Caution – Yokogawa GC8000 Process Gas Chromatograph User Manual

Page 399

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<6. Maintenance>

6-46

IM 11B08A01-01E

(3) Turn off the heater.

Turn off the heaters for the isothermal oven, LSV and FPD, from the Manual operation
display. (See “3.3.4 Stopping operation” for this procedure).

Wait until the PV (Present Value) on the Temperature Status display decreases to ambient
temperature.

(4) 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.

(5) Turn off the supply of the purging air, carrier gas. Wait until the pressure of carrier gas

decreases to 0 kPa.

(6) Open the control unit door using a key included in the accessory kit.
(7) Remove the screw and then remove the fi xture for the column.
(8) Remove the column by loosening two locknuts on both ends of the column. When removing

it, it is recommended to keep a note of the numbers labeled on the column and pipes to
avoid mixing up during installation.

(9) Remove the plug and install the new column. When installing it, check the numbers of the

column and pipes listed in the operation data (column system) or the note taken at step (8).

When treating mega-bore or capillary columns made from fused silica or metal, handle it
with care as follows and see How to Attach Fused Silica (or Metal) Capillary Column in the
operation data.

(A) • Do not pull the column hard.
• Do not twist the column.
• Do not scratch the column surface.
• Do not apply an impact on the column.
(B) When mounting on the gas chromatograph, keep at least 10 cm of curvature radius.

Bending at a smaller radius could result in column breakage.

Pay extra attention when connecting to LSV. The curvature radius tends to be less

than 10 cm.

See Figure 6.36

F0236.ai

Necked insert

Straight insert

Push against the end

<Without split>

<With split>

Approx. 5 mm

20 to 25 mm

Figure 6.36

(C) When connecting to rotary valves, insert the tip of the column approximately 5 mm into

the connector.

(D) When connecting a column, adjust the direction of the column ring on the column

hanger or the position of SUS piping to prevent the column from getting undue stress.

After passing the column tip through the column nut and the graphite ferrule, cut off the

column tip by 2 to 3 mm to avoid graphite dust from attaching to the tip.

2nd Edition : May 11, 2012-00

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