Siemens SITRANS LG250 Operating Instructions Manual page 20

Fasten
Fixing facility
20
Keep in mind that the lower dead zone underneath the spacer in-
creases if spacers are used.
Buildup can form on the spacers. Strong buildup can influence the
measurement.
Note:
Measurement in a standpipe is not recommended for extremely
adhesive products. In case of slight buildup, you should choose a
standpipe with bigger diameter.
Instructions for the measurement:
•
The 100 % point with standpipes should be below the upper
ventilation hole.
•
The 0 % point in standpipes should be above the gravity or center-
ing weight.
•
A false signal suppression with installed sensor is generally rec-
ommended to achieve the best possible accuracy.
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.
1
2
Fig. 11: Fasten the probe
1 Measuring probe
2 Retaining sleeve
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 can be strained.
For this purpose there is an internal thread (M12 or M8) in the gravity
weight.
SITRANS LG250 - Operating Instructions
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2
PBD-51041053