9-6 Chapter 9: Inspection and Maintenance 42/24-10 EN Rev. 9
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 when the
emitter is replaced (see page 9-4).
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 a 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.
Step Action
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.
If Then
The analyzer module has no
calibration cells
Turn on the span gas supply.
5
The analyzer module is equipped with
calibration cells
Let the zero gas be turned on.
6 Wait until the measurement value reading stabilizes and activate the
alignment procedure.
7 Repeat steps 2-6 for all sample components.
Procedure
8 Calibrate the zero and span points for all sample components in the
analyzer module.
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