Flame Photometric Detector
3
The Flame Photometric Detector
(FPD) is a selective detector that
can detect sulfur based on the in‐
tensity of light during combustion.
Two versions of the FPD have
been available for the Maxum II.
In 2007, enhancements were
made to the original FPD that im‐
proved the performance. The en‐
hanced FPD is called FPD II. Oth‐
er than their performance, the
original FPD and FPD II are very
similar.
The FPD is shown at right without
cover or insulation.
The FPD detects sulfur by combusting the sample components in a hydrogen rich flame. This
generates light of specific wavelengths. A filter passes light wavelengths which are
characteristic for sulfur. This is converted into an electrical signal using a photomultiplier device.
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Figure 3-1 FPD basic function
Components
The FPD comprises:
● Bottom part contains connections for combustion gas, combustion air, column and exhaust,
and a burner nozzle.
● Top part contains combustion chamber, glow plug and fiber optic interface.
Maxum Edition II Detectors
Service Manual, May 2018, A5E42019847001 17
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