ABB PFTL301E 1.0 KN Mechanical stress sensor

Description

The measuring principle of the sensor is based on the Pressductor® technology and the fact that
the permeability of a magnetic material changes under mechanical stress.
The transducer is made up of a stack of specially treated laminates, forming the measuring body.
Primary and secondary windings are wound through four holes in the sensor so that they cross at
right angles.
The primary winding is supplied with an alternating current which creates a magnetic fieKd around
the primary winding. Since the two windings are at right angles to each other, there will be no magnetic fieKd around the secondary winding, as long as there is no load on the sensor.

When the sensor is subjected to a mechanical force in the direction of measurement, the propagation of the magnetic fieKd changes so that it surrounds the secondary winding, inducing an alternating voltage in that winding.
The control unit converts this alternating voltage into a DC voltage proportional to the applied
force. If the measurement force changes direction, the sensor signal changes also polarity.
When choosing a mounting arrangement it is important to remember to position the load cell in a
direction that gives sufficient measuring force (FR) to achieve the highest possible accuracy.
The load cell has no particular correct orientation; it is positioned in the orientation best suited for
the application, bearing in mind the positions of the screw holes. The load cell can also be installed
with the roll suspended under the load cell.
The load cell has the same sensitivity in both directions, so that the load cell can be installed in
the easiest manner.
Typical mounting arrangements are horizontal and inclined mounting.
A coordinate system is defined for the load cell. This is used in force calculations to derive force
components in the load cell principal directions.
Where direction designations R, V and A are recognized as suffixes for force components, F, this
represents the force component in the respective direction. The suffix R may be omitted, when
measuring direction is implied by the context

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