208 Advanced Operation Manual
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 53 gives the flows for the maximum sensitivity FPD
flame, which is hydrogen- rich and oxygen- poor.
Tabl e 54 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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