Agilent Technologies 7890A Troubleshooting Manual page 96

8
Troubleshooting Tasks
To Measure a Split Vent or Septum Purge Flow
WA R N I N G
Back inlet split
vent
Front inlet split
vent
96
Hydrogen (H ) is flammable and is an explosion hazard when
2
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.
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.
Back inlet purge
vent
Front inlet
purge vent
Troubleshooting