The E3XNA11 is a standard, pre-wired fiber amplifier unit designed for ease of use in various sensing applications. It operates on a 12 to 24 VDC power supply and utilizes a red LED light source with a 680 nm wavelength. Key features include a fast operating response time of 20 µs, an 8-turn endless adjuster for precise sensitivity tuning, and a Light-ON/Dark-ON selectable NPN open-collector output capable of handling a 50 mA load current. The unit is equipped with reverse polarity and output short-circuit protection, as well as optically synchronized mutual interference prevention, making it suitable for compact, multi-unit installations.