290 AO2000 CONTINUOUS GAS ANALYZERS | OI/AO2000-EN REV. B
Uras26: Phase alignment
Definition
Sample / reference signal phasing is optimized in the Uras26 by performing
a phase alignment.
When should phase alignment be performed?
A phase alignment must always be performed after optical alignment (see
page 287) when the emitter is replaced.
How should phase alignment be performed?
A separate phase alignment must be performed for each detector (= sample
component) in an analyzer module.
The phase alignment is performed electronically and there is no need to
open the system housing.
Test gases
During the phase alignment zero and span gas supply should be turned on
successively for each sample component.
If the analyzer module is equipped with calibration units the calibration cells
are automatically inserted in the beam path for span alignment. Meanwhile
zero gas must remain turned on.
Menu path
MENU → Maintenance/Test → Analyzer spec. adjustm. →
Phase adjustm
Phase alignment procedure
1 Select the Phase adjustm. menu item.
2 Select the Sample component.
3 Turn on the zero gas supply.
4 Wait until the measurement value reading stabilizes and activate the
alignment procedure.
5 If the analyzer module is equipped with calibration cells, then let the
zero gas be turned on.
If the analyzer module has no calibration cells, turn on the span gas sup-
ply.
6 Wait until the measurement value reading stabilizes and activate the
alignment procedure.
7 Repeat steps 2 to 6 for all sample components.
8 Calibrate the zero and end points for all sample components in the ana-
lyzer module (basic calibration).
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