For HVAC/R systems using A3 refrigerants such as R290 (propane), compliance with UL 60335-2-40 and IEC/EN 60335-2-40 Annex LL makes reliable leak detection a critical safety requirement.

Although A3 refrigerants offer highly efficient energy transfer, their high flammability requires fast and dependable leak detection to protect occupants and equipment. Sensata leak detection systems are specifically optimized for A3 refrigerants, delivering fast response times, long operational lifetime, and low power consumption to help OEMs reduce maintenance needs and total system cost while supporting next-generation heat pumps and HVAC/R equipment.

Designed for real-world installations, Sensata A3 sensors operate reliably across wide temperature ranges and high-humidity environments, ensuring consistent performance in both indoor and outdoor applications. Flexible interfaces and output options enable easy integration into OEM control architectures, safety systems, and controllers.

In addition to meeting UL requirements, these sensors are approved for use in explosive atmospheres under the ATEX Directive and carry CE marking, providing a single, globally compliant solution for both North American and European markets.