Detectors 5
Advanced User Guide 99
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.
Helium, either as carrier or makeup gas, may cool the detector
gases below the ignition temperature. We recommend using
nitrogen rather than helium.
Lighting the FPD
+
flame
Before trying to light the flame, heat the detector to operating
temperature and let it stabilize.
Table 20 Recommended flows
mL/min
Carrier (hydrogen, helium, nitrogen, argon)
Packed columns 10 to 60
Capillary columns 1 to 5
Detector gases
Hydrogen 60
Air 60
Carrier + makeup 60
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