10 MCS300P · Technical Information · 8013265 V1-2 · © SICK AG
Product Description
Subject to change without notice
2.1 Functional principle
MCS300P is a non-dispersive process photometer.
Fig. 1 Beam path
● Depending on the device type, the radiation source used is an IR or VIS radiator.
● The measuring beam goes through the sample cell and is specifically absorbed
depending on the sample gas composition.
● Interference and gas filters swiveled into the beam path on filter wheels select the
measurement wavelength.
● The detector receives the successive measurement and reference radiation.
– With the measuring filter swiveled in, the signal depends on the sample gas compo-
sition.
– With the reference filter swiveled in, a concentration-independent signal is gener-
ated.
By computation of both signals, the MCS300P determines the measured variable
"absorption” which is then, to a wide extent, independent from the changes of the opti-
cal characteristics of the photometer.
After correction of possible disturbance variables, the determined absorption is con-
verted to the concentration value via the linearization function.
● As an option, a filter wheel with an internal adjustment standard is available which sim-
ulates a test with a test medium.
Source Chopper Cell Filter wheels with
measuring filters
Detector
Filter wheel with
adjustment standard
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