Omron E3T-ST12M 2M Photoelectric Sensor
Omron E3T-ST12M 2M is an ultracompact through-beam photoelectric sensor for sensing opaque objects across a distance of up to 1 m. A 650 nm red LED establishes the optical path between the separate emitter and receiver, while the NPN open-collector output operates in Dark-ON mode. The sensor runs from 12 to 24 VDC, responds within 1 ms, and uses a 2 m pre-wired cable for connection. Combined current consumption is 30 mA maximum, with 10 mA for the emitter and 20 mA for the receiver. Within the E3T Series, the E3T-ST12M 2M provides this NPN configuration. Related 1 m through-beam sensors are available across Omron Sensors.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3T-ST12M 2M |
Omron E3T-ST12M 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-ST12M 2M Photoelectric Sensor uses through-beam sensing across a 1 m range with separate emitter and receiver units. A 650 nm red LED provides the optical source, while opaque targets of 2 mm diameter or larger interrupt the beam. The NPN open-collector output operates in Dark-ON mode and supports a load current up to 50 mA under the stated conditions. The sensor operates from 12 to 24 VDC and responds within 1 ms. Combined current consumption is 30 mA maximum, consisting of 10 mA for the emitter and 20 mA for the receiver. A 2 m pre-wired cable provides the connection, while orange operation and green stability indicators support status checking.
For an Omron NPN through beam photoelectric sensor requiring 1 m sensing and Dark-ON operation, the corresponding model is the E3T-ST12M. Operating temperature extends from -25 to 55°C, with storage from -40 to 70°C. Ambient-light resistance reaches 5,000 lx under incandescent light and 10,000 lx under sunlight. Reverse-polarity and output short-circuit protection are included. The listed housing materials are PBT and denatured polyarylate. This specification also suits searches for an Omron 1 m NPN sensor and Omron compact through beam sensor. For a related PNP Light-ON version, see E3T-ST13 2M.
