Key Specifications Parameter Specification Model E3T-FT21 (Emitter + Receiver set) Type Through-beam Photoelectric Sensor (Built-in Amplifier) Sensing Distance 300 mm Output Type NPN open collector Operation Mode Light-ON Light Source Infrared LED (860 nm) - Invisible beam Standard Sensing Object Opaque object, 1.3 mm diameter min. Detailed Specifications Parameter Specification Power Supply Voltage 12 to 24 VDC ±10% (ripple p-p 10% max.) Current Consumption Emitter: 10 mA max.; Receiver: 20 mA max. Control Output Current 50 mA max. (26.4 VDC max.) Residual Voltage 1 V max. (load current <10 mA); 2 V max. (load current 10-50 mA) Response Time Operate or reset: 1 ms max. Directional Angle Emitter: 3 to 25°; Receiver: 3° min. Protective Circuits Output short-circuit protection, Output reverse polarity protection, Power supply reverse polarity protection Environmental & Protection Specifications Parameter Specification Degree of Protection IP67 – Dust-tight and protected against temporary immersion Ambient Temperature (Operating) -25 to 55°C (with no freezing or condensation) Ambient Temperature (Storage) -40 to 70°C Ambient Humidity (Operating) 35% to 85% (with no condensation) Ambient Illuminance Incandescent: 5,000 lx max.; Sunlight: 10,000 lx max. Vibration Resistance (Destruction) 10 to 2000 Hz, 1.5 mm or 300 m/s², 0.5 hours each in X/Y/Z Shock Resistance (Destruction) 1,000 m/s², 3 times each in X/Y/Z Insulation Resistance 20 MΩ min. (500 VDC megger) Dielectric Strength 1,000 VAC 50/60 Hz for 1 min Physical Specifications Parameter Specification Connection Method Pre-wired cable, standard length 2 m Indicators Receiver only: Operation indicator (orange), Stability indicator (green) Case Material Polybutylene terephthalate (PBT) Lens Material Denatured Polyarylate Dimensions (Housing) Approx. 12 mm (W) × 3.5 mm (H) × 19 mm (D) Mounting Method M2 screw mounting Weight (Packaged) Approx. 40 g