The CNTX from EMX Industries Inc., Cleveland, OH, is a white LED contrast sensor that can reliably detect up to 50 grayscale levels. The device features a round spot for flexible mounting, a 2-digit display of background values and a mark for available switching margin, the ability to lock the controls, and output that is automatically configured to pnp or npn on power up. The light source intensity is variable so you can adapt it to the background.
Contrast Sensor from EMX Industries
EMX Industries Inc.