Contrast sensor. TL46 line offers the best performance and most complete selection of contrast sensors for print registration mark detection. TL46-W basic models allow a teach-in setting by means of two pushbuttons, clearly defined as mark and background. Red, White or RGB LED emission. Automatic, manual and dynamic setting. Trimmer or Teach-in with 4 digit display. 15, 20 or 30 kHz switching frequency. NPN/PNP selection and analogue output.