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Part 3. Measuring flow rates Flow and Pressure Control
Where to measure flows
Where to measure flows
EPC inlets—Septum purge and split vent flows exit through the pneumatic
module at the top rear of the GC.
EPC and nonEPC detectors—Measure all flows, including carrier, at the exit of
the detector. Use the control tables to select one gas at a time.
NonEPC inlets—The flow vents are on the front panel. See page 72.
Adapters for measuring flow rates
A rubber adapter tube attaches directly to an NPD, ECD, or TCD exhaust vent.
A separate adapter is supplied for the FID and similar detectors. Insert the
adapter into the detector exhaust vent as far as possible. You will feel resistance
as the adapter O-ring is forced into the detector exhaust vent. Twist and push
the adapter during insertion to ensure a good seal.
Split vent
Septum purge
Septum purge
Purged packed and cool
on-column pneumatic module
Split/splitless and PTV
pneumatic module
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