Balluff BES 516-211-E5-E-S21 Inductive Proximity Sensor

Balluff BES 516-211-E5-E-S21 is a cylindrical inductive proximity sensor in an M18 housing with a length of 70.5 mm and M18x1 thread, designed for flush installation and metal-to-metal detection with a nominal sensing distance of 5 mm. The device uses a nickel-plated brass housing with a PA12 sensing face and provides IP67 protection for rugged industrial environments; it is offered in the S21 variant with a 2-wire DC/AC switching output configured as normally open. The operating voltage range spans 20 to 250 V (AC/DC), enabling compatibility with both AC and DC control logic, and it supports a switching frequency around 400 Hz with a maximum operating current of about 250 mA. Ambient temperature range is -25 to +70 °C, making it suitable for outdoor or workshop environments, and it can be flush-mounted to minimize profile on machinery or conveyors. Typical applications include position sensing on metal parts, end-of-arm tooling, automation lines, and safety interlocks in manufacturing setups.