Multiple Systems; Leak Test The Lines From The Gas Source To The Gc - Thermo Scientific TRACE GC Ultra Maintenance And Troubleshooting Manual

Chapter 10
Ensuring Tightness
OPERATING SEQUENCE

Leak Test the Lines from the Gas Source to the GC

1. Switch off the gas chromatograph power supply.
2. Turn on all gas supply lines to the GC, setting the input pressure to 420 kPa
3. Turn off the input gas source. The pressure value should not change more than
4. Check the connections with the Thermo Scientific GLD Pro leak detector, or

Multiple systems

If more than a system is attached to the same gas source, you will need to isolate
each GC system.
1. Install a cut-off valve and pressure gauge with an 1/8 inch input tee in the gas
2. Turn on the gas supply and allow the system to pressurize.
3. Turn off the input gas source. The pressure value should not change more than
4. Check the connections of the line you are testing with the leak detector to find
188
(60 psi). Allow the gas lines to pressurize for several seconds.
5% in 10 minutes. If the value drops down immediately, one or more leaks are
present. In this case:
equivalent handheld electronic leak detector, to find possible leaks.
line leading to the GC that you are leak testing, as shown in Figure 10-3. Be
sure the pressure gauge is connected in line between the on/off valve and the
GC.
5% in 10 minutes. If the value drops down immediately, one or more leaks are
present in the plumbing from the cut-off valve to the GC. In this case:
the leaks.
Leak Test the Lines from the Gas Source to the GC
Maintenance and Troubleshooting Manual