Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 39)

<1. Overview>
1-12
IM 11B08A01-01E
1.3 Auxiliary Hardware
(1) Cylinders (carrier gas, standard gases, etc.)
These cylinders are fi lled with a carrier gas or standard gas.
The maximum fi lling pressure is limited to 15 MPa considering the strength of the cylinders.
(2) Regulator for cylinder
This valve reduces a cylinder pressure to a safe degree to facilitate handling. The valve is directly
mounted to the cylinder.
(3) Stop valve
This valve shuts down the lines for the sample gas, instrument gas, and so on. It is operated
manually.
(4) Dehumidifi er
Any moisture in the carrier gas affects the columns. Therefore, if the carrier gas contains
moisture over 10 ppm, it is recommended to use a desiccant, such as a molecular sieve, to
prevent deterioration of the columns.
(5) Vent stacks
These are pipes to discharge sample bypass vent, sample vent, backfl ush vent, forefl ush vent,
detector vent, measurement gas vent, and others to the atmosphere collectively.
Direct the exhaust gas to an area where the gas suffi ciently disperses and diffuses before
discharging.
(6) Regulator for sample
This valve reduces the sample pressure to a specifi ed degree.
To vaporize a liquid sample, use a regulator with a steam-heated vaporizer.
(7) Pipings
The pipes for the sample inlet, carrier gas inlet, standard gas inlet, air for valve driving, air for
FID/FPD, FID/FPD hydrogen, steam, sampling bypass, and various vents are provided.
(8) Joints
The joints are used to connect pipes.
1.4 Gases Required for Operation
The following gases are required for the analyzer:
(1) Sample gas
The gas to be analyzed from the process line
(2) Carrier gas
Prepare a gas cylinder for the carrier gas. Keep spare cylinders at hand, too.
2nd Edition : May 11, 2012-00