The pneumatically driven measuring heads are integrated in the measuring frame and thus extensively protected against mechanical influences. In case of a continuous measuring material, hardened and ground precision measuring rollers are used. The measuring rollers’ running surface is designed in accordance to the respective measuring material’s surface condition (e.g. crowned or cylindrical running surface).
By optional air pressure adjusting at the plotting device the measuring-power can be changed and adjusted to the measuring-material.
After each measuring process, the appliance is automatically re-calibrated by placing the measuring scanners directly on top of each other and zeroizing them. Thereby a high measuring safety and accuracy is guaranteed. Longterm wear and tear and thermal deformation are completely compensated for. Each measuring-process starts from the current zero position.