Series 9000™ Diagnostic Photoelectric Sensors provide both a visual and electrical indication of a dirty lens condition. This is useful in applications where dirt and dust build-up on the optic lens is expected. You can operate the sensor in static mode or dynamic mode. The static mode of operation is for Web applications where you need an immediate indication of an unstable sensing condition. This condition occurs when the margin level is greater than 0.7X and less than 1.5X.