Caution – Yokogawa GC8000 Process Gas Chromatograph User Manual
Page 395
<6. Maintenance>
6-42
IM 11B08A01-01E
Heater or temperature sensor
(1) Stop the operation. (See “3.3.4 Stopping operation” for this procedure).
(2) 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.
(3) Open the control unit door using a key included in the accessory kit.
(4) Remove the terminal block cover and disconnect the wires (two for the heater and four for
the temperature sensor) connected to the component from the terminal block.
(5) Remove the screws on the heater and the temperature sensor.
(6) Pull out the parts to replace.
(7) Install a new component and fi x it with the screws.
(8) Reconnect the wires. Reinstall the terminal cover in its original location.
LSV
(1) Stop the operation. (See “3.3.4 Stopping operation” for this procedure).
(2) Turn off the supply of the sample.
(3) If the sample is liquid, purge the sample line with the purge gas (nitrogen gas or instrument
air).
• When the stream switching valve is a pneumatic valve, change the analyzer status to
Manual and turn on the stream switching valve on the sample line to let the purge gas fl ow
in.
• When the stream switching valve is a stop valve, close all the stop valves and open the stop
valve on the sample line to let the purge gas fl ow in.
(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.
(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.
2nd Edition : May 11, 2012-00