Troubleshooting Tasks 8
Troubleshooting 89
To Measure a Detector Flow
Measuring FID, TCD, uECD, and FPD flows
1 Gather the following:
• Appropriate flowmeter adapter tube (can be found in the
GC ship kit)
• Electronic flowmeter calibrated for the gas and flow rates
of concern
2 Set the oven temperature to ambient (35 °C).
3 Turn off the column flow and pressure.
4 Turn off (where applicable): the FID flame, FPD flame, and
TCD filament.
5 Cool the detector.
6 Connect the appropriate adapter to the detector exhaust.
A rubber adapter tube attaches directly to a uECD, or TCD
exhaust vent.
A separate adapter is supplied for the FID. 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.
For FPD, remove the vent tube assembly and use a 1/4-inch
tube adapter between the detector exhaust and the
flowmeter tubing.
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.
CAUTION
To avoid damaging the column, cool the oven before turning off the
column flow.
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