ELTENS web tension measuring system

The load cell comprises a stable outer ring with flange cover and centering collar for precision assembly. The inner ring in the form of a double bending beam ensures centered mounting of the ball bearing. The radial forces created by the web unbalance the strain gauges linked together to form a measuring bridge on the inner ring. This leads to an analog output signal proportional to the web tension.

Flange load cells are used in practically all production plants where web-type materials are processed or finished. In front of processing stations, in particular, it is of fundamental importance that the web is transported with a continuous web tension.

With a 90° horizontal-vertical wrapping angle on the measuring roller and a horizontal measuring direction, optimal acquisition of the web tension is assured. Only the double-sided acquisition of the resulting force on the left and right FR/K prevents incorrect measurements caused by lateral web movement and asymmetrical web tension distribution. Load cells incorporated into a closed control loop are to be mounted as near as possible to the actuator.

The tensile force-path characteristic curve forms a straight line to the mechanical stop. All the load cells with the exception of the PD 25 series are calibrated to the nominal measuring force. Between the nominal measuring force and mechanical stop, a safety factor of 50 to 100 percent is taken into account to compensate for asymmetrical web tension distribution.