Agilent Technologies 7890A Troubleshooting Manual page 92

8
Troubleshooting Tasks
To Measure a Column Flow
Measuring FID, TCD, uECD, and FPD column flow
WA R N I N G
WA R N I N G
N O T E
92
The following procedure can be used to measure column
flow with an FID, TCD, uECD, and FPD.
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.
Be careful! The detector may be hot enough to cause burns. If the
detector is hot, wear heat-resistant gloves to protect your hands.
Gather the following:
1
• Appropriate flowmeter adapter tube (can be found in
the GC ship kit)
• Electronic flowmeter calibrated for the gas and flow
rates of concern
Turn off the detector.
2
Turn off the detector flows.
3
Connect the appropriate adapter to the detector exhaust.
4
Flowmeter tube diameters vary by model; modify the adapter to the
flowmeter tubing as needed.
A 1/8- in rubber adapter tube attaches directly to a uECD
or TCD exhaust vent.
A separate adapter (19301- 60660) 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.
Troubleshooting