, and Ar and CH4 pass to
port 12 gt 1, through the buffer volume to the
FID so that CH4 is not affected by the
methanizer. CH4 goes through the FID and burns
to CO2 in the hydrogen flame, producing a
current. In Backflush (Load) mode At the point
when CO2 appears on the Haysep N column, the
valve is turned back to the load position (solid
lines). CO2 goes to port 12 to port 11, and to
the methanizer. Sample CO2 is mixed with H2
and passed over hot zinc in the methanizer where
it is reduced to CH4. This CH4 carries onto port
2, to port 1, to the buffer volume and to the
FID where it is burned to CO2 as described above.
through the backflush (Haysep N) column by
carrier gas coming from port 6 and they are
vented through port 1. Because CO2 is about 350
uL/L in air, but CH4 is only about 1.8 uL/L, the
CO2 response (after conversion to CH4) on the FID
is much greater than that of the CH4 (in air
samples).
Sample Chromatograph (integrate by peak height
rather than peak area)
Backflush
CO2
CH4
1 min
2 min