Omron E3T-ST31 2M Photoelectric Sensor
The Omron E3T-ST31 2M Photoelectric Sensor is an ultracompact through-beam offering a 2 m sensing distance, NPN output, Light-ON mode, and red LED (650 nm) light source for precise detection. It operates on a 12 to 24 VDC power supply and includes a 2 m pre-wired cable for easy installation. This sensor is part of the Omron industrial range under the Omron Photoelectric Sensors category and the Omron E3T Series. With 30 mA current consumption, IP67 protection, 1 ms response time, and open-collector output, it ensures fast and durable sensing for industrial use.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3T-ST31 2M |
Omron E3T-ST31 2M Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Through-beam |
| Sensing Distance | 2 m |
| Standard Sensing Object | Opaque, 3-mm dia. min. |
| Light Source | Red LED (650 nm) |
| Power Supply Voltage | 12 to 24 VDC , ripple (p-p) 10% max. |
| Output Configuration | NPN |
| Connection Method | Pre-wired 2 M cable |
| Current Consumption | 30 mA max. (Emitter 10 mA max., Receiver 20 mA max.) |
| Control Output | Load power supply voltage: 26.4 VDC max. Load current: 50 mA max. (residual voltage: 2 V max. for load current of 10 to 50 mA, 1 V max. for load current of less than 10 mA) Open-collector output |
| Operation Mode | Light-ON |
| Response Time | Operate or reset: 1 ms max. |
| Indicators | Operation indicator (orange), Stability indicator (green) |
| Ambient Illumination | Incandescent lamp: 5,000 lx max., Sunlight: 10,000 lx max. |
| Ambient Temperature Range | Operating: −25 to 55°C Storage: −40 to 70°C (with no icing or condensation) |
| Ambient Humidity Range | Operating: 35% to 85% Storage: 35% to 95% (with no condensation) |
| Insulation Resistance | 20 MΩ min. at 500 VDC |
| Dielectric Strength | AC1,000V, 50/60 Hz for 1 min. |
| Vibration Resistance | 10 to 2,000 Hz, 1.5-mm double amplitude or 300 m/s2 for 0.5 hours each in X, Y, and Z directions |
| Shock Resistance | 1,000 m/s2 3 times each in X, Y, and Z directions |
| Protection Circuits | Power supply and control output reverse polarity protection, Output short-circuit protection |
| Degree Of Protection | IEC 60529 IP67 |
| Material | PBT (polybutylene terephthalate), Denatured polyarylate |
| Weight | Approx. 40 g |
Omron is known for compact and high-precision sensing solutions, and the Omron E3T-ST31 2M continues this legacy. This Omron Ultracompact, Ultrathin Photoelectric Sensor is designed for space-constrained environments where traditional sensors cannot fit. With robust protection and accurate detection, the E3T ST31 2M helps manufacturers maintain automation efficiency in tight spaces.
The Omron E3T-ST31 2M uses a through-beam sensing method and detects opaque objects as small as 3 mm diameter at a distance of up to 2 meters. It features a Red LED at 650 nm, operates on 12 to 24 VDC, and delivers NPN output via a 2-meter pre-wired cable. It is rated IP67 and includes polarity and short-circuit protection.
The E3T ST31 2M is widely used in packaging machines, compact conveyors, semiconductor tools, and robotic arms. Its quick 1 ms response time and stable performance make it perfect for detecting small parts in fast-paced production lines. The Omron E3T-ST31 2M is a trusted Omron Ultracompact, Ultrathin Photoelectric Sensor for high-precision industrial applications.
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