Testing For Leaks - Thermo Scientific FOCUS GC Site Preparation And Installation Manual

Chapter 4
Plumbing the Gas Supply to the GC

Testing for Leaks

Once you have connected the gas supply to the GC inlet you need to test the
supply lines for leaks. Turn on your gas supply and use the following information
to set the gas pressures for the leak test.
•
•
•
1. Use the handheld electronic leak detector compatible with the carrier gas in
2. If you detect a leak, tighten the connection and retest it.
3. Repeat this process until all Swagelok
WARNING! Do not use liquid soap leaks sensor for leaks. Liquid soap leaks sensor
contaminates your system.
A mixture of 50% H
leak detector. Never use liquid leak detectors on or around electronic pneumatic
circuits.
64
Set the carrier gas pressure to approximately 50 kPa (7 psi) higher than the
maximum pressure of the GC regulator.
Set the detector gas pressures to approximately 350 kPa (50 psi).
Next you need to check all Swagelok
procedure to check the fittings for leaks:
use to check each fitting for leaks.
O/50% methanol or isopropyl alcohol may be used as a liquid
2
fittings for leaks. Use the following
®
®
connections are leak free.
Site Preparation and Installation Manual
Testing for Leaks