Omron E3T-ST22M 2M Through-Beam Photoelectric Sensor
Omron E3T-ST22M 2M is an ultracompact M3-mounting through-beam photoelectric sensor designed for sensing targets over a 300 mm distance. A red LED establishes the optical beam between the emitter and receiver, while the integrated amplifier processes the change caused when an object interrupts that beam. The NPN output supplies the resulting switching state to compatible control equipment, and Dark-ON operation determines the specified logic. The sensor operates from 12 to 24 VDC and includes a 2 m pre-wired cable. Maximum current consumption is 30 mA, with 10 mA maximum allocated to the emitter and 20 mA maximum to the receiver. Within the E3T Series, the E3T-ST22M 2M provides the M3 Dark-ON configuration. Related ultrathin through-beam sensors can be reviewed across Omron Industrial Sensor Products.
| Brand | Omron |
| Product | Photoelectric Sensors |
| Model Number | E3T-ST22M 2M |
Omron E3T-ST22M 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 | Dark-ON |
| Response Time | 1 ms max. |
| Degree Of Protection | IP67 |
| Material | Polybutylene terephthalate |
| Material Lens | Denatured Polyarylate |
| Weight | 40g |
The Omron E3T-ST22M 2M Photoelectric Sensor uses through-beam sensing across a 300 mm distance in an ultracompact M3-mounting format. Its red LED establishes the beam between the emitter and receiver, while the integrated amplifier evaluates the optical change when a target interrupts that path. An NPN output transfers the resulting switching state to compatible machine-control circuitry, and Dark-ON operation provides the specified logic. The sensor operates from 12 to 24 VDC and includes a 2 m pre-wired cable. Current consumption is 30 mA maximum, comprising 10 mA maximum for the emitter and 20 mA maximum for the receiver. Response time is specified at 1 ms maximum for rapid switching.
For an Omron M3 through-beam sensor requiring NPN output with Dark-ON behavior, the corresponding model is the E3T-ST22M. Its ultrathin square format supports restricted machine spaces where larger photoelectric sensors may not fit. The supplied specification lists IP67 protection, while PBT and denatured polyarylate are specified as construction materials. Its configuration also aligns with searches for an Omron compact NPN sensor and Omron 300 mm Dark-ON sensor. The separate emitter and receiver establish the optical path used for target sensing, making alignment an important installation consideration. For the Light-ON M3 alternative using the same 2 m cable, NPN output, and 300 mm range, see the E3T-ST21M 2M.
