Key Specifications Parameter Specification Model E3ZG-R81 2M Brand OMRON (Omron Automation and Safety) Series E3ZG (Amplifier Built-in Photoelectric Sensor) Sensing Method Retro-reflective (with MSR function) Optical Characteristics Parameter Specification Sensing Distance 0.1 to 4 m (with E39-R1S reflector) Minimum Sensing Object Opaque object φ75 mm or more Light Source Red LED (624 nm wavelength) Beam Shape (Reference) φ8 mm at 350 mm Hysteresis 3% or less of sensing distance Directional Angle 2 to 10° Electrical Characteristics Parameter Specification Output Type PNP Open Collector Output Mode Light-ON / Dark-ON (Selectable via button) Rated Supply Voltage DC10 to 30 V (including ripple) Current Consumption 30 mA or less Load Current 100 mA or less Residual Voltage 1 V max (at load current ≤10 mA); 2 V max (at load current 10-100 mA) Response Time 1 ms or less (operation/reset) Protection Circuits Reverse polarity protection (power supply), short-circuit protection (output), reverse polarity protection (output) Mechanical & Environmental Characteristics Parameter Specification Degree of Protection IP65 (IEC 60529) Connection Method Pre-wired cable (2 m, PVC) Indicators Operation indicator (orange), stability indicator (green) Ambient Temperature (Operating) -25°C to +55°C (with no icing or condensation) Ambient Humidity (Operating) 35% to 85% RH Ambient Illumination Incandescent lamp: 10,000 lx max; Sunlight: 10,000 lx max Insulation Resistance 20 MΩ min (at 500 VDC) Dielectric Strength 1,000 VAC 50/60 Hz for 1 minute Vibration Resistance 10 to 55 Hz, 1.5 mm double amplitude, 2 hours each in X/Y/Z directions Shock Resistance 500 m/s², 3 times each in X/Y/Z directions Housing Material Resin Standards & Approvals CE, UL, cUL