Troubleshooting
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 290
This is not an absolute test in that the flow
sensor is not accurate or stable at low flows
(< 20 mL/min).
Complete inlet pressure test
The second leak test confirms that are no leaks
in the inlet. Perform the complete inlet pressure
test as follows:
1. Remove the column and cap the column
fitting of the inlet. Use one of the following:
• No hole ferrule, part number 5181-7458
(part of the Leak Test Kit)
• No hole column nut with any ferrule
(part number 5020-8294)
• Short piece of column installed in the
inlet with a new septum inserted edge-
wise over the end of the column.
2. Cap the septum purge fitting with a 1/8-inch
Swagelok cap (part number 5180-4124).
3. Leave the customer's column configuration
dimensions from his method.
4. Put the inlet into split mode.
5. Set the inlet pressure to 25 psi.
6. Set the split flow to 100 mL/min.
7. Allow the inlet system to pressurize and
equilibrate for about 5 minutes.
8. Set the inlet pressure to OFF.
9. Monitor the actual inlet pressure for a drop
over time. It should drop < 0.5 psi for every
10 minutes.
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