Agilent Technologies 5975T LTM GC/MSD, Troubleshooting And Maintenance Manual

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100 Troubleshooting and Maintenance Guide
8
Checking for Leaks
Leak Check Tips
When checking for leaks, consider the system in two parts:
external leak points and instrument leak points.
• External leak points include the gas cylinder (or gas
purifier), regulator and its fittings, supply shutoff valves,
and connections to the GC supply fittings.
• Instrument leak points include inlets, LTM column
connections, GC/MSD transfer line connection, and
connections between flow modules and inlets.
1 Gather the following:
• Electronic leak detector capable of detecting the gas type
• 7/16-in, 9/16-in, and 1/4-in wrenches for tightening
Swagelok and column fittings
2
Check any potential leak points associated with any
maintenance recently performed.
3 Check instrument capillary fittings and connections that
undergo thermal cycling, since thermal cycling tends to
loosen some fitting types. Use the electronic leak detector to
determine if a fitting is leaking.
• Start by checking any newly made connections first.
• Remember to check connections in the gas supply lines
after changing traps or supply cylinders.
WA R N I N G
Hydrogen (H
2
) is flammable and is an explosion hazard when
mixed with air in an enclosed space (for example, a flow meter).
Purge flowmeters with inert gas as needed. Always measure
gases individually.
WA R N I N G
Hazardous sample gases may be present.