Siemens SITRANS SL - Installation of Process Flanges

Installing
4.2 Mounting
SITRANS SL
Operating Instructions, 12/2010, A5E01132948-04
43
4.2.3 Installation of process flanges
Preparation
The amount to which the axis can be adjusted is ± 1° which means that the process flanges
must be welded on the process wall to each other with this accuracy or better - see the
following figure.
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① Process wall
② Process flange
Figure 4-3 Flange alignment
To be able to set the correct path length in SITRANS SL the dimension A in the 'Flange
alignment' figure has to be measured after the flanges are mounted. The total length of the
purging tube (dimension B), including the process flange must also be known.
The path length can now be calculated as A - 2B.
CAUTION
Failure to weld the process flanges within ±1° of the symmetry axis of the flange pair will
result in the impossibility to align the sensor pair.