Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 380)

<6. Maintenance>
6-27
IM 11B08A01-01E
(3) Turn off the supplies of the FID hydrogen (or nitrogen) gas for combustion, FID combustion
air, and carrier gas.
(4) Remove the cover by removing the two screws of the pressure/fl ow control section.
(5) Remove two coupling nuts connected to the IN and OUT ports of hydrogen limiting unit, as
well as the tube connected to the pneumatic valve.
(6) Remove the two screws which fi x the hydrogen limiting unit.
(7) Install a new hydrogen limiting unit in the reverse order of steps (3) and (4).
Replace the entire hydrogen limiting unit (part number: K9803WA).
(8) Confi rm that the pipe connections are correct. Then check the piping for leaks.
(9) Set the pressure of hydrogen fed into the hydrogen limiting unit to 490 kPa.
<Replacement Parts>
K9803WA
Plumbing Nut (two)
Mounting Screw (two)
Mass Flow Controller
Pneumatic Valve
Inlet
Side
Outlet
Side
Figure 6.25 Hydrogen Limiting Unit
6.2.4 Components for Isothermal Oven
The instructions for replacing the following parts in the isothermal oven are explained.
(1) Heater
(2) Sensor
(3) TCD
(4) FID
(5) Methanizer
(6) Rotary valve and valve seat
(7) LSV
(8) Restrictor
(9) Column
(10) Flame
Arrestor
(11) Gasket
(12) Air
Turbine
2nd Edition : May 11, 2012-00
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