The length, weight and volume of the unit have been optimized in such a way that axial forces and bending moments in the measuring range have a minimal effect on the sensor element. Shear strains in the torsion shaft are measured accurately by means of metal foil strain gauges connected as a Wheatstone Bridge on the sensor element. Applying a supply voltage generates an electrical output signal that is directly proportional to the applied mechanical torque.
The standardization of the sensor output signals means that it is easy to exchange the sensor without having to recalibrate the measuring chain. By means of an amplifier the sensor output signal can be converted, for instance, to a standard signal (0 ... 10 V, 0/4 ... 20 mA), or can be sent directly to a PC through a USB interface. Accurate display and evaluation units complement the range of possible applications.
The sensors, particularly those with small measuring ranges, must be mounted carefully. It is important that the drive and measuring ends are not reversed during assembly. The measuring shaft should always be cleaned prior to assembly, to ensure that no foreign objects are sticking to it. It is recommended that the sensor is electrically connected and that the output signal is observed at the time of assembling. Vibrations originating in the equipment should be kept away from the sensor. The sensor should only be mounted on the coupling after the parts have been accurately aligned. This should be done without backlash or lateral forces.
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