A2L Refrigerant

NevadaNano’s Molecular Property Spectrometer™ (MPS™) A2L Refrigerant Gas Sensor provides accurate and reliable detection of mildly flammable (A2L) R-32, R-454b blends, R-1234yf and other low global warming refrigerant gases common in HVAC applications. With a 1O+ year calibration interval and lifetime, the MPS A2L Refrigerant Gas Sensor delivers industry-leading performance and the lowest total cost of ownership.

Operating Principle

The Molecular Property Spectrometer (MPS) A2L Refrigerant Gas Sensor’s transducer is a micro-machined membrane with an embedded Joule heater and resistance thermometer. The MEMS transducer is mounted onto a PCB and open to ambient air. Presence of a flammable refrigerant gas causes changes in the thermodynamic properties of the air/gas mixture that are measured by the transducer. Sensor data are processed by patent-pending algorithms to report an accurate concentration.

MPS™ A2L Refrigerant Sensor Features:

 

• Meets UL 60335-2-40 & ASHRAE 15 requirements
• Wide environmental operating range with no cross-sensitivity to rapid T & RH changes
• No false positives
• Extremely fast response time
• Immune to poisoning
• 10+ year calibration interval
• 10+ year lifetime
• Built-in self-test for fail-safe operation
• Industrial and residential packaging options
• Third-party tested
• Available now for integration

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Refrigerant Leak Detection

Refrigerant Regulations

Concerns over climate change are leading to new laws restricting the use of refrigerants common in air-conditioning systems. Emerging government regulations at the state, national, and international levels want to phase-out refrigerants with high Global Warming Potential (GWP). Such refrigerants are thousands of times more polluting than carbon dioxide.

These new regulations have emerged within the last year, with a short time window to achieve compliance. This poses a variety of challenges for residential and commercial HVAC equipment manufacturers. This is an issue because firstly, manufacturers are being mandated to develop new and environmentally friendly, Low Global Warming (LGW) refrigerants and cooling systems. Secondly, they must be able to react to and conduct refrigerant leak detection (per, e.g., ASHRAE Standard 15 and UL 60335-2-40) with refrigerant gas sensors. This is because next-generation refrigerants such as R32, R454b are flammable (ASHRAE safety classification 2L or A2L) at certain concentrations in the air.

Refrigerant leak detection with the refrigerant gas sensor is therefore a matter of both safety and environmental protection—one that has made refrigerant gas sensors a rapidly emerging global market.

Environmentally-Induced Refrigerant Leaks

The inner workings of an AC unit can experience wide humidity and temperature swings. Most of the sensors on the market today have difficulty maintaining effectiveness in such conditions for extended periods of time. Meanwhile, consumers have come to expect high reliability—the AC should “just work” all the time. Downtime due to faulty refrigerant gas sensors, requiring visits from technicians, is a non-starter. Of immediate need is a sensor developed by IoT infrastructure companies that are capable of dependable and accurate gas sensing in a harsh environment.

NevadaNano’s MPS™ A2L Refrigerant Gas Sensor has been configured to provide just what this emerging market needs: a robust, refrigerant-dedicated sensing solution like that can reliably recognize leaks over a long field life, in real-world environments, without frequent servicing.

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NevadaNano is the developer of the Molecular Property Spectrometer gas-sensing products that use Micro-Electro-Mechanical Systems (MEMS) structures to detect, identify, and quantify chemicals in the air.





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