ABB UAC317AEV1 HIEE300725R1 programmable control module
Working temperature range
Working temperature range is the temperature range within which the load cell can operate within
a specified accuracy. The maximum permitted temperature drifts (i.e. zero point and sensitivity
drifts) of the load cell are not necessarily maintained in the whole working temperature range.
Storage temperature range
Storage temperature range is the temperature range within which the load cell can be stored.
Zero point drift with temperature
Zero point drift is defined as the signal change with temperature, related to the sensitivity, when
there is zero load on the load cell.
Sensitivity drift with temperature
Sensitivity drift is defined as the signal change with temperature at nominal load, related to the sen sitivity, excluding the zero point drift.
Measuring principle of the sensor
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 mag netic 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 propaga tion of the magnetic
fieKd changes so that it surrounds the secondary winding, inducing an alternat ing 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.
Figure 9. Propagation of magnetic fieKd around secondary winding due to mechanical force on sensor

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.
2.5.1 Coordinate System
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.
R= Measuring direction
V= Transverse direction
A= Axial direction
Figure 10. Coordinate system defining directions used in force calculation
2.5.2 Horizontal Mounting
In the majority of cases horizontal mounting is the most obvious and easiest mounting method.
When calculating the force, the equations below must be used:
FR = T × (cos β - cos α)
FRT = 0
FRtot = FR + FRT = T × (cos β - cos α)
FV
= T × (sin α + sin β)
FVT = Tare
FVtot = FV
+ FVT = T × (sin α + sin β) + Tare
where:
T = Web/strip tension
FR = Force component from web/strip tension in measurement direction, R
FRT = Force component from Tare in measurement direction, R
FRtot = Total force in measurement direction, R
FV
= Force component from web/strip tension in transverse direction, V
FVT = Force component from Tare in transverse direction, V
FVtot = Total force in transverse direction, V
Tare = Force due to tare weight