Yokogawa GC8000 Process Gas Chromatograph - Manual (Page 433)

<Appendix A Principle of Gas Chromatograph>
App.A-4
IM 11B08A01-01E
 FPD
Figure 5 shows the structure of the FPD. As the measured gas containing a sulfur component is
led into the excess hydrogen flame, the component containing the sulfur atoms is excited. The
FPD detects the luminous intensity of the light emitted when this excited component returns to its
base state using a multiplier phototube and converts it to a voltage.
This voltage represents the concentration of the sulfur component in the measured gas.
The FPD can measure the sulfur component with a high sensitivity of 0.2 ppm.
F_A05.ai
Photomultiplier tube
Hydrogen flame
Jet pipe (nozzle)
Carrier gas
+
Sampling gas
Air fo combustion
Hydrogen gas for combustion Hydrogen gas
for combustion
Figure 5 Basic Confi guration of Flame Photometric Detector
2nd Edition : May 11, 2012-00