The EE-SPX series is a ultra-small photoelectric sensor with a slot of 5mm. They are can be used as a location switch, such as elevator detection. Because of the small slot, they also can be used for liquid drop detection.    

• High performance ASIC based sensor with advanced modulation scheme and built in amplifier
• Excellent noise immunity to DC light with modulated light source and CDS signal process technology
• Ultra-small slot structure with location holes for easy installation
• Light on or dark on switchable
• Fast response time: 1ms
• 5mm slot width, can replace the same model of Omron