104 Advanced User Guide
5 Detectors
The phosphorus filter is yellow/green and transmits at
525 nanometers.
Inlet liners for use with the FPD
Compounds containing sulfur may adsorb on an inlet liner and
degrade the GC’s performance. Use deactivated, clean liners or
a cool on-column inlet, which injects directly onto the column.
For best results with splitless injection, use liner 5181-3316.
FPD temperature considerations
The minimum detector temperature to prevent water
condensation is 120 °C. We recommend a temperature that is
25 °C higher than the highest column temperature, but no
higher than 250 °C.
FPD gas purity
High-purity gases have a lower sulfur content. Standard purity
gases have a higher sulfur content which impairs sulfur
detection in the compound being studied. Instrument or
Chromatographic grades work well.
Agilent recommends using helium carrier, nitrogen makeup gas,
and air with 99.9995% purity or better. Use carbon, oxygen, and
moisture traps. Select traps to remove sulfur compounds from
detector air and nitrogen gases. A helium getter is also
recommended. See the GC, GC/MS, and ALS Site Preparation
Guide for and the Agilent web site at http://www.agilent.com
more information.
FPD gas flows
Table 20 gives the flows for the maximum sensitivity FPD flame,
which is hydrogen-rich and oxygen-poor.
Table 21 Recommended flows
Sulfur mode flows,
mL/min
Phosphorus mode
flows, mL/min
Carrier (hydrogen, helium, nitrogen, argon)
Packed columns 10 to 60 10 to 60
Capillary columns 1 to 5 1 to 5
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