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Chapter 4
Plumbing the Gas Supply to the GC
Use the following procedure to attach traps to your gas line:
1. Determine the location for the trap in your supply line. Figure 4-2 shows the
2. Use a tubing cutter to cut the tubing to the desired length.
3. Turn the gas regulator supply handle counterclockwise to reduce line
4. Turn the gas supply off.
5. Use a 1/8" Swagelok fitting to connect the trap inlet to the gas supply tubing
6. Turn the gas supply on to 35 kPa (5 psi) for about 30 seconds.
7. Turn the gas supply off.
8. Connect tubing to the trap outlet with a 1/8" Swagelok fitting.
Follow this procedure for all traps you wish to add to your gas supply line.
Purging Gas Lines
You must purge the lines any time you make a cut in the tubing during the gas line
assembly process. This will clear them of any debris from the cut. You will also
need to purge the completely assembled gas lines, including any traps you plan to
use, before you connect the your gas supply to the FOCUS GC.
Use the following procedure to purge the gas lines:
1. Turn the gas supply on, and set the pressure to 35 kPa (5 psi).
2. Allow the line to purge for 10 minutes.
3. Turn off the gas supply.
58
recommended trap order.
pressure, then turn the gas supply on and increase the pressure to 35 kPa
(5 psi) for about 15 seconds to purge the line of any unwanted debris.
coming from the tank.
Purging Gas Lines
Site Preparation and Installation Manual
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