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Agilent Technologies 7890 Series - To Measure a Split Vent or Septum Purge Flow

Agilent Technologies 7890 Series
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178 Agilent 7890 Series Troubleshooting
8 Troubleshooting Tasks
To Measure a Split Vent or Septum Purge Flow
Note that the GC reports flows calibrated to 25 °C and
1 atmosphere. Correct flowmeter results accordingly.
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.
WARNING
Hydrogen (H2) 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.

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