CalFree from METTLER TOLEDO is a calibration method that is less accurate than using test weights, however, it offers a solution for the calibration of tanks, vessels, silos and hoppers where it is impractical to place test weights or for applications which need an approximate calibration only.
The CalFree uses factory calibrated load cells. The actual output of the individual load cells is measured and recorded during the production process and supplied with each load cell. The outputs of each individual load cell of the respective scale are averaged and entered into a dedicated weighing terminal from METTLER TOLEDO with CalFree capability. The terminal uses this average output to compute a theoretical calibration which is less accurate than using test weights, since it does not take into account the actual mechanical characteristics of the scale.
Users who only need an approximate calibration would find this method useful to confirm the operational integrity of the overall system. Furthermore it is possible to replace a load cell or terminal quickly by calibrating with this method.