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5. Force the instrument into "Prep Run" by hit-
ting the Prep Run key twice. The inlet pneu-
matic configuration will change to that
depicted below:
Carrier supply
total flow in
100 psi
input pressure
Proportional
valve 1
Reduced flow
Full flow -
split flow path
Released: April 2004
Forward pressure control loop
Flow sensor
6 mL/min
Total flow
control loop
Gold seal
6850 Series Gas Chromatograph Service Procedures
20 psi
Pressure sensor
Split vent trap
Purge valve
closed
Column flow: 2 mL/min
Septum purge
regulator
fixed @ 3 mL/min
Split vent
0 mL/min
Proportional
valve 2
287
S
v
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