Agilent Technologies 6890 Series, Service Manual, Page: 103 / 867

230 Cool On-Column Inlet
Leak testing EPC and manual inlets
14 of 20
Jun 2001
Inlets
Agilent 6890 Gas Chromatograph Service Manual
Performing the leak test—manual inlets
Note Be sure that the preparation steps on pages 10 and 11 are complete before
proceeding with this test.
1. Turn the pressure controller clockwise until the column head pressure
reaches 25 psi.
2. Wait 10 minutes for pressure equilibration. The gauge on the front panel
should be stable.
3. After 10 minutes, shut off the column head pressure by turning the
pressure controller full counter-clockwise.
Figure 230-9 Inlet manifold
4. Monitor the pressure gauge for 5 minutes.
• If there is less than 0.5 psi pressure loss (approximately 0.1 psi/
min.), consider the system leak tight.
• If pressure loss is much greater than 0.5 psi, there is a leak that must
be found and corrected. See Correcting leaks later in this section.
5. When the system is considered leak tight, the caps may be removed, the
column reinstalled, and the desired pressure set.
Pressure gauge
Pressure regulator
ON-COL