Emerson Rosemount 700XA Reference Manual page 10

Figure 4: Analyzer Assembly with FID Detector Bridge
A. Polarizing voltage
B. Electrometer
C. Signal out
D. Sample/hydrogen (H
2
E. Air
Micro flame photometric detector (µFPD) burner
The flame photometric detector (FPD) is a very sensitive and selective detector for the analysis of sulfur or organophosphorus
containing compounds. The detector is very stable and easy to use.
As the analyte is burned in a hydrogen and air flame, a characteristic wavelength of light is emitted at 394 nm for sulfur. The
emitted light is amplified by the photomultiplier tube (PMT) and processed by the signal processor. The response to phosphorus is
linear and quadratic to sulfur.
The Emerson µFPD solution consists of three key parts: burner, fiber cable, and PMT electronics. The hydrogen and air in the burner
help to burn the sample containing sulfur components. The light emitted from the chemical reaction is then transmitted using the
fiber cable from the oven assembly to the electronics module. The PMT electronics module consists of a 394 nm filter, a
photomultiplier tube (PMT), and all the necessary electronics to digitize the signal. The digtial signal is then transmitted to the main
central processing unit (CPU) using CAN bus.
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July 2020
Emerson.com/Rosemount