Installation Guidelines
3.6 Installation of Flanges
LDS 6
Operating Instructions, 01/2009, A5E00295894-05
39
Flange Alignment Deviation
When both flange-tubes are permanently fixed the deviation from the theoretical optical path
must not exceed ±2°. This is because the alignment flanges can be adjusted maximum ±2°.
See the figure below.
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2
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Figure 3-8
Customer flange alignment
The required precision of the flange alignment
The aim should always be to achieve the best possible alignment of the flanges, i.e. to get
the center of the dot as close as possible to the center of the crosshair on the alignment tool.
This will allow for small changes, for example caused by thermal movement later on.
For a normal installation using standard 400 mm purging tubes the alignment is usually good
enough if the center of the dot is within 3 mm from the center. The lines closest to the center
of the crosshair are about 3 mm from the center.
Note
If long purging tubes will be used, a greater effort should be made to align the flanges
perfectly. Depending on the diameter and length of the stubs the possibility to align the
sensors is more restricted when long purging tubes are used.