Dual Wavelength for both Sulfur and Phosphorus

  • Bandpass Filters for Sulfur or Phosphorus
  • Use the Dual FPD for Simultaneous Sulfur and Phosphorus Detection
  • Detects Sulfur Compounds to 200ppb, Phosphorus Compounds down to 10ppb
  • Use the FPD/FID or Dual FPD/FID for Simultaneous Hydrocarbon Speciation


Combination FPD and FID Detector
The Flame Photometric Detector can detect sulfur compounds, such as H2S or SO2, down to about 200ppb and phosphorus compounds to 10ppb. While not 100% selective, the FPD is 100,000 times more sensitive to sulfur and phosphorus compounds than hydrocarbons. The phosphorus response is linear, and the sulfur response is exponential (twice the sulfur yields four times the peak area).
The FPD is similar to the FID except that the detector body is lighttight 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 and 525nm for phosphorus) mounts in front of the PMT, so only the emissions from sulfur or phosphorus are detected while other wavelengths are rejected.
Combination FPD and FID Detector
The Dual FPD detector is equipped with two PMTs and filters for the simultaneous detection of sulfur and phosphorus.
Combination FPD and FID Detector
Product number:
8690-0080
FPD detector
8690-1080 FPD/FID combination detector
8690-0085 Dual FPD with sulfur and phosphorus filters
8690-2085 Dual FPD with sulfur and phosphorus filters, and FID collector electrode