Long-range laser photoelectric sensor (905nm Class 3R)
✨Features
Wiring Diagram & Pin Definition
| Pin Number | Color | Function | Description |
| 1 | Brown | VCC | Positive Power Supply (9-30V DC) |
| 2 | Blue | GND | Negative Power Supply (0V) |
| 3 | black | NPN | NPN Output Signal |
| 4 | white | PNP | PNP Output Signal |
Product Introduction
This 50m Laser Distance Sensor is a high-performance switching sensor designed for industrial and logistical automation. Housed in a compact 48x32mm shell weighing only 22.5g, it is easily integrated into drones, AGVs (Automated Guided Vehicles), or height-restriction barriers.
The sensor operates using a Class 3R 905nm laser, providing a discrete sensing solution with a tight beam spot (8mm @ 2m). It offers dual NPN and PNP outputs for universal compatibility with PLC inputs. With a wide operating temperature of -20 C to +55 C and IP65 protection, it performs reliably in harsh manufacturing or semi-outdoor environments.
Size and Structure
Circuit diagram
| Parameter | Specification |
|---|---|
| Sensing Range (90% Reflectivity) | 0.05 ... 50 m (White Target) |
| Sensing Range (10% Reflectivity) | 0.05 ... 20 m (Black Target) |
| Measurement Frequency | 500 Hz |
| Repeat Accuracy | 1 mm |
| Absolute Accuracy | N/A (Switching Application) |
| Laser Wavelength | 905 nm (Invisible Infrared) |
| Laser Class | Class 3R |
| Field of View (Spot Size) | Diameter 8 mm @ 2m |
| Ambient Light Immunity | 100,000 Lux |
| Operating Voltage | 9 ... 30 VDC |
| Power Consumption | Average: 0.43 W |
| Current Consumption | Peak: 80 mA / Average: 18 mA |
| Output Interface | NPN / PNP |
| Connection | Cable 2m (4-core, 0.2mm PVC) |
| Housing Dimensions | 48 x 32 x 21 mm |
| Weight | 22.5 g (excluding cable) |
| Operating Temperature | -20 C ... +55 C |
| Protection Degree | IP65 |
| Customization | Cable length, Output protocol |
FAQ
Q：Why are there two different sensing ranges (50m vs 20m)?
A：Laser sensors rely on reflected light.
White objects (90% reflectivity) reflect most of the light back, allowing the sensor to "see" them up to 50 meters.
Black/Dark objects (10% reflectivity) absorb most of the light, reducing the effective range to 20 meters. You must account for the target color when planning your installation.
Q：What does "Class 3R" mean? Is it safe?
A：Class 3R lasers are stronger than standard Class 1 or 2 lasers.
Safety: You should avoid direct eye exposure. While accidental momentary exposure is usually not dangerous, deliberate staring into the beam can cause eye damage. Appropriate caution labels should be used on the machine.
Q：Does this sensor output the actual distance measurement (e.g., "15.4 meters")?
A：No, this specific model is configured with NPN/PNP switching outputs. It acts as a switch that triggers when an object is detected within a certain range. (Note: The spec mentions "Support output protocol customization," so a version with UART/RS232 data output might be available upon request).
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