Operating hours meter having a magnetic sensor

摘要: The invention relates to a measuring device for recording the running time of machine tool having an electric motor, said containing: at least one sensor by means which magnetic field generated in can be detected and signal value when is detected; counter counting mechanism; comparator circuit, designed compare with previously defined reference and, if greater than value, start mechanism less stop mechanism. further method tool, comprising steps: detection motor; generation corresponding field; comparison value; starting stopping value. Fig.