142 Agilent 7890 Series Troubleshooting
7 Checking for Leaks
For a GC with a G1888 Headspace Sampler:
A pressure drop of less than 2 psig in 5 minutes (0.4 psi/min
or less; 13.8 kPa or 2.76 kPa/min) is acceptable when using a
1 cc sample loop.
For all GCs:
Note that liner size impacts pressure drop. An inlet with a
smaller volume liner does not tolerate as large a leak rate as
an inlet with a larger volume liner.
21 After the inlet passes the test, restore the GC to operating
condition.
• Restore source pressures.
• Remove any caps/plugs.
• Reinstall the column.
• Restore the correct column configuration.
• Load the operating method.
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