Inlets and valves
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 118
NOTE: Make sure that the carrier gas source
pressure is at least 35 psi. Carrier source pres-
sure should always be at least 10 psi greater
than the desired inlet pressure.
Performing the leak test
NOTE: Be sure to complete all of the preparation
steps on page 119 before continuing.
1. Set the inlet to “Split Mode.”
2. Configure the column as 0 length.
Press [Config] [Column 1] or
[Config] [Column 2] and enter
“0” in the first column of the “Dim” field.
3. Set the inlet’s Total Flow to 60 mL/min.
Press [Front Inlet] (or [Back
Inlet]) and enter “60” in the “Tot flow”
field.
4. Set the pressure to 25 psi.
Scroll to Pressure and enter “25” in the
“Pressure” field.
5. Wait approximately 15 seconds for equilibra-
tion.
If pressure cannot be achieved, either a very
large leak is present in the system, or the
supply pressure is not high enough.
6. Turn the inlet pressure “Off.”
Press [Front Inlet] (or [Back
Inlet]), scroll to the “Pressure” field,
and press [Off]. Both the flow controller
and the back pressure valves will close.
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