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E3T-ST21 Safety Light Curtain | F3SJ Series Industrial Safety Sensor

The Omron E3T-ST21 is an ultra-compact, ultra-thin through-beam photoelectric sensor with a built-in amplifier . It features a square-shaped side-view housing and uses a red LED light source with a wavelength of 650 nm .

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Key Specifications Parameter Value Manufacturer Omron Automation and Safety Series E3T Sensing Method Through-beam (Thru-beam) Sensing Distance 300 mm (0.3 m) Light Source Red LED (650 nm wavelength) Output Type NPN open-collector Operation Mode Light-ON Supply Voltage 12 to 24 VDC ±10% (ripple P-P 10% max.) Current Consumption Emitter: 10 mA max., Receiver: 20 mA max. Control Output Rating 50 mA max. at 26.4 VDC max. (Residual voltage: 1V max. at <10mA, 2V max. at 10-50mA) Response Time 1 ms max. (Operate and reset) Standard Sensing Object Opaque object, 2 mm diameter min. Minimum Sensing Object 2 mm diameter (opaque) Directional Angle Emitter: 2 to 20°, Receiver: 2 to 70° Ambient Illuminance Incandescent lamp: 5,000 lx max., Sunlight: 10,000 lx max. Ambient Temperature (Operating) -25 to 55°C (with no freezing or condensation) Ambient Humidity (Operating) 35% to 85% (with no condensation) Insulation Resistance 20 MΩ min. (at 500 VDC) Dielectric Strength 1000 VAC, 50/60 Hz for 1 minute Vibration Resistance (Destruction) 10 to 2000 Hz, 1.5 mm or 300 m/s² double amplitude for 0.5 hours each in X, Y, Z directions Shock Resistance (Destruction) 1000 m/s², 3 times each in X, Y, Z directions Protection Rating IP67 Connection Method Pre-wired (2m cable) Indicators Operation indicator (orange), Stability indicator (green) Housing Material Case: Polybutylene terephthalate (PBT), Lens: Denatured Polyarylate Dimensions (W x H x D) 9.5 mm x 18.5 mm x 7 mm Weight Approx. 40 g (packaged)