Installation Of Flanges - Siemens LDS 6 Operating Instructions Manual

Figure 3-8
There are applications where furnace walls move due to variations in temperature. If the furnace
walls move the optics housings will be miss-aligned and the measurement interrupted. To
overcome this, the Optics Housing CD 6 can be fixed to a girder or other structure that is not
influenced by the temperature and the flexible metal tube is fitted between the process flange
and the optics housing flange. Remember that the flanges fitted for the optics housings must not
deviate more than ±2°.
Note
It is very important that the flanges are mounted so that they are aligned. Otherwise the
measurements will not be correct.
3.6

Installation of flanges

Make sure there is enough room for the Optics Housing CD 6. Especially take into consideration
that it should be easy to mount or dismount and that the optics housings lid should be able to
open fully. Safe working space around the optics housings are also needed, guardrails, ladders,
etc. The figure below illustrates the process for installation of flanges.
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.
LDS 6
Operating Instructions, 01/2022, A5E00295894-10
LDS 6, Optics Housing CD 6 mounted on a process flange
Installation guidelines
3.6 Installation of flanges
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