Quadrex Corp. - Capillary Columns, SRI Portable Gas Chromatographs (GC) -Detectors-Flame Photometric (FPD)

FLAME PHOTOMETRIC DETECTOR( FPD )
DUAL FPD, FPD/FID

The FPD detector is similar to the FID except that the detector body is completely light tight and a second flow of hydrogen purges the optical path between the photomultiplier tube ( PMT ) and the hydrogen-rich flame. A bandpass filter at 393nm. for sulfur or 525nm. for phosphorus mounts in front of the PMT so only the emissions from sulfur or phosphorus are detected while other wavelengths are rejected.

While not 100% selective, the FPD is 100,000 times more sensitive for S-P compounds than for hydrocarbons. Sulfur compounds such as H2S or SO2 can be detected down to about 200 ppb and phosphorus to 10ppb. The phosphorus response is linear, but the sulfur response is exponential ( twice the sulfur yields four times the peak area ).

The dual FPD detector is equipped with two PMTs which allow simultaneous detection of sulfur and phosphorus, and either the single or dual FPD can be equipped with an FID collector electrode and electrometer which will detect the hydrocarbon peaks at the same time as the PMTs are responding to the S-P compounds.

The FID response is not as sensitive as a pure FID because the hydrogen-rich flame required for optimum S-P detection is not optimum for best hydrocarbon response. Users can easily optimize S-P response versus hydrocarbons response by simply adjusting the hydrogen/air mixture using the included EPC gas controls.

#SRI-8690-0080	FPD detector with EPC gas controls specify sulfur (393nm) or phosphorus (525nm) filter	$3,995.00
#SRI-8690-0085	Dual FPD detector with EPC gas controls dual amplifiers, filters, and PMT tubes	$7,995.00
#SRI-8690-1080	Single FPD, as above, with FID probe and dual amplifiers	$4,995.00
#SRI-8690-2085	Dual FPD, as above, with FID probe and three amplifiers	$8,995.00