Leak Check General Procedure - Agilent Technologies 7697A Troubleshooting Manual

4
Leaks

Leak Check General Procedure

WA R N I N G
WA R N I N G
34
When checking for leaks, consider the system in three parts:
external leak points, GC leak points, and HS leak points.
• External leak points include the gas cylinder (or gas
purifier), the regulator and its fittings, the supply shutoff
valves, and the connections to the HS and GC supply
fittings.
• For GC leak points, refer to the GC user documentation.
• HS leak points include the connections at the six port
valve (sample loop and transfer line), the transfer line
connection to the GC inlet, and the connections for the
sampling probe.
Hydrogen (H2) is flammable and is an explosion hazard when
mixed with air in an enclosed space (for example, a flow meter).
Purge flow meters with inert gas as needed. Always measure
gases individually.
Hazardous sample may be present.
Gather the following:
1
• Electronic leak detector capable of detecting the gas
type (Agilent part number G3388A).
• 7/16- inch, 9/16- inch, and 1/4- inch wrenches for
tightening Swagelok and column fittings.
• Leak test kit, Agilent part number G4556- 67010.
Includes: no hole ferrule, 11 mm low bleed septa,
headspace (blue) leak test vial, 1/8- in. nylon tube
fitting plug, 1/16- in. stainless steel ZDV plug (six port
valve cap).
2 Check any potential leak points associated with any
recent maintenance.
Check for external leaks. See
3
Leaks".
4 Check the GC for leaks. See the GC user documentation.
"Checking for External
Agilent 7697A Troubleshooting