Troubleshooting Tasks 8
Troubleshooting 87
To Measure a Split Vent or Septum Purge Flow
Septum purge and split vent flows exit through the pneumatic
module at the top rear of the GC. See the figure below.
To measure split vent or septum purge flows, attach the
flowmeter to the appropriate tube. Remove the GC pneumatics
cover to access the back inlet exhausts.
• The vents use a 1/8-in Swagelok threaded fitting. Create and
use a 1/8-in tube adapter (as shown below) to convert the
1/8-in threaded fitting into a 1/8-in tube. This prevents the
rubber flowmeter tubing from leaking around the threads,
which will result in leakage and thus an incorrect flow
reading.
WARNING
Hydrogen (H
2
) is flammable and is an explosion hazard when
mixed with air in an enclosed space (for example, a flow meter).
Purge flowmeters with inert gas as needed. Always measure
gases individually. Always turn off detectors to prevent
flame/bead autoignition.
Back inlet split vent
Back inlet septum purge
vent
Front inlet split vent
Front inlet septum purge
vent
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