M8 / M12 / M18 Laser Photoelectric Sensor (one Pair)
The M8 / M12 / M18 series laser through-beam sensors are high-precision, highly reliable photoelectric sensors featuring a 650 nm red laser source. They offer small spot size, high directivity, and strong anti-interference capability. Available in M8, M12, and M18 housing sizes with sensing ranges of 30 m, 50 m and 50 m respectively, they support NPN / PNP outputs and NO / NC configurations — suitable for various industrial automation applications.
Product Overview
The M8 / M12 / M18 series laser through-beam sensors are high-performance photoelectric switches built around a 650 nm red laser diode. Designed with a through-beam sensing mode, they feature small spot size, high collimation, and excellent resistance to ambient-light interference. Available in M8, M12, and M18 industrial housing standards with maximum sensing ranges of 30 m, 50 m, and 50 m respectively, they support both NPN and PNP output configurations with selectable normally open (NO) / normally closed (NC) operation — ideal for high-precision and high-stability industrial automation applications.
Application Scenarios
- Industrial automation: material detection on production lines, workpiece positioning, counting and sorting.
- Safety & security: area-intrusion detection, safety-door monitoring, light-curtain replacement in hazardous zones.
- Logistics & conveying: package detection, conveyor-jam monitoring, high-speed counting.
- Precision manufacturing: detection of micro components, edge positioning, tension control.
- Harsh environments: suitable for dusty, oily or vibrating conditions, with IP55 protection rating.
Working Principle
The laser through-beam sensor consists of a transmitter and a receiver. The transmitter emits a modulated red laser beam, which is received by a photodiode in the receiver. When the beam is interrupted by an object, the receiver's output state switches, triggering a control signal. The built-in synchronous demodulation circuit effectively suppresses ambient-light interference, enhancing signal-to-noise ratio and detection reliability.
Detailed Specifications — 3 Variants
| Parameter | M8 × 45 Model | M12 × 55 Model | M18 × 52 Model |
|---|---|---|---|
| Max. sensing distance | 30 m | 50 m | 50 m |
| Light source | 650 nm red laser, Class 2 | 650 nm red laser, Class 2 | 650 nm red laser, Class 2 |
| Spot size (at 3 m) | Std. Φ 2 mm (customizable) | Std. Φ 2 mm | Std. Φ 2 mm |
| Output configuration | NPN / PNP, NO / NC selectable | NPN / PNP, NO / NC selectable | NPN NO (others customizable) |
| Operating voltage | 10 – 30 V DC | 10 – 30 V DC | 10 – 30 V DC |
| No-load current | < 10 mA | < 10 mA | < 10 mA |
| Max. load current | 150 mA | 150 mA | 150 mA |
| Leakage current | < 0.01 mA | < 0.01 mA | < 0.01 mA |
| Voltage drop | < 1.5 V | < 1.5 V | < 1.5 V |
| Response frequency | 100 Hz | 100 Hz | 100 Hz |
| Response time | 5 ms | 5 ms | 5 ms |
| Switching hysteresis | < 15 % Sr | < 15 % Sr | < 15 % Sr |
| Repeat accuracy | < 5 % Sr | < 5 % Sr | < 5 % Sr |
| Protection rating | IP55 | IP55 | IP55 |
| Operating temperature | 0 °C to +55 °C | 0 °C to +55 °C | 0 °C to +55 °C |
| Short-circuit protection | Yes | Yes | Yes |
| Overcurrent protection | 180 mA | 180 mA | 180 mA |
| Connection | Φ 3.0 mm PVC cable | Φ 4.0 mm PVC cable | Φ 5.0 mm PVC cable |
| Cable specification | 3 × 0.15 mm² | 3 × 0.15 mm² | 3 × 0.33 mm² |
| Housing material | Nickel-plated brass | Nickel-plated brass | Nickel-plated brass |
| LED indicator | Tx: green · Rx: yellow | Tx: green · Rx: yellow | Tx: green · Rx: yellow |
| Beam alignment | Mechanical alignment lens | Mechanical alignment lens | Mechanical alignment lens |
| Certification | RoHS | CE · RoHS | CE · RoHS |
Safety Light Curtain — Customer Cases
Real installations from DAIDISIKE clients. Click any case to view in full. Filter by scenario to quickly find a similar setup.