Last Updated: 2026-04
Author: Kim Myung-Joong (CEO, Fresnel Factory / IEC & ISO Sensor Standards Expert)
Reading time: ~6 minutes
Quick Answer
Quick Answer:
- EN 50131-2-2 is designed for security (intrusion detection)
- IEC 63180 is designed for occupancy detection and automation
- EN 50131 focuses on detecting movement events with low false alarms
- IEC 63180 focuses on detecting presence continuously (including stationary humans)
- Lens design, detection zone segmentation, and sensitivity tuning differ significantly depending on the target standard
Why is it important to distinguish EN 50131-2-2 and IEC 63180?
For hardware engineers designing PIR or next-generation sensors (such as TMOS), selecting the correct standard is not optional—it directly defines:
- Detection algorithm behavior
- Optical lens structure (Fresnel segmentation)
- Sensitivity distribution across distance
- False alarm filtering strategy
A sensor optimized for EN 50131 may fail user experience tests in IEC 63180 environments, and vice versa.
What does EN 50131-2-2 actually evaluate?
EN 50131-2-2 is a security-grade performance standard for PIR motion detectors.
Key evaluation focus:
- Human intrusion detection (walking target)
- Detection reliability across defined zones
- False alarm immunity:
- Airflow disturbances
- Temperature drift
- Small animals (depending on grade)
- Environmental robustness:
- Temperature range typically from −10°C to +55°C
- Electrical interference resistance
Detection philosophy:
- Detect motion crossing zones
- Ignore non-critical environmental signals
- Prioritize alarm certainty over sensitivity
What does IEC 63180 evaluate differently?
IEC 63180 addresses presence and motion sensing in real environments, especially for:
- Lighting control
- HVAC systems
- Smart buildings
Key evaluation focus:
- Detection range (e.g., 3 m, 5 m, 8 m typical indoor scenarios)
- Field of view (often 90°–120° depending on application)
- Response time (seconds-level)
- Ability to detect stationary humans
Detection philosophy:
- Detect presence over time
- Maintain detection even with minimal movement
- Avoid user discomfort (e.g., lights turning off unintentionally)
How do sensor design requirements differ?
| Design Element | EN 50131-2-2 | IEC 63180 |
|---|---|---|
| Detection target | Moving intruder | Moving + stationary human |
| Sensitivity | Moderate (controlled) | High (continuous detection) |
| False alarm tolerance | Very low | Moderate |
| Detection zones | Segmented, discrete | Overlapping, dense |
| Lens design | Sharp zone boundaries | Smooth, wide coverage |
| Typical use | Security systems | Smart lighting, HVAC |
Why does Fresnel lens design change depending on the standard?
At Fresnel Factory, the optical structure of the lens is one of the most critical parameters in meeting either standard.
For EN 50131-2-2:
- Distinct Fresnel zones are required
- Zone spacing defines detection events
- Typical design includes:
- Alternating hot/cold zones
- Long-range zones up to 10–15 m [application dependent]
- Goal: maximize motion contrast signal
For IEC 63180:
- Denser and smoother zone distribution
- Increased overlap to maintain detection
- Enhanced sensitivity for micro-movements
- Goal: maintain continuous presence signal
This is not just a firmware difference—the lens geometry itself must change.
Real-world application: Why both standards are used together
In many systems, both standards coexist:
- Security mode (night): EN 50131-based detection
- Occupancy mode (day): IEC 63180-based detection
This creates demand for:
- Dual-mode sensors
- Hybrid optical designs
- Adaptive sensitivity control
Fresnel Factory supports such applications through:
- Custom lens segmentation design
- Optical simulation (CODE V, LightTools)
- Application-specific tuning for PIR and TMOS sensors
Frequently Asked Questions (FAQ)
Q1. Can one sensor meet both EN 50131-2-2 and IEC 63180?
Yes, but it requires careful tuning of both optics and signal processing. In many cases, trade-offs are unavoidable.
Q2. Why is stationary detection difficult for PIR sensors?
PIR sensors detect infrared change, not absolute temperature. Without motion, signal variation is minimal.
Q3. Is Fresnel lens design more important than sensor IC?
For PIR systems, the lens often defines over 50% of detection performance, especially zone geometry.
Q4. What detection distance should I design for?
Typical ranges:
- Indoor PIR: 5–12 m
- Ceiling mount occupancy: 3–8 m
Exact values depend on lens focal length and segmentation.
Q5. How does TMOS change this comparison?
TMOS sensors can detect absolute IR levels, improving stationary detection—making them more aligned with IEC 63180.
About the Author
This article is written by Kim Myung-Joong, CEO of Fresnel Factory.
He is actively working as an expert in international standardization activities within IEC and ISO, focusing on sensor performance evaluation and next-generation detection technologies.
LinkedIn:
https://www.linkedin.com/in/ashton-myung-kim-44b31032/
Next Step
If you are designing a PIR or TMOS-based sensing system and need support in:
- Lens selection
- Detection zone optimization
- Custom optical design
You can request support directly through Fresnel Factory or explore available products via DigiKey.