Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 128)

<2. Installation, Piping, and Wiring>
2-11
IM 11B08A01-01E
CAUTION
The following explosionproof requirements must be satisfi ed for hydrogen gas.
• No leakage
• Use a extra regulator to supply hydrogen gas to the analyzer at 500 kPa.
If the carrier gas contains moisture with a dew point of –60°C or above, it is recommended that a
desiccant, such as a molecular sieve, be used to remove moisture to prevent deterioration of the
columns.
Use stainless steel of O.D. 6 mm or 1/4 inch with any oil cleaned off.
CAUTION
Do not use solvents containing impurities such as non-volatile components to clean the inside
of the pipes. They will contaminate the inside of the pipes and prevent correct analysis. If it is
necessary to use a solvent for cleaning, use highly pure acetone.
(d) Instrument air pipe
These are the pipes for supplying air to the analyzer for actuating sampling and backfl ush valves
and for purging the inside of the electronics section and the ovens.
An air pressure of 350 to 900 kPa is required. Use general instrument air as the source and do
the piping to the analyzer PURGE AIR port. A pressure regulator should be installed in-between.
Use stainless steel of O.D. 6 mm or 1/4 inch with any oil cleaned off.
(e) Piping combustion air for FID/FPD
The FID/FPD air must not contain impurities that have an adverse effect on the analyzed results.
Use an air supply meeting the above condition and do the piping between this supply and the
analyzer BURNER AIR port.
Use stainless steel of O.D. 6 mm or 1/4 inch with any oil cleaned off.
(f) Piping combustion hydrogen gas for FID/FPD
Connect the piping between the outlet of the pressure regulator of a hydrogen gas cylinder and
the analyzer BURNER FUEL port. An extra-regular should be installed in-between at 500 kPa.
Use stainless steel of O.D. 6 mm or 1/4 inch with any oil cleaned off.
(g) Steam pipe
This is necessary for heating the sample with steam.
Connect the piping between a steam supply that can provide the required pressure (see
Operation Data) and the analyzer STEAM IN port.
(h) Venting pipes
These are used for backfl ush venting, forefl ush venting, detector venting, etc. With a vent header,
the piping is provided. Without a vent stack, install piping to the vent stack.
Use large pipes for venting to minimize pressure losses.
Connect venting pipes of 1/4 inch for FID/FPD or 1/8 inch for others to about a 2-inch header.
2nd Edition : May 11, 2012-00
2