Omron E3FB-TP21 is a through-beam photoelectric sensor set (transmitter and receiver) from the E3FB series, housed in a cylindrical M18 threaded brass body with a right-angle face. It's designed for opposed-mode sensing over a 20m range, detecting opaque objects as small as 7mm diameter. Output is PNP, selectable Light On or Dark On, with a 100mA load capacity. The M12 4-pin connector simplifies field replacement — pull the old sensor, plug in the new one. Runs on 10-30V DC and includes output short-circuit, output reverse polarity, and supply reverse polarity protection — so a miswire during commissioning won't kill the unit.
What the ratings mean for fit
Sensing distance is 20 m. Response time is 0.5 msec. IP67 and IP69K ratings mean this sensor handles washdown environments — food processing, car washes, or outdoor installations with high-pressure spray. Brass body resists corrosion in wet or acidic atmospheres. The red LED emitter is visible through dirt or condensation, and the built-in indicator lights on the sensor body give instant alignment feedback — useful when adjusting a right-angle head in a tight bracket.