The nominal force [N / kN / MN] is the force for which the force sensor is nominally designed.
Percentage values (e.g. breaking force, limit force, etc.) in the "Technical data" tables of the data sheets refer to the corresponding nominal force of the force sensor (based on Fnom).

The HAEHNE web tension sensors are generally designed for a specific measuring direction marked in
most cases by a red dot. Web forces in that measuring direction generate positive force signals.
If the forces do not act exactly in the measuring direction, the sensor will display a lower force
according to the angles of the acting forces.
The measuring ranges follow a geometrical progression and enable a sensor selection most suitable for
the actual web tension force situation. The necessary measuring range is determined by the
largest expected web tension force and the web tension geometry (compare diagrams).
The machine design determines the infeed and runout web angles. This specifies also the
direction of the force vectors F1 and F2. For the calculation it is assumed that the measuring roll is
neither driven nor braked and that the bearing friction is negligible. Under this condition the values of
the vectors are equal to the maximum web tension force. Trigonometric functions and the actual mounting
situation of the sensors enable the calculation of the web tension force in the measuring direction.
The sum of the two parts FM1 and FM2 acts on the roll and half of the total on each sensor. In case of
horizontal measurement it is not necessary to account for the roll weight, because it acts only vertically.
However, in case of horizontal measurement the maximum permitted transverse force according to the
product specification has to be observed.
Roll weight forces in the measuring direction can be zero adjusted at the amplifier.

Our software for calculating the measuring force, which is available online or as a download offline, offers help in calculating the nominal force.