Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 384)

<6. Maintenance>
6-31
IM 11B08A01-01E
(3) Turn off the supplies of the purging air, carrier and sample gas.
(4) Open the control unit door using a key included in the accessory kit.
(5) Remove the two screws to remove the TCD cover.
(6) Remove the insulator.
(7) Remove the four couplings connected to the TCD. When removing the couplings, label
them for ease of identifying the connections later.
(8) Remove the four wires connected to the TCD terminals.
IMPORTANT
The direction of the TCD depends on the type of carrier gas. See the inscription on the TCD.
Carrier gas Inscription
H
2
, He H N
N
2
, Ar N H
(9) Remove the two screws which fi x the TCD.
(10) Install a new TCD.
(11) Reconnect the wires and pipes in the reverse order of steps (4) to (9). Confi rm wiring and
perform a leak test.
 High-temp. type TCD
(1) Stop the operation. (See “3.3.4 Stopping operation” for this procedure).
(2) Stop the supply of power.
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 and sample gas.
(4) Open the control unit door using a key included in the accessory kit.
(5) Remove the two screws to remove the TCD cover.
(6) Remove the insulator.
(7) Remove the wires connected to the TCD card from the connectors, and pull into the
isothermal oven through the bushing holes.
(8) 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.
(9) Remove the four couplings connected to the TCD. When removing the couplings, label
them for ease of identifying the connections later.
(10) Remove the two screws which fi x the TCD.
(11) Install a new TCD.
(12) Reconnect the wires and pipes in the reverse order of steps (4) to (8). Confi rm wiring and
perform a leak test.
<Replacement Parts>
Low temp. type K9192QA For normal usage (Aluminum)
K9192QB Corrosion-resistant type (SUS316)
K9192QJ High-sensitivity type (Aluminum)
2nd Edition : May 11, 2012-00
6