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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.
Released: April 2004
2. Cap the septum purge fitting with a 1/8-inch
3. Leave the customer's column configuration
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
8. Set the inlet pressure to OFF.
9. Monitor the actual inlet pressure for a drop
6850 Series Gas Chromatograph Service Procedures
Swagelok cap (part number 5180-4124).
dimensions from his method.
equilibrate for about 5 minutes.
over time. It should drop < 0.5 psi for every
10 minutes.
290
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