Omron E3T-ST22 2M Photoelectric Sensor
The Omron E3T-ST22 2M Photoelectric Sensor is an ultracompact through-beam sensor offering a 300 mm sensing distance with NPN output and Dark-ON operation for precise detection. Operating on a 12–24 VDC supply, it belongs to the Omron industrial automation lineup under the Omron Photoelectric Sensors category and the Omron E3T Series. Built with a red LED (650 nm) light source and M2 mounting, it ensures stable operation with 30 mA current consumption, 1 ms response time, IP67 protection, and a durable 2 m pre-wired cable for reliable industrial performance.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3T-ST22 2M |
Omron E3T-ST22 2M Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Through-beam |
| Sensing Distance | 300 mm |
| 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 |
Built for precision, the Omron E3T-ST22 2M offers a dependable 300 mm sensing distance with a red LED (650 nm) light source. It accurately detects opaque targets as small as 2 mm and operates on a 12 to 24 VDC power supply. With its NPN open-collector output and Dark-ON mode, this sensor ensures consistent, interference-free signal processing in industrial environments. A pre-wired 2-meter cable simplifies integration into existing control systems.
The E3T-ST22 2M is designed to withstand demanding operating conditions, supporting fast 1 ms response times and offering protection against reverse polarity and output short circuits. Dual indicators—orange for operation and green for stability—allow real-time status monitoring. Its IP67-rated housing, made of robust PBT and denatured polyarylate, ensures durability even in high-moisture, dusty, or high-vibration settings. It resists shock (1,000 m/s²) and vibration (up to 300 m/s²), and operates within a wide −25 to 55°C temperature range.
Trusted by engineers across industries, the Omron E3T-ST22 2M photoelectric sensor is a reliable choice for compact automation solutions requiring precise detection, fast response, and environmental resilience.
