AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B 287
Uras26: Optical alignment
Definition
Optical alignment of the Uras26 analyzer module will minimize the asym-
metry on the detector of the incident radiation through the sample and ref-
erence sides of the sample cell.
When should optical alignment be performed?
An optical alignment must always be performed
• If the offset drift has fallen below the permissible range (50 % of the
physical measuring range.
• After a component (emitter, sample cell, calibration unit/cell, detector)
is installed in or removed from a beam path.
How should optical alignment be performed?
Each beam path in the analyzer module must be optically aligned separately.
If there are two detectors in a beam path, the optical alignment should be
performed in the rearmost detector (as seen from the emitter). During an
optical alignment, beam path intensity is varied by means of mechanical
apertures and, if necessary, by turning the emitter case. For this, the system
housing must be opened.
Detector arrangement
11
2
1 1
2
1
3
1
42
Detector numbers correspond to the numbers assigned to the series of
measurement components as shown on the module identification plate.
Test gas
During optical alignment the zero gas supply must be turned on.
Emitter wrench
An "emitter wrench" is required to rotate the emitter case. It is affixed to the
analyzer module.
Menu path
MENU → Maintenance/Test → Analyzer spec. adjustm. →
Optical adjustm.
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