Panasonic ex 20 series ultra compact photoelectric sensors panasonic ex23pn an ultra compact photoelectric sensor with a 2m sensing range this side sensing sensor is of the through beam type and has a built in amplifier mountable using m3 fixings and has a good basic performance with a clear beam spot from a red led light source the sensor has an ip67 protection rating and with its mounting design is suitable for a range of detection and sensing applications including for use in harsh