A2L Leak Detection for HVAC Systems
TE Connectivity’s (TE) A2L refrigerant sensor module is designed to meet all UL and CSA 60335-2-40 Annex LL requirements, supporting leak hazard mitigation without the need for field calibration. The module uses thermal conductivity sensing technology to detect R-454B and R-32 gases at 10% lower flammability limit (LFL) with ±2.5% accuracy and a 15-second response time. With integrated temperature and humidity sensors for environmental compensation, the module can operate at temperatures ranging from -40°C to +95°C and up to 100% relative humidity. The sensor is resistant to poisoning by typical interference gases and uses automated self-calibration (ASC) to maintain performance for up to 15 years without recalibration.
Product Features
UL 60335-2-40 Compliant A2L Refrigerant Sensor for R-454B & R-32 Leak Detection
| Gas Type (s) |
R-32, R-454B | Operating Temperature (°C) |
-40°C to +95°C |
| Max Current Rating |
100 (mA) | Detection Range |
0%-100% Lower Flammability Limit |
| Voltage Rating | 5V - 17V DC | Detection Threshold | 10% Lower Flammability Limit |
| Communication | RS485 Modbus RTU | Detection Accuracy | ±2.5% Lower Flammability Limit |
| Agency Approvals | UL & CSA | Sealed Version | IP54 |
Key Features
A2L Leak Detection
- Thermal conductivity gas sensor with temperature and humidity compensation
- Locking connector interface supporting customized harnessing (optional IP67 connection)
- Easy installation with compact enclosure design and multiple mounting bracket options
- Enclosed module meeting IP54 and salt spray corrosion testing standards
- Integrated anti-condensation heater
- ETL certified to meet UL and CSA 60335-2-40 Annex LL standards
- RS485 Modbus RTU communication protocol with Pulse Width Modulation (PWM) or Universal Asynchronous Receiver-Transmitter (UART) options
Frequently Asked Question (FAQs)
A2L Refrigerant Sensor
Reliable A2L Gas Detection
What HVAC systems need refrigerant leak detection for regulatory compliance?
HVAC equipment using low-GWP (low-global warming potential) A2L or A3 refrigerants may require leak detection system to meet safety regulation. TE Connectivity's A2L refrigerant sensor is designed to help meet or exceed UL & CSA 60335-2-40 Annex LL requirements, helping manufactuers comply with leak mitigation standards. As of January 1, 2025, the U.S. Environmental Protection Agency (EPA) mandates the transition to low-GWP refrigerants for most new HVAC systems, making compliant leak detection essential.
What certifications are required for A2L refrigerant leak detection sensors?
A2L refrigerant leak detection sensors must comply with UL/CSA 60335-2-40, the primary safety standard for HVAC equipment in North America. TE's A2L gas sensor is ETL-certified to meet UL and CSA 60335-2-40 Annex LL requirements. The latest Edition 8 (December 2024) includes stricter safety rules for systems using low-GWP A2L refrigerants which, TE’s A2L gas sensor meets.
Which refrigerants need to be detected in modern HVAC systems?
Most new HVAC systems in North America use A2L refrigerants, primarily R-454-B and R-32. TE's A2L gas sensor is designed to detect these gases at 10% of the Lower Flammability Limit (LFL) with ±2.5% accuracy and 15-second response time. These refrigerants replace R-410A due to their lower environmental impact and improved efficiency.
