Inlets and valves
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 126
• The knurled nut
• The septum purge cap (septum head only)
• The connections for the carrier gas and sep-
tum purge (septum head only)
• The lower inlet seal at the bottom of the
inlet
• The inlet bottom cap
Valves
Replacing the Valve Box
The valve box sits on top of the 6850 GC and
contains the valves and plumbing, heated zones
and sensors, and the insulation.
1. Place the main power switch in the off posi-
tion.
WARNING
Hazardous voltages are present in the instru-
ment when the power cord is connected.
Avoid a potentially dangerous shock hazard
by disconnecting the power cord before
working on the instrument.
2. Unplug the line power cord from its
receptacle.
3. Allow some time for the oven and heated
zones to cool.
4. When the oven has cooled, turn off all gas
supplies.
5. Switch the solenoid valve off so the actuator
is in its fully extended position (piston rod
extended as shown).
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