multi EA 5100
Sulfur analysis with the S module 5100 (basic, MPO)
67
9
Sulfur analysis with the S module 5100 (basic, MPO)
9.1
Function and design
9.1.1
Function and measuring principle
Expansion of the basic module with the detection module allows determination of the
sulfur content in solid, liquid, paste-like, viscous and gaseous samples via UV floures-
cence.
The measuring gas is created during incineration of organic sulfur compounds in the ba-
sic module. It contains sulfur dioxide (SO
2
).
R-S + O
2
→ SO
2
+ CO
2
+ H
2
O
R: Hydrocarbon residue
The detection is performed using the UV fluorescence method. Sulfur dioxide (SO
2
) ex-
cited via UV light emits a characteristic flourescence (220 to 420 nm). This flourescence
is measured. The SO
2
concentration is determined from the changes to the flourescent
intensity.
9.1.2
Design
The detection module allows determinations of the sulfur content via UV flourescence.
All components required for determination are mounted inside the sealed housing.
Figure 43Basic module with detection module and sampling module
This analysis gas containing SO
2
is excited to flourescence via the radiation of a UV lamp.
The intensity of the fluorescence is determined with a photomultiplier (PMT).
To determine the sulfur content without interference from simultaneous increased ni-
trogen content the patented MPO (microplasma optimization) technology has been de-
veloped. The MPO technology removes the interfering nitrogen monoxide from the
measuring gas. This important, for example, during analysis of diesel fuels containing
cetane improvers.
