Installation Of Flanges - Siemens LDS 6 Operating Instructions Manual

In situ laser gas analyzers

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Table of Contents

Preparations for installation

3.1 Flanges

3.1.2

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.

Figure 3-2

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 optics housings

is more restricted when long purging tubes are used.

Optics housing cd 6