You can use this RS PRO background suppression block type sensor to detect objects close together without detecting the background material, while also precisely controlling the sensing range. It contains the transmitter and receiver in a single housing, making it easier to mount.
The housing is made from polycarbonate (PC) and Acrylonitrile Butadiene Styrene (ABS) material to ensure durability and impact and abrasion resistance. It has an Ingress Protection (IP) rating of IP67, which means it's shielded against dust and temporary immersion in water. The device has a very quick response time and allows you to adjust the sensitivity, so you can use it in a variety of applications. It also has a visible red light, which helps you align the sensor.

• Detection range of 5 to 250 mm
• Background suppression detection type
• 4-pin M8 connector electrical connection
• ABS (American Bureau of Shipping), PC (Polycarbonate) housing material
• IP (Ingress Protection) rating of IP67
• Maximum current of 100 mA (milliamperes)
• Maximum DC voltage of 24 V (volts)
• Maximum operating temperature of +55°C
• Minimum operating temperature of -25°C
• Flange mounting type
• LED (Light Emitting Diode) and phototransistor optical technology
• Output type of NPN (Negative-Positive-Negative)
• Response time of 625 μs (microseconds)
• Block sensor style
• Meets CE (Conformité Européenne) and E348498, NRKH7 UL (Underwriter Laboratories) listed standards
• RoHS (Restriction of Hazardous Substances) compliant