Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 381)

<6. Maintenance>
6-28
IM 11B08A01-01E
(1) Heater for Isothermal Oven
The heater uses a nichrome wire to control the temperature of the isothermal oven.
(1) Stop the operation. (See “3.3.4 Stopping operation” for this procedure).
(2) Stop the supply of power.
(3) Confi rm that the LED (Green) of “POWER” is OFF.
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.
(4) Turn off the purging air supply.
(5) Open the door of the isothermal oven section using a key included in the accessory kit.
(6) Disconnect the wiring to the heater from the terminal block on the right side in the isothermal
oven.
(7) Remove the four screws to remove the heater cover.
IMPORTANT
• Do not touch the end of two temperature sensors.
• Do not bend the wiring to the heater.
(8) Remove the two nuts mounting the end terminals on both ends of the heater. Then, pull out
the heater from the heater guide while removing two temperature sensors.
IMPORTANT
When securing and removing the nuts, do not apply any load to the ceramic plate on which the
terminals of the heater are fi xed.
(9) Pull both ends of the new heater and stretch it to about 500 mm long. Ensure that the heater
is stretched evenly (see Figure 6.26).
(10) Confi rm that the heater is not sagging and is stretched evenly.
(11) Reinstall the heater cover with the four screws. Confi rm the temperature sensors are in
place.
(12) Reconnect the wiring which has been disconnected in step (5) to the terminal block.
(13) Close the door of the isothermal oven.
<Replacement Parts>
Supply voltage
K9409GN 100 V AC (for isothermal oven temperature of over 110°C)
K9409GE 100 V AC (for isothermal oven temperature of 110°C or below)
K9409GP 110 V AC (for isothermal oven temperature of over 110°C)
K9409GF 110 V AC (for isothermal oven temperature of 110°C or below)
K9409GB 115 V AC (for isothermal oven temperature of over 110°C)
K9409GG 115 V AC (for isothermal oven temperature of 110°C or below)
2nd Edition : May 11, 2012-00