You can use this RS PRO capacitive barrel type sensor to detect metallic and non-metallic objects. The sensor uses an electrical field, allowing you to detect and measure metal and non-metal objects and contents inside non-metallic containers without physical contact.
The housing is made from nickel-copper alloy, which ensures it has strength, durability and resistance to corrosion. It's rated as IP67 according to the Ingress Protection (IP) rating system, meaning it's protected against dust and temporary immersion in water. The sensor also features reverse polarity and short circuit overload protection, so it's safe to use it in your application. Sensors like this one are generally used in transport, storage and warehouse facilities, as well as in the livestock breeding industry.

• Barrel body style
• Detection range of 2 mm
• Nickel-copper alloy housing material
• IP (Ingress Protection) rating of IP67
• Length of 65 mm
• Maximum DC voltage of 30 V (volts)
• Maximum operating temperature of +70°C
• Minimum operating temperature of -25°C
• Flush mounting style
• Output type of PNP (Positive Negative Positive)
• Reverse polarity protection
• Capacitive sensor technology
• Unshielded
• Short circuit overload protection
• CE (Conformité Européenne) standards met
• Supply voltage of 10 to 30 V DC
• Switching current of 200 mA (milliamperes)
• Switching frequency of 50 Hz
• Terminal type of M12, 4-pin
• Thread size of M12 x 1