Siemens SITRANS LG270 Operating Instructions Manual page 21

Mounting in the vessel
insulation
Fasten
PBD-51041506
Instruments for a temperature range up to +250 °C (482 °F) have a
spacer between process fitting and electronics housing. This spacer
is used to thermally decouple the electronics from the high process
temperatures.
Information:
The spacer may be incorporated in the vessel insulation up to max.
50 mm (2 in). Only then is a reliable temperature decoupling guaran-
teed.
Fig. 11: Mounting the instrument on insulated vessels.
1 Temperature insulation
2 Ambient temperature on the housing
If there is a risk of the cable probe touching the vessel wall during
operation due to product movements or agitators, etc., the measuring
probe should be securely fixed.
There is an internal thread (M8) in the gravity weight, e.g. for an eye-
bolt (optional).
Make sure that the probe cable is not completely taut. Avoid tensile
loads on the cable.
Avoid undefined vessel connections, i.e. the connection must be
either grounded reliably or isolated reliably. Any undefined change of
this condition can lead to measurement errors.
If there is a danger of the rod probe touching the vessel wall, fasten
the probe at the bottom end.
Keep in mind that measurement is not possible below the fastening
point.
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