Flame Photometric Detector (Fpd) Theory Of Operation; Single Wavelength Fpd - Agilent Technologies 6890 Series Service Manual

350 Flame Photometric Detector (FPD)
Theory of operation
Air
H
2
Makeup
Figure 350-1

Single wavelength FPD

The single wavelength FPD is a single burner module with one PMT housing.
Either sulfur or phosphorus can be detected by installing an appropriate
optical filter in the PMT housing.
The sulfur filter is blue/purple and transmits at 393 nanometers.
The phosphorus filter is yellow/green and transmits at 525 nanometers.
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Pressure
Filter
sensors
frits
Proportional
Restrictors
valves
PS
Shield
PS
PS
Pressure
control loops
Schematic of a flame photometric detector
Detectors
Agilent 6890 Gas Chromatograph Service Manual
Vent
Emission zone
PMT
Wavelength filter
Window
Jun 2001