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.

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