Carrier Flow Path Pressurization Test - Agilent Technologies G1289 Operating Manual

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Caution
Do not tighten Swagelok fittings more than approximately 1/4-turn. If needed,
remake the connection.

Carrier Flow Path Pressurization Test

This test is an alternate to the test described above.
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Observe the column flow rate from the GC front panel. The flow rate
should be close to the nominal, approximately 4 ml/min.
The inlet Total Flow at the GC front panel should read the sum of the
purge flow (200 ml/min) + the column flow (4 ml/min) + the septum purge
flow (3 ml/min), or approximately 207 ml/min.
Press the Prep Run key on the 6890. (If another temperature or flow is not
ready, you may need to press Prep Run twice.)
The capillary inlet purge valve shuts off and the inlet switches to forward
pressure control. The inlet EPC module flow sensor becomes read-only.
Check the total flow reading for the inlet. Now that the purge flow is
turned off, the total flow should drop to the column flow (4 ml/min) + the
septum purge flow (3 ml/min), or approximately 7 ml/min. If the flow rate
is much higher, there is a leak in the carrier gas flow path between the
6890 inlet flow module and the detector column fitting. Continue with the
next step to get more information.
On the headspace sampler, press Adv Fctn, 5, Enter, and scroll to
Sample Valve. Turn it on using keys 0 and 1. Observe the total flow rate. If
the flow rate changes when the sample loop is taken out of the flow path,
then one (or both) of the fittings on the sample loop is leaking. Tighten any
leaking fitting.
If the total flow rate indicates a leak, check each connection in the path
and tighten if necessary.
Set the three heated zones to ambient temperature.
De-configure the GC column assigned to the inlet used with the headspace
sampler.
Cap the column fitting with a "no-hole" ferrule (part no. 5181-7458).
Cap the inlet's septum purge fitting with a 1/8-inch Swagelok cap.
Maintaining the Instrument
Leak Testing a G1289 to 6890 GC Interface
107