Agilent Technologies 6890 Series Service Manual page 193

Gas chromatograph

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Solvent Vapor Exit Accessory

Leak testing

Replace the septum of the Cool On-column inlet.

Using a 1/16-inch (SS) union and the appropriate graphite/Vespel

ferrules, connect the detector end (250 µm) of the tri-column assembly

and the transfer line (320 µm) together.

From the 6890 GC keyboard, set the inlet pressure to 50 psi and wait

approximately 15 seconds for equilibration.

If pressure can not be reached, either a very large leak is present or the supply

pressure is not high enough (at least 10 psi greater than desired pressure).

Cap the septum purge vent of the Cool On-column flow module using a

solid (no- hole) 1/8-inch Vespel ferrule (part no. 0100-1372) and a 1/8-

inch Swagelok nut (part no. 5180-4103). As an alternative a 1/8-inch

Swagelok cap can be used.

From the GC keyboard, turn the inlet pressure "OFF".

Note the "Actual" reading on the display and monitor for 10 minutes. You

can use the stopwatch feature of the 6890 GC to monitor the time by

pressing [Time] and then [Enter] to start timing.

If there is less than 1.5 psi pressure loss, consider the system to be leak

If pressure loss is much greater than 1.5 psi, there is a leak that must be

found and corrected.

Agilent 6890 Gas Chromatograph Service Manual

Troubleshooting

6890a 6890 plus