Siemens SITRANS LG270 Operating Instructions Manual page 21

Lateral installation
Rod extension
Steam boiler applications
PBD-51041066
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Fig. 12: Fasten the probe
1 Measuring probe
2 Retaining sleeve
In case of difficult installation conditions, the probe can be also
mounted laterally. For this purpose, adapt the rod with rod extensions
or bow-shaped segments.
Let the probe length determine automatically by the instrument to
compensate the resulting running time changes.
The determine probe length can deviate from the actual probe length
when using bow-shaped segments.
If installations such as struts, ladders, etc. exist on the vessel wall,
then the probe should have a distance to the vessel wall of at least
300 mm (11.81 in).
You can find further information in the supplementary instructions of
the rod extension.
In case of difficult installation conditions, for example in a socket, the
probe can be adapted respectively with a rod extension.
Let the probe length determine automatically by the instrument to
compensate the resulting running time changes.
You can find further information in the supplementary instructions of
the rod extension.
Vapours, superimposed gases, high pressures and temperature dif-
ferences can change the spreading speed of radar impulses.
There are two possibilities to correct these deviations.
Corrective value in the process control system
In the technical data under "Influence of superimposed gas and pres-
sure on accuracy" you can find a table with deviation values in some
typical gases or in steam.
SITRANS LG270 - Operating Instructions
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