Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 409)

<6. Maintenance>
6-56
IM 11B08A01-01E
(4) Close all the stream switching valves.
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.
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) Remove the pipe connected to the elbow on the rear of the pressure gauge.
(6) Remove the two screws on the fi tting.
(7) Remove two nuts and two washers that fi x the pressure gauge to the fi tting.
(8) Remove the elbow connected to the pressure gauge.
(9) Install a new pressure gauge in the reverse order of steps (5) to (8). When attaching the
elbow, always apply sealing tape to the connection of the pressure gauge.
(10) Confi rm that there are no leaks.
L9867AG 0 to 0.2 MPa
L9867AJ 0 to 0.6 MPa
F0248.ai
Pressure gauge
Washer
(two)
Nut
(two)
Elbow
Screw (two)
Bracket
Figure 6.48 Pressure Gauge
(5) Pneumatic Valve for Actuating External Air Supply
See Figure 6.49 for the replacement procedure.
(1) Stop the operation. (See “3.3.4 Stopping operation” for this procedure).
2nd Edition : May 11, 2012-00