Caution – Yokogawa GC8000 Process Gas Chromatograph User Manual
Page 390
<6. Maintenance>
6-37
IM 11B08A01-01E
IMPORTANT
• During the purge, purge gas may fl ow into the sample return line, causing pressure
fl uctuation.
Prepare the sample return line and collection tank, if necessary.
• Prepare the sample return line so that the sample does not return.
(5) 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.
(6) Turn off the supply of the purging air and the carrier gas. For a detection system with an FID,
turn off the supply of hydrogen (or nitrogen) gas and the combustion air as well.
(7) Open the control unit door using a key included in the accessory kit.
(8) Remove the coupling connected to the rotary valve. When removing the couplings, label
them for ease of identifying the connections later. The rotary valve is either a single-sleeve
or double-sleeve valve, depending on the specifi cations. Each type comprises four to six
pipes extending from the sleeve.
(9) Remove the two screws which are not painted with red enamel in order to disassemble the
rotary valve. Do not touch the two screws which are painted red.
(10) Remove two nuts to remove the gland assembly.
(11) Install a new gland assembly.
(12) Reinstall the rotary valve in the reverse order of steps (8) and (9). Reconnect the pipes.
(13) Perform a leak test on the piping.
<Replacement Parts>
K9034BP
for liquid samples (sample volume: 3 μl or less), SUS316
K9034BJ
for gas samples (sample volume: 10 μl), SUS316
K9034BH
for gas samples (sample volume: 25 μl), SUS316
K9034BG
for gas samples (sample volume: 50 μl), SUS316
K9034BB
for gas samples (sample volume: 360 μl or more), SUS316
K9034BA
for switching valve, SUS316
K9034AW for
plug
K9034GV
for liquid samples (sample volume: 3 μl or less), Hastelloy C
K9034GS
for gas samples (sample volume: 25 μl), Hastelloy C
K9034GR
for gas samples (sample volume: 50 μl), Hastelloy C
K9034GN
for gas samples (sample volume: 360 μl or more), Hastelloy C
K9034GX
for switching valve, Hastelloy C
For the following glands, contact Yokogawa.
1. When replacing gland with the nut and the sleeve (The glands listed above do not have a
nut and a sleeve).
2nd Edition : May 11, 2012-00
6