Agilent Technologies 7890A Troubleshooting

76 Agilent 7890 Series Troubleshooting
3 Chromatographic Symptoms
FPD Output Too High or Too Low
• Verify that the correct filter is being used. Do not use a
phosphorus filter with sulfur-optimized flows or a sulfur
filter with phosphorus-optimized flows.
• Check the position of the column as installed in the detector.
• Check the gas purity.
• Verify that the flows are optimized for the filter being used.
Monitor the FPD output. The table below provides examples
of detector output when the filter installed in the detector
and the gas flows in use do not match.
Besides having a mismatch between the filter installed and a
particular set of gas flows, check the FPD signal output with the
flame lit:
• If the output is 0.5 to 3.0, check that the flame is ON.
• If the output is 0, check if the electrometer is turned OFF or
the signal cable is disconnected.
• If the output < 30, the flame may be in the wrong position.
Check detector flows, column flow, and column position. See
the following:
• To Measure a Column Flow
• To Measure a Detector Flow
Outputs
Gas flows optimized
for
With sulfur filter With phosphorus filter
Sulfur 30 to 50 10 to 12 (low)
Phosphorus 240 to 250 (high) 30 to 50

Agilent Technologies 7890A Specifications

General

Brand	Agilent Technologies
Model	7890A
Category	Laboratory Equipment
Language	English