input reference output pair 220 420 is likewise applied to the comparator 9 the output signal 620 of the comparator 9 is evaluated by the sequence controller 2 and the potentiometer 11 for adjusting the linearity of the curve is accordingly adjusted by iteration until an admissible tolerance is undershot the adjustment of the potentiometers 10 11 12 as well as amplifier 13 is repeated for all paired reference input reference output values 200 400 210 410 220 420 until a predetermined deviation between the actual output value 500 510 520 and the reference output value 400 410 420 is undershot for all reference output values 400 410 420 this linearization procedure is now repeated for different materials of measurement and the individual different linearized curves are stored in the sequence controller 2 at the beginning of the measurement after linearizing the curve the output signal 100 110 120 of the sensor is applied as an input value to the linearization circuit by means of the switch 8 that is controlled by sequence controller 2 a continuous measurement is now possible with the output signals of the sensor being linearized by means of the linearized curve 0069 fig2 illustrates a further embodiment of a device according to the invention for use with the method of the invention in this special embodiment the start of the measuring range the midpoint of the measuring range and the end of the measuring range are not accurately adjustable but can be only approximated however the actual.