Leuze Eectronic Ltd. Manufactures Through Beam Photo-electric Sensor. Leuze Eectronic Ltd. Is an ISO 9001 certified company. Leuze Eectronic Ltd. Also offers products like active optoelectronic protective devices, analysis devices and signal devices. Through Beam Photo-electric Sensor is a forked sensor for reliable detection of transparent and opaque labels. The Through Beam Photo-electric Sensor has PNP and NPN transistors for optimum adaptation to the controller. The Through Beam Photo-electric Sensor has a robust metallic housing with beveled inlet edges.