Omron E3T-FT21 2M Photoelectric Sensor
Omron E3T-FT21 2M is an ultrathin through-beam photoelectric sensor designed for sensing opaque targets across a 300 mm distance. A 650 nm red LED establishes the optical path between the emitter and receiver, while the NPN open-collector output supplies the switching state to compatible industrial control circuitry. Light-ON operation is specified, with an operate or reset time of 1 ms max. The sensor operates from 12 to 24 VDC and includes a 2 m pre-wired cable. Its sensing specification includes opaque targets down to 1.3 mm diameter. Within the E3T Series, the E3T-FT21 2M provides the 300 mm Light-ON option. Related 300 mm through-beam sensors are available across Omron Industrial Products.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3T-FT21 2M |
Omron E3T-FT21 2M Photoelectric Sensor – Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Through-beam |
| Sensing Distance | 300 mm |
| Standard Sensing Object | Opaque, 1.3-mm dia. min. |
| Light Source | Red LED (650 nm) |
| Power Supply Voltage | 12 to 24 VDC |
| 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 |
The Omron E3T-FT21 2M Photoelectric Sensor uses through-beam sensing across a maximum distance of 300 mm for opaque targets. The sensing set uses the E3T-FT21-L emitter and E3T-FT21-D receiver. A 650 nm red LED establishes the optical path, while the NPN open-collector output transfers the switching state from the receiver to compatible control equipment. Light-ON operation is specified. The sensor operates from 12 to 24 VDC, with combined current consumption of 30 mA max., consisting of 10 mA max. for the emitter and 20 mA max. for the receiver. Operate or reset time is 1 ms max. A 2 m pre-wired cable provides connection, while the stated minimum opaque target diameter is 1.3 mm.
For an Omron NPN through beam photoelectric sensor requiring 300 mm sensing and Light-ON operation, the corresponding model is the E3T-FT21. Output load current is specified at 50 mA max., with a load supply voltage of 26.4 VDC max. Operating temperature extends from -25 to 55°C, while storage is specified from -40 to 70°C. Reverse-polarity and output short-circuit protection are listed, along with IP67 protection. PBT and denatured polyarylate are among the stated materials. Its configuration also suits searches for an Omron 300 mm through beam sensor and Omron small object NPN sensor. For the related Dark-ON model with the same sensing distance, see E3T-FT22 2M.
