The tactile thickness measuring systems DMS are optimally suited wher- ever it is possible to touch the material and where the applied pressure of the measuring rollers or rails does not alter the thickness. The user must be prepared to accept the sometimes visible traces on the material.
The tactile measurement systems usually consist of a measuring roller or rail which is connected to a piston rod. An adjustable pressure is applied by a spring or compressed air through the piston rod. The piston rod is coupled to an incremental distance measuring system which converts the distance of the piston rod into a measured value. The biggest advantage of these very robust systems over the non-contact systems is that the accuracy does not depend on the size of the measuring range because the division of the integrated measuring system and thus the accuracy is independent of the length of the incremental system.
Tactile systems are therefore ideal for steelworks and in the timber industry (chipboard manufacture). When measuring steel strips, a wide measuring range caused by the waviness of the strips can be covered without impairing the measuring accuracy. Another advantage is in the direct zeroing of the tactile systems by the contacting of the measuring rollers when there is no material in the measuring line.