16 GM32 · Technical information · 8011923 · V 1.4 · © SICK AG
Product Description (Details)
Subject to change without notice
2.6 Contamination compensation
During the reference cycle, the zero point reflector serves to compensate contamination
occurring in the SR-unit. Contamination of the front window or measurement reflector
cannot be compensated in this manner. Light absorption also occurs during measuring
operation through dust in the flue gas. Both of these effects cannot be determined sepa-
rately due to the principle used and are compensated together using a basic line correction
during spectrum evaluation (
p. 11, §2.2).
2.6.1 Monitoring contamination
As described above, contamination outside the SR-unit cannot be differentiated from dust
effects. However, both effects are monitored together by continuous control of the maxi-
mum absorption measured in the spectral range of the evaluation. A maintenance request
is signaled when this absorption rises above a warning value that can be set as a parame-
ter (standard: absorption 1.8). Failure is signaled when a limit value is exceeded (standard
absorption 2.0).
2.7 Automatic adjustment with alignment
Swivel movements of the reflector relative to the SR-unit can occur during measuring oper-
ation. This can be caused, for example, when the probe bends due to varying gas tempera-
tures. These swivel movements are compensated continually on the GM32 by the built-in
tracking mirror. Motors tilt this mirror in two directions and can thereby compensate
occurring swivel movements.
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