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As the global automotive industry accelerates the transition toward sustainability, refrigerants used in vehicle HVAC systems are undergoing a critical transformation. Driven by stringent environmental regulations and carbon neutrality goals, traditional high-GWP refrigerants such as R-134a are being rapidly phased out in favor of eco-friendly alternatives including R744 (CO2), R290 (propane) , and other emerging low-GWP solutions. In line with this trend, an increasing number of new-generation electric passenger vehicles are adopting CO2-based refrigerant systems as part of their long-term platform strategies, while several manufacturers have also initiated early development and evaluation of R290-based HVAC systems. At the same time, supportive policies and incentives in regions such as Europe are further encouraging the adoption of low-GWP refrigerants in passenger vehicle HVAC systems. The evolution is reinforced by regulatory mandates such as EU Regulation 2024/573, which requires the progressive reduction of fluorinated greenhouse gas emissions by enforcing tighter leak detection standards. In addition, the adoption of new generation refrigerants introduces new challenges—not only in terms of system redesign, but also in ensuring leak safety for refrigerants such as R744 and R290 that carry specific risks. Therefore, the evolution makes the demand for accurate, application-specific gas sensing technologies becoming increasingly critical.
In response to the industry evolution, Cubic, as an automotive Tier 1 supplier, has developed the automotive refrigerant leakage sensing solution based on advanced NDIR technology, including two in-vehicle sensors: the Automotive Dual Function R744 Refrigerant Leakage Monitoring Sensor ACDS-1009 and the Automotive R290 Refrigerant Leakage Monitoring Sensor AM4206. Other than the in-vehicle sensors, Cubic also provides OEM Portable NDIR Refrigerant Gas Leak Detector AM4209 to support efficient service and maintenance operations.
According to existing analysis, R744 (CO2) poses several potential risks when used as refrigerant in vehicle HVAC systems. Due to high operating pressure, a leak can lead to mechanical stress or failure of system components. Additionally, CO2 is heavier than air and can accumulate in enclosed cabin spaces, displacing oxygen and creating an asphyxiation hazard for passengers. Leaks can also result in dry ice formation under certain conditions, leading to blockages or system damage. Given the risks, vehicle HVAC systems require not only real-time refrigerant leak detection but also continuous monitoring to ensure mechanical integrity and passenger safety. Driven by the requirements, Cubic ACDS-1009 is an NDIR high-performance dual-function gas sensor specifically designed for automotive applications, offering precise monitoring of in-cabin CO2 concentration and reliable detection of R744 refrigerant leakage. The sensor simultaneously enables precise CO2 concentration monitoring to support intelligent ventilation control and ensures early detection of R744 refrigerant leakage, enhancing overall safety in vehicle HVAC systems. Developed in accordance with the IATF 16949 automotive quality management standard, ensuring high standards of reliability and manufacturing consistency.
Compared with R744, R290 (propane) poses a different set of risks when used in vehicle HVAC systems. As a hydrocarbon refrigerant, R290 is highly flammable even at low concentrations, and a leak in an enclosed or poorly ventilated area can lead to the accumulation of combustible gas, creating potential fire or explosion hazards. Therefore reliable detection is especially crucial during both operation and maintenance. In response to the safety demands, based on NDIR technology, Cubic AM4206 is developed for automotive R290 refrigerant leakage monitoring, which enables real-time detection and immediate alarm triggering via LIN communication, minimizing the risk of flammable gas accumulation. With a dual-beam design, the sensor delivers robust and high accuracy detection, as well as a wide measurement range up to 0~100% LEL. An optional built-in heater is available to prevent condensation and frost, ensuring stable performance in varying environments.
While in-vehicle sensors enable continuous real-time monitoring during operation, portable detectors are essential for quickly identifying the presence and location of refrigerant leaks during system installation, maintenance, troubleshooting, and routine inspections. To meet the field-based diagnostic demand, portable solutions must combine high sensitivity, user-friendly interface, and adaptability across refrigerant types. Accordingly, Cubic has developed the AM4209 — an OEM portable gas leak detector based on NDIR technology — for detecting multiple types of refrigerants in service and maintenance operations. The AM4209 can be customized to detect various HFCs, HFOs, and blended refrigerants, including R32, R290, R410A, R134a, R454A, R454B, R454C, R1234ze, and R1234yf. Engineered for field precision, the detector offers ppm-level detection sensitivity, fast response, and robust anti-interference capability, ensuring accurate leak identification even in complex working environments. The AM4209 also features a TFT LCD screen that clearly displays quantitative, real-time leakage information, along with multiple alert indicators including loud beeper and red LED flashes at the tip. Furthermore, its strong anti-interference design and built-in high-capacity lithium battery support a long operational life of up to 10 years.
Designed for automotive excellence, Cubic refrigerant sensors are built to meet AEC-Q100 standards for automotive electronics and the IATF 16949 standards for automotive quality management, comply with EMC requirements across various vehicle platforms, and are backed by ASPICE-aligned software development capabilities. The strengths ensure the sensors not only deliver reliable performance but also integrate seamlessly into evolving automotive HVAC systems.
With the automotive industry embracing next-generation refrigerants while tightening safety requirements, the demand for reliable, real-time refrigerant leak detection has become more critical than ever. Backed by strong capabilities in the independent R&D of automotive-grade components and extensive expertise in refrigerant sensing technologies, Cubic provides comprehensive refrigerant leakage sensing solutions that empower automotive manufacturers to meet evolving environmental regulations while safeguarding passenger experience.
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