Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 386)

<6. Maintenance>
6-33
IM 11B08A01-01E
CAUTION
The isothermal oven is extremely hot after turning off the power immediately. Keep the purging
air supplied for more than an hour after turning off the power. Keep hands away from the oven
components.
(3) Turn off the supplies of the purging air, carrier gas, hydrogen (or nitrogen) gas for
combustion, combustion air, and sample gas.
(4) Open the control unit door using a key included in the accessory kit.
(5) Remove the three couplings connected to the FID. When removing the couplings, label
them for ease of identifying the connections later.
(6) Remove the six screws from the cover of the electronics section in the oven unit by using a
hex wrench (an accessory) and open the cover.
(7) Remove the wires connected to the FID card from the connectors, and pull into the
isothermal oven through the bushing holes.
(8) Remove the two screws which fi x the FID.
(9) Install a new FID.
(10) Reconnect the wires and pipes in the reverse order of steps (5) to (8). Confi rm wiring and
perform a leak test.
<Replacement Parts>
Low temp. type K9194XA For normal usage (SUS316)
K9194XB Corrosion-resistant type (Hastelloy C)
High temp. type K9803UN For normal usage (SUS316)
K9803UQ Corrosion-resistant type (Hastelloy C)
F0229.ai
Mounting screws
Figure 6.29 FID
(5) Methanizer
The methanizer is used in conjunction with the FID to measure low-concentration carbon
monoxide or dioxide. See Figure 6.30.
(1) Stop the operation. (See “3.3.4 Stopping operation” for this procedure).
(2) Stop the supply of power.
2nd Edition : May 11, 2012-00
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