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Edition 06/2009
Overloads may also occur in lifting direction when the force application is
permanently mounted to the load cell such as elastomer bearings on load cells of
series BB.
Lift off protection is necessary where there is a risk of the load carrier lifting off or
tipping over. This is essential for lightweight containers or high silos outdoors.
CAUTION
Overload protection devices must always be provided for load cells with low rated
loads to protect the cells from being damaged.
Use of the load cells beyond the maximum working load or maximum transverse
load can lead to irreparable faults and even breakage of the load cell.
Load cells may not be overloaded, e.g. by tightening screws, when adding
installation components.
NOTE
If load cells are loaded beyond their rated load this can lead to an error message
in the weighing module.
If load surges during the measuring mode cannot be ruled out, for example when
the load is set down in free fall, suitable precautions must be taken to avoid
damage to the load cell (e.g. elastomer bearings or higher load cells).
The load must be applied in exact measuring direction of the load cell. Torsion and
bending torques, off-center loads and transverse loads are disturbances which on
the one hand falsify the measuring result and on the other hand can damage the
load cell when they exceed the permissible limits. Load cells must therefore be
installed with suitable installation components (e.g. SIWAREX R installation
components). The possible errors mentioned above are then largely avoided. The
installation components allow enough freedom of movement to prevent heat
expansion leading to transverse loads.
Transverse forces such as are caused by wind, acceleration or conveyor belt
friction must be compensated by deflections or stops. Deflections must be installed
exactly vertical to the direction of action of the load cells so that no force
components occur in measuring direction. The deflections must be installed in such
a way that they do not twist for example when the application points expand. This
is most easily avoided by arranging the deflections in the same direction of
rotation.
The deflections to be installed should correspond to the principles used in weighing
technology. Ball-jointed deflections are available for most SIWAREX R combi-
installation units. Ball bolt deflectors up to a transverse load of 1000 kN are
available on request.
No parallel forces may be applied by filling and emptying devices and supply lines.
SIWAREX R Load Cells Operating Manual
A5E00159640
Technical Description
8
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