Emerson Rosemount 700XA Reference Manual page 17

Reference Manual
2-3-9000-744
Figure 1-4: Analyzer assembly with FID detector bridge
A. Polarizing voltage
B. Electrometer
C. Signal out
D. Sample/hydrogen (H
E. Air
1.4.3 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 , and all the necessary
electronics to digitize the signal. The digital signal is then transmitted to the main central
processing unit (CPU) using CAN bus.
Rosemount 700XA
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Overview
June 2022
17