154 Agilent 7890 Series Troubleshooting
7 Checking for Leaks
19
Quickly turn off the carrier gas supply at its source, if
possible. The goal is to prevent any residual pressure from
the supply lines from leaking into the closed system and
causing a pressure rise and masking leaks. (Such leaks in
through the EPC module typically do not impact runs.) If the
setup does not include shutoff valves at the GC, or if
changing the source pressure is not practical, skip this step.
If there is a relatively large volume in the supply tubing
leading up to the GC, consider whether or not there could
have been a leak into the system when evaluating the test
results.
20 Monitor the pressure for 10 minutes. Use the timer by
pressing [Time] and [Enter].
A pressure drop of less than 0.7 psig (0.07 psi/min or less;
4.8 kPa or 0.48 kPa/min) is acceptable.
If the pressure drops much faster than the acceptable rate,
see “To Correct Leaks in the Packed Column Inlet”. Retest.
21 After the inlet passes the test, restore the GC to operating
condition.
• Remove any caps/plugs.
• Restore source pressures.
• Reinstall the column.
• Restore the correct column configuration.
• Load the operating method.
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