Omron E3T-ST12 2M Photoelectric Sensor
The Omron E3T-ST12 2M Photoelectric Sensor is an ultracompact through-beam with 1 m sensing distance, NPN output, and Dark-ON operation using a red LED (650 nm) light source. It operates on 12 to 24 VDC power supply and comes with a 2 m pre-wired cable for easy connection. Manufactured by Omron, it is part of the Omron Photoelectric Sensors range under the Omron E3T Series. Designed for detecting opaque objects as small as 2 mm, this IP67-rated sensor ensures fast 1 ms response time and stable industrial performance with 30 mA max current consumption and open-collector output.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3T-ST12 2M |
Omron E3T-ST12 2M Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Through-beam |
| Sensing Distance | 1 m |
| Standard Sensing Object | Opaque, 2-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 | Dark-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 |
The Omron E3T-ST12 2M offers a sensing distance of 1 meter using a through-beam configuration, making it suitable for detecting opaque objects as small as 2 mm in diameter. It operates on a 12 to 24 VDC power supply with low current consumption of just 30 mA (10 mA for the emitter, 20 mA for the receiver). This sensor integrates a red LED light source (650 nm), and provides a rapid 1 ms response time with NPN open-collector output in Dark-ON mode, ensuring high-speed performance in critical applications.
Status indicators include a green stability LED and an orange operation LED to simplify on-site diagnostics. The sensor includes a 2-meter pre-wired cable for plug-and-play integration into compact control cabinets or mobile equipment. To protect against system failures, it features reverse polarity protection and short-circuit protection, allowing for safe and stable operation under dynamic conditions.
Built with a rugged enclosure made from PBT and denatured polyarylate, the Omron E3T-ST12 2M Photoelectric Sensor meets the IP67 standard under IEC 60529, resisting dust, water, vibration up to 2,000 Hz, and shock up to 1,000 m/s². Weighing just 40 g, it’s highly versatile for compact automation setups requiring fast, precise, and long-range detection.
