Omron E3T-ST21M 2M Photoelectric Sensor
The Omron E3T-ST21M 2M Photoelectric Sensor is an ultracompact, ultrathin through-beam sensor with a 300 mm sensing distance designed for space-limited automation applications. This M3-mounting sensor features NPN output, Red LED light source, Light-ON operation, and operates on a 12 to 24 VDC power supply with a pre-wired 2 m cable. Manufactured by Omron, it is part of the Omron Photoelectric Sensors category and belongs to the Omron E3T Series.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3T-ST21M 2M |
Omron E3T-ST21M 2M 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 2m |
| 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 2M is an ultracompact photoelectric sensor with a built-in amplifier, developed for precise object detection in industrial automation. As a through-beam sensor, it supports 300 mm sensing using a Red LED light source and provides stable NPN output for reliable signal transmission in control systems.
In practical applications, this ultrathin M3-mounting photoelectric sensor is used in compact machinery, electronic assembly lines, packaging equipment, and conveyor systems. Its small square form factor allows installation in tight spaces where standard sensors cannot fit, while the through-beam principle ensures accurate detection of small or fast-moving objects.
The E3T-ST21M 2M sensor operates on a 12β24 VDC power supply and supports Light-ON mode for consistent detection logic. Designed for long-term industrial use, it offers stable performance, low power consumption, and dependable operation in automated environments where space efficiency and sensing accuracy are critical.
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