Siemens SIPROCESS UV600 Manual page 21

Operating principle
The measuring principle of the SIPROCESS UV600 is based on the molecule-specific
absorption of gases in the ultraviolet wavelength range. Radiation of a wavelength
appropriate to the measurement is passed through the sample, and the selective absorption
is determined which is proportional to the concentration of the measured component.
Measuring method
An electrodeless discharge lamp (1) emits broadband in the ultraviolet spectral range. A filter
wheel unit (2) generates the ultraviolet radiation suitable for the respective measured
component. Interference filter correlation (IFC) or gas filter correlation (GFC), or also a
combination of the two methods, can be used for this purpose.
Interference filter correlation (IFC)
The sample and reference radiations are generated alternately in that two different
interference filters are swung into the beam path (filter wheel 2a)
Gas filter correlation (GFC)
Especially for NO as the measured component, the reference radiation is generated by
swinging in a gas filter which is filled with the associated gas (filter wheel 2b)
IFC + GFC
The two filter wheels are combined in order to measure NO in combination with other
components.
SIPROCESS UV600
Operating Instructions, 10/2013, A5E03529375-02
Description
3.6 Operating principle
21