Omron E3T-ST21 5M Through-beam Photoelectric Sensor
The E3T-ST21 5M Photoelectric Sensor is an ultracompact through-beam sensor offering 300 mm sensing distance with reliable object detection in limited spaces. Designed as an ultrathin photoelectric sensor with built-in amplifier, it features NPN output, Light-ON operation, and a red LED light source while operating on 12 to 24 VDC. Manufactured by Omron, this sensor is part of the Omron Photoelectric Sensors range and belongs to the Omron E3T Series, supporting M2-mounting sensor installations.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3T-ST21 5M |
Omron E3T-ST21 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-ST21 5M is an ultracompact through-beam photoelectric sensor developed for precise detection in space-constrained automation systems. As an ultrathin photoelectric sensor with built-in amplifier, it provides 300 mm sensing distance, NPN output, and stable 12β24 VDC operation, ensuring consistent signal performance in industrial environments.
In practical applications, this through-beam M2-mounting sensor is commonly used in electronic assembly lines, packaging machines, small conveyors, and inspection equipment. Its slim square design allows easy installation in tight mounting locations, while the red LED light source ensures dependable object detection in short-range sensing tasks.
The E3T-ST21 5M sensor is engineered for long-term industrial use with reliable electrical characteristics and compact construction. As part of the E3T Series photoelectric sensors, it supports stable operation, accurate switching, and compatibility with modern control systems. Engineers selecting ultracompact photoelectric sensors value this model for consistent performance, compact mounting, and dependable detection in automated production setups.
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