Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 398)

<6. Maintenance>
6-45
IM 11B08A01-01E
(5) Remove the two couplings connected to the restrictor. When removing the couplings, label
them for ease of identifying the connections later.
(6) Remove the two screws on the end of nuts at the pressure control chamber side and pull out
its fi xture.
(7) Hold the restrictor both from inside the isothermal oven and from the pressure controller
side using a set of tools, and remove the locknuts on the pressure controller side, then the
restrictor itself.
(8) Install a new restrictor in the reverse order of step (4) to (7). Set the values described in the
Operation data by using the control knob of the restrictor and perform the leak test on the
piping.
IMPORTANT
After the isothermal temperature of the oven unit becomes substantially stable, again set the fl ow
rate of the restrictor according to the Operation data.
<Replacement Parts>
The nuts and sleeves are not included.
K9409CA For low-temperature applications
K9409CB For high-temperature applications
F0235.ai
Restrictor
Pipe
IN
OUT
IN
Figure 6.35 Restrictor
(9) Columns in Isothermal Oven
(1) Stop the operation. (See “3.3.4 Stopping operation” for this procedure).
(2) Turn off the detector.
• TCD: Turn off the detector on Manual operation display.
• FID, FPD: When using hydrogen as the carrier gas, turn off the supplies of combustion air
and nitrogen or helium gas for make-up.
When using carrier gas other than hydrogen, turn off the supply of hydrogen gas
for combustion.
2nd Edition : May 11, 2012-00
6