2025/10/11 871T-L5A18, Sales records with pictures and video
Direct answer: The 871T-L5A18 is an Allen‑Bradley photoelectric sensor engineered for reliable industrial object detection up to 2 meters, featuring adjustable sensitivity, PNP/NPN outputs, 10–30 V DC operation and IP67 protection.
871T-L5A18 Photoelectric Sensor — Product Overview
The 871T-L5A18 is part of the Allen‑Bradley family of photoelectric sensors designed for industrial automation applications where robust object detection and dependable performance in harsh environments are required. It uses an infrared light source to detect objects, supports both PNP and NPN output wiring, and is built to IP67 ingress protection for dust and water resistance. Typical uses include conveyor systems, packaging machinery, and robotic pick-and-place operations.
Image Gallery
871T-L5A18 — front view 
871T-L5A18 — side / connector detail 
871T-L5A18 — installed view 
871T-L5A18 — wiring and mounting options 
871T-L5A18 — threaded body and bracket
Key specifications
| Parameter | 871T-L5A18 | Typical comparable sensor (illustrative) |
|---|---|---|
| Type | Photoelectric sensor (infrared LED) | Photoelectric (visible/IR) |
| Maximum sensing range | Up to 2 m (object dependent) | 0.5–3 m (varies by model) |
| Output type | PNP / NPN selectable | PNP or NPN (model dependent) |
| Supply voltage | 10–30 V DC | 10–30 V DC |
| Response time | 1 ms | 1–5 ms |
| Protection class | IP67 | IP65–IP67 |
| Operating temperature | -25°C to +70°C | -20°C to +60°C |
| Sensitivity | Adjustable | Fixed or adjustable |
| Mounting | Bracket or threaded body | Bracket / threaded / flush |
| Hysteresis | Low | Low–medium |
Typical application scenarios
- Conveyor systems: Detects products for spacing, counting and positioning.
- Packaging machines: Verifies alignment and presence before sealing or boxing.
- Robotics & automation: Provides object detection for pick-and-place arms and feeders.
Installation & operational notes
- Confirm wiring polarity and choose PNP or NPN output wiring according to your controller/PLC input requirements.
- Adjust sensitivity during commissioning to prevent false triggers from background objects or ambient light.
- Although rated IP67, for prolonged outdoor exposure or direct spray/chemical environments provide additional housing or protective conduit.
- Mount using supplied bracket or the sensor's threaded body; secure to minimize vibration-induced misalignment.
FAQ
- What is the sensing method of the 871T-L5A18?
- It uses a photoelectric sensing method (infrared LED) to detect objects based on light interruption or reflection depending on mounting and configuration.
- Can it be used in outdoor applications?
- Yes — it can be used outdoors, but it is recommended to house or shield the sensor to protect against prolonged exposure to harsh weather, UV, or chemical spray despite its IP67 rating.
- What is the maximum sensing distance?
- The maximum sensing distance is approximately 2 meters, depending on object size, reflectivity, alignment and ambient conditions.
- How should I wire the sensor?
- Wire the sensor according to the manufacturer wiring diagram, selecting PNP or NPN output type that matches your PLC/IO card. Refer to Allen‑Bradley installation documentation for pinouts and recommended wiring practice.
- How do I reduce false triggers?
- Adjust sensitivity, verify mounting alignment, use shielding to block stray light and ensure the sensor faces the target perpendicular to the detection zone. If required, use mechanical stops or optical filters recommended by the manufacturer.
Information source: Information sourced from Allen‑Bradley product documentation and specification sheets.
Updated: 2025-10-25
External references & trust signals
- Rockwell Automation / Allen‑Bradley — official site (manufacturer and documentation hub)
- Allen‑Bradley product information and support
- Protection rating: IP67 (dust tight and protected against temporary immersion)
- Usage guidance: Follow Allen‑Bradley installation manuals and local electrical codes for wiring and mounting
