Omron E3T-ST21M 5M Through-Beam Photoelectric Sensor
The Omron E3T-ST21M 5M Photoelectric Sensor is an ultracompact, ultrathin through-beam sensor with 300 mm sensing distance and NPN output for precise object detection. This M3-mounting sensor uses a Red LED light source, operates on 12 to 24 VDC, supports Light-ON operation, and is supplied with a 5 m pre-wired cable. Manufactured by Omron, it is part of the Omron Photoelectric Sensors range under the Omron E3T Series.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3T-ST21M 5M |
Omron E3T-ST21M 5M Photoelectric Sensor - Technical Specifications
| Specification | Value |
|---|---|
| Sensing Method | Through-beam |
| Shape | Square type |
| Sensing Distance | 300mm |
| Power Supply Voltage | 12 to 24 VDC |
| Output Configuration | NPN |
| Connection Method | Pre-wired cable length 5m |
| Current Consumption | 30 mA max. (Emitter 10 mA max., Receiver 20 mA max.) |
| Light Source (Wavelength) | Red LED |
| Operation Mode | Light-ON |
| Response Time | 1 ms max. |
| Degree Of Protection | IP67 |
| Material | Polybutylene terephthalate |
| Material Lens | Denatured Polyarylate |
| Weight | 40g |
The Omron E3T-ST21M 5M is a through-beam photoelectric sensor designed for space-constrained automation equipment requiring accurate detection. This ultrathin sensor integrates a built-in amplifier and provides 300 mm sensing range, NPN transistor output, and stable 12β24 VDC operation. As part of the E3T series, it supports reliable sensing in compact industrial systems.
In practical applications, the E3T-ST21M 5M photoelectric sensor is used in electronic assembly lines, semiconductor equipment, small conveyors, and precision positioning systems. Its M3 mounting structure enables easy installation in narrow spaces, while through-beam detection ensures consistent sensing of small or fast-moving objects in automated processes.
The Omron E3T-ST21M 5M sensor is engineered for long-term industrial use with dependable optical performance and electrical stability. Its red LED light source, fixed cable wiring, and noise-resistant output make it suitable for continuous operation. Engineers selecting ultracompact through-beam sensors recognize the E3T series for consistent detection accuracy and integration reliability in industrial automation.
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