You can use this RS PRO retroreflective photoelectric block style sensor to detect and measure physical objects and quantities. It emits a beam of electromagnetic radiation that detects alterations in the return signal.
The sensor features a nickel-plated brass housing for resistance to wear and corrosion. The housing is made from polymethyl methacrylate (PMMA) and Acrylonitrile Butadiene Styrene (ABS) material to ensure it's strong, resistant to corrosion and lightweight. It has an Ingress Protection (IP) rating of IP67, which means it's protected against dust and temporary immersion in water.
You can adjust the sensing distance via a teach-in button. The sensor comes with reliable M12 lock nuts, so you have the elements you need for installation.

• Detection range of 150 mm to 10 m
• Retroreflective detection type
• 4-pin electrical connection
• M12 connector
• ABS (Acrylonitrile Butadiene Styrene), PMMA (Polymethyl Methacrylate) housing material
• Ingress Protection (IP) rating of IP67
• LED light source
• Maximum current of 100 mA (milliamperes)
• Maximum DC voltage of 30 V (volts)
• Maximum operating temperature of +60°C
• Minimum operating temperature of -30°C
• Flange mounting type
• Phototransistor optical technology
• Output type of NPN (Negative Positive Negative)
• Response time of 2.5 ms
• Block sensor style
• Meets CE (Conformité Européenne) and E348498, NRKH7 UL (Underwriter Laboratories) listed standards
• RoHS (Restriction of Hazardous Substances) compliant