170 Agilent 7890 Series Troubleshooting
7 Checking for Leaks
To Prepare the VI for a Closed System Leak Check
To leak check the interface independently of the gas sampling
device, you must disconnect the sampler from the interface to
isolate the interface flow system from the sampler.
1 Gather the following:
• 1/16-inch nut for transfer line
• Ferrule for transfer line
• Heat-resistant gloves (if the inlet is hot)
2 Disconnect the transfer line from the interface.
3 Disconnect the carrier line from the sampler.
4 Prepare the end of the carrier line using a 1/16-inch male nut
and ferrule.
5 Connect the carrier line to the interface where you removed
the transfer line and tighten the nut finger tight. Tighten an
additional 1/4 to 1/2 turn with the 1/4-inch wrench.
6 Return to “To Perform a VI Pressure Decay Test” and repeat
steps 9 to 16.
Be careful! The oven and/or inlet may be hot enough to cause
burns. If either is hot, wear heat-resistant gloves to protect your
hands.
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