E3T-ST12 2M Product Overview
The E3T-ST12 2M is an ultra-compact, ultra-thin built-in amplifier through-beam photoelectric sensor from Omron's E3T series, consisting of a paired emitter and receiver. The E3T-ST12 2M's sensor housing measures just 15×10×7mm, made of PBT material with a 2-meter PVC oil-resistant cable. The sensing distance is 1m, utilizing a red LED light source (650nm wavelength). The output of the E3T-ST12 2M is NPN open collector with Dark-ON operation mode. Response time is less than 1ms. Protection rating is IP67. The E3T-ST12 2M is widely used in semiconductor wafer tray positioning, blister pack jam detection, and micro-assembly robotic gripper sensing.
E3T-ST12 2M Core Features
Ultra-Compact and Ultra-Thin Design：The E3T-ST12 2M features a flat PBT housing with dimensions of just 15×10×7mm. Its ultra-compact size allows installation in tight spaces where traditional sensors cannot fit, ideal for semiconductor manufacturing and micro-assembly robotics.
1m Long-Distance Through-Beam Detection：The E3T-ST12 2M uses a through-beam sensing method with a detection range of 1m. The separate emitter and receiver enable long-distance, high-precision object detection, suitable for conveyor object detection and passage monitoring.
NPN Output with Dark-ON Operation：The E3T-ST12 2M's output is NPN open collector with Dark-ON operation mode (output ON when light is interrupted), making it ideal for object presence and blockage detection.
IP67 Protection Rating：The E3T-ST12 2M is IP67 rated for dust-tight and temporary immersion protection, ensuring stable operation in harsh industrial environments.
Fast Response Time：The E3T-ST12 2M has a response time of less than 1ms, enabling precise detection in high-speed automation and packaging lines.
Red LED Light Source：The E3T-ST12 2M uses a red LED light source (650nm) with a clearly visible beam spot for easy alignment and setup. The 2-meter pre-wired cable (PVC oil-resistant) provides flexible installation options.
E3T-ST12 2M Applications
The E3T-ST12 2M is ideally suited for a wide range of precision detection applications, including:
Semiconductor Wafer Tray Positioning：The ultra-thin profile of the E3T-ST12 2M allows installation in tight spaces of wafer handling robots for non-contact detection of wafer tray positioning, preventing wafer damage.
Blister Pack Jam Detection：The E3T-ST12 2M monitors conveyor transition zones in high-speed pharmaceutical packaging lines for jammed blister packs. The 1ms fast response and IP67 rating resist periodic washdowns.
Micro-Assembly Robotic Gripper Sensing：The E3T-ST12 2M detects whether miniature components are successfully gripped in micro-assembly robot end-effectors. The lightweight design and flexible 2m cable integrate seamlessly into gripper mechanisms.
Electronics Manufacturing：Detects the presence of circuit boards, connectors, and other miniature components for precise assembly.
Packaging and Conveyor Lines：Detects objects passing through or arriving at position to trigger subsequent actions.
E3T-ST12 2M Key Advantages
Ultra-Thin Design for Space-Constrained Installation：At just 7mm thick, the E3T-ST12 2M is one of the thinnest photoelectric sensors available, fitting where traditional sensors cannot.
Built-In Amplifier, No External Processing Unit Needed：The built-in amplifier of the E3T-ST12 2M outputs switching signals directly, eliminating the need for separate amplifier units and reducing system complexity and cost.
1m Long Sensing Distance for Flexible Applications：The 1m detection range accommodates both short and medium-distance detection requirements, from miniature component positioning to conveyor object detection.
IP67 Protection for Harsh Environments：The E3T-ST12 2M is fully dust-tight and resistant to temporary immersion, ensuring reliable performance in washdown-prone applications like pharmaceutical packaging and food processing.
1ms Fast Response for High-Speed Lines：The E3T-ST12 2M's response time under 1ms keeps pace with high-speed automation, ensuring no missed detections on fast-moving production lines.
Omron Original Quality for Long-Term Stability：As a global leader in industrial automation, Omron photoelectric sensors like the E3T-ST12 2M are renowned for high reliability and long service life. The PBT housing and oil-resistant cable ensure stable operation in harsh industrial environments.
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FAQ
1. What is E3T-ST12 2M？
The E3T-ST12 2M is an ultra-compact, ultra-thin through-beam photoelectric sensor with a built-in amplifier from OMRON. It consists of a transmitter and a receiver pair, detecting objects by sensing whether the light beam from the transmitter is blocked.
2. What are the key specifications of E3T-ST12 2M？
Key specifications of the E3T-ST12 2M include:
Sensing Method: Through-beam
Sensing Distance: 1m
Output Type: NPN open-collector output
Operation Mode: Dark-ON
Supply Voltage: DC 12V ~ 24V
Light Source: Red LED (650nm wavelength)
Response Time: < 1ms
Protection Rating: IP67
Connection: 2-meter pre-wired cable
Body Dimensions: 9.5 × 7 × 18.5mm
3. What package and material does E3T-ST12 2M use？
The E3T-ST12 2M features an ultra-thin, flat profile with extremely compact dimensions. The housing is made of PBT (Polybutylene Terephthalate) , and the lens is made of denatured polyarylate. The E3T-ST12 2M is rated IP67 for excellent dust and water resistance.
4. What applications is E3T-ST12 2M suitable for？
The E3T-ST12 2M is widely used in industrial automation for object detection:
Micro-object detection: Can detect opaque objects as small as φ2mm
Electronic component assembly: Detecting micro-components
Packaging machinery: Detecting labels and packaging materials
Automotive manufacturing: Component positioning and inspection
Quality inspection: Product defect detection and position verification
Logistics sorting: Item presence detection and counting
5. What development tools support E3T-ST12 2M？
As a standard industrial sensor, the E3T-ST12 2M does not require dedicated software tools. It can be directly connected to PLC (Programmable Logic Controller) input ports, relays, or other control circuits. The sensor features an operation indicator (orange) and a stability indicator (green) for easy on-site adjustment and operation verification.
6. What is the operating temperature range of E3T-ST12 2M？
The ambient operating temperature range of the E3T-ST12 2M is -25°C to 55°C. The storage temperature range is -40°C to 70°C.
7. What are the key features of E3T-ST12 2M？
Ultra-compact, ultra-thin design: The E3T-ST12 2M is ideal for tight spaces
IP67 protection rating: Dust and water resistant for harsh industrial environments
Long-distance through-beam sensing: Detection distance up to 1m
Built-in amplifier: No external amplifier required, simple wiring
Fast response: Response time < 1ms, suitable for high-speed detection
Comprehensive protection circuits: The E3T-ST12 2M features output short-circuit protection, output reverse polarity protection, power supply reverse polarity protection
8. What is the output mode of E3T-ST12 2M？
The output configuration of the E3T-ST12 2M is NPN Dark-ON. This means the output turns ON when the light beam between the emitter and receiver is blocked by an object, and turns OFF when the light path is clear.
9. What are the alternative models for E3T-ST12 2M？
Alternative models in the same series as the E3T-ST12 2M include:
E3T-ST13 2M: One of OMRON's officially recommended replacements
E3T-ST14 2M: Another through-beam alternative in the same series
E3Z-T81 2M: Through-beam sensor from a different OMRON series
E3T-ST12F 2M: Infrared light version
E3T-ST12-L 2M: Side-view version in the same series
10. What are the design considerations when using E3T-ST12 2M？
Through-beam characteristic: For the E3T-ST12 2M, the emitter and receiver must be used as a pair — ensure optical axis alignment during installation
Minimum detectable object: The E3T-ST12 2M can detect opaque objects as small as φ2mm
Mounting: Installed using M2 screws — mounting screws are included with the product
Ambient light interference: Avoid direct exposure of the E3T-ST12 2M's receiver to strong ambient light (incandescent lamp 5,000 lx max, sunlight 10,000 lx max)
Wiring: NPN output is 3-wire (Brown: V+, Blue: V-, Black: Signal output) — observe correct polarity when wiring