Omron E3Z-T61 Through-Beam Photoelectric Sensor, NPN Open-Collector, 12-24 VDC, 15 m Sensing, IP67

The E3Z-T61 features an NPN open-collector (sinking) output. Connect the brown wire to +12-24VDC, the blue wire to 0V (GND), and the black output wire to your PLC input or microcontroller pin (with a pull-up resistor to +V for logic-high detection). The sensor sinks current to ground when an object is detected.

Yes, the Omron E3Z-T61 is specifically rated for operation from -40°C to +55°C, making it an ideal choice for cold storage warehouses, refrigeration units, and outdoor applications where freezing temperatures are present, without requiring a protective enclosure.

Through-beam uses separate emitter and receiver units, providing the longest sensing distance and highest reliability as it detects the interruption of a direct beam. This contrasts with diffuse-reflective (sensor and target in one unit) or retro-reflective modes, which are more susceptible to target color and surface reflectivity.

The sensor includes built-in mutual interference prevention circuitry. For best results, ensure a minimum separation distance between adjacent sensors as specified in the datasheet, use modulated light sources if available, and physically orient sensors so their beams are not aligned with neighboring receivers.

The sensor comes with a fixed, integrated 2-meter PUR cable that is oil-resistant and durable. For longer runs, you can splice and extend the cable using proper waterproof connectors, but care must be taken to maintain signal integrity and the IP67 rating at the connection point.