February 2026 – New UL Standard for Occupancy Sensors
UL (Underwriters Laboratories) has published UL 2680, the first dedicated safety standard for passive infrared (PIR) occupancy sensors used in life safety applications. The standard addresses reliability, false alarm immunity, and fail-safe operation.
Scope of UL 2680
The standard applies to PIR-based occupancy sensors used in:
- Security and intrusion detection systems
- Fire alarm systems (for occupant location)
- Emergency lighting control
- Healthcare monitoring systems
- Industrial safety systems
It does not apply to sensors used solely for energy management (lighting control, HVAC) unless they are also used for safety functions.
Key Requirements
Detection Reliability
- Sensors must detect a walking person at 90% of rated range under specified conditions
- Must detect a crawling person (simulating child or injured adult) at 50% of rated range
- Must detect slow movement (0.1 m/s) and fast movement (2 m/s)
- Performance must be verified across operating temperature range (-20°C to +60°C)
False Alarm Immunity
- Immunity tests for common false alarm sources:
- Sunlight and artificial light (including flicker)
- HVAC air currents
- Pets (up to 45kg)
- EMI/RFI from common sources
- Temperature transients (opening refrigerator, etc.)
- Maximum allowable false alarm rate: 1 per 30 days under specified test conditions
Fail-Safe Operation
- Sensors must fail in a known state (usually “occupied” or “alarm”)
- Self-diagnostic capability required (must detect sensor failure)
- Battery-powered sensors must provide low-battery warning at least 30 days before failure
- Wired sensors must withstand power interruptions and resume normal operation
Environmental Durability
- Temperature cycling tests (-20°C to +60°C, 100 cycles)
- Humidity exposure (95% RH, 40°C, 10 days)
- Vibration test (simulating transport and installation)
- Corrosion resistance for outdoor-rated sensors
Testing and Certification
Manufacturers seeking UL 2680 certification must:
- Submit samples to a UL-accredited laboratory
- Undergo all specified performance and immunity tests
- Provide documentation of design and manufacturing processes
- Undergo factory inspection for ongoing compliance
- Maintain certification through annual audits
Impact on Manufacturers
UL 2680 will significantly impact sensor design and testing:
- More rigorous testing will increase development costs
- Certification may take 6-12 months
- Existing sensors may need redesign to meet new requirements
- Compliant sensors can claim UL 2680 listing, a competitive advantage
Impact on Users and Specifiers
- Greater confidence in sensor reliability for safety applications
- Standardized performance claims enable easier comparison
- Reduced risk of false alarms in critical systems
- Insurance requirements may begin referencing UL 2680
Transition Period
UL has announced a 24-month transition period:
- Now: Standard published, certification available
- By March 2027: All new life safety installations must use UL 2680 certified sensors
- By March 2028: All existing life safety systems must be upgraded (where practical)
Industry Reaction
“This is a long-overdue standard,” said a security industry consultant. “Previously, occupancy sensors used in security systems were tested to various manufacturer-specific standards. UL 2680 levels the playing field and ensures that all certified sensors meet a baseline of reliability.”
Conclusion
UL 2680 represents a major step forward for the PIR sensor industry. For safety-critical applications, specifiers should look for UL 2680 certification as a mark of quality and reliability.