MPS™ Refrigerant Gas Sensor
Precise and dependable detection of A1, A2L, and A3 propane refrigerant gases commonly used in HVAC & Refrigeration applications.
Why OEMs Choose the MPS™ Refrigerant Sensor
Low Maintenance, High Accuracy, and Robust Performance
- Highly accurate refrigerant gas detection
Resolution to 0.1% LFL and LEL with built-in environmental compensation for temperature, relative humidity, and pressure for near-zero false positives.
- No field calibration
Requires no field calibration for its 15-year operational life — eliminating recurring service costs in hard-to-access HVAC installations and reducing total cost of ownership for OEM instrument manufacturers.
- Wide operating range
-40°C to 75°C operating range with up to 100% relative humidity.
- Self-diagnostics capability
Performs a comprehensive sequence of self-checks every 2 seconds to ensure fail-safe operation.
- Certified as Intrinsically Safe
Class I, Div. 1 and Zone 0 rated, with global certifications (FM, CSA, ATEX, IECEx).
- UL Certification Compliance
Compliant with sensor requirements in UL60335‑2‑40, UL/IEC 60079‑29‑1, and UL/IEC 60335‑2‑40.
The MPS™ Refrigerant Gas Sensor Models
| Feature | MPS™ A1 Sensor | MPS™ A2L Sensor | MPS™ A3 Sensor |
|---|---|---|---|
| No required field calibration | |||
| Immune to poisoning | |||
| Immune to saturation | |||
| UART + Analog Out | |||
| 15-year sensor life | |||
| Power-On-Self-Test (POST) | |||
| Built-In-Self-Test (BIST) | |||
| Detects flammable gas during start-up | |||
| Gas Detected | R-410A |
R-32 R-454A R-454B R-454C R-1234ze |
R290 (Propane) |
| Applications |
Comfort Cooling Residential HVAC |
Residential HVAC Heat Pumps |
Commercial Refrigeration Residential HVAC Heat Pumps |
| Range |
Static Conditions: 1,700-130,000 ppm Dynamic Conditions: 5,100-130,000 ppm |
R-32: 5-100 %LFL R-454A 5-100 %LFL R-454B: 9-100 %LFL R-454C: 8-100 %LFL R-1234ze 9-100 %LFL |
5-100 %LEL |
| Resolution | 130 ppm | 0.1% LEL | 0.1% LEL |
| Certifications | N/A |
UL60335-2-40 (2022) Annex LL Compliant ATEX/IECEx Certified (S4 Only) |
UL/IEC 60079-29-1 Annex A Compliant UL/IEC60335-2-40 (2022) Compliant ATEX/IECEx Certified (S4 Only) |
| Power consumption | 29mW | 29mW | 27.3 mW |
| Lowest Supply voltage | 3.3 - 5.0 ±5% VDC | 3.3 - 5.0 ±5% VDC | 3.0 - 5.0 ±5% VDC |
The MPS™ Comes in Two Form Factors
S4
Mini
Validated A2L Refrigerant Sensor Performance
Multiple parties have completed performance testing of NevadaNano’s HVAC-R sensors. This includes extensive testing at NevadaNano, thorough evaluation by our customers, and evaluation by the Air-Conditioning, Heating and Refrigeration Technology Institute (AHRTI), a product test lab that serves over 300 HVAC-R manufacturers. NevadaNano’s sensor was the only sensor of eleven sensors evaluated by AHRTI that met all the test criteria required for detecting A2L refrigerant leaks. In all, AHRTI evaluated twenty-eight criteria, evaluating the sensor against the following specs:
- IEC 60335-2-40 (International Electrotechnical Commission).
- UL/CSA 60335-2-40 (Underwriters Lab and Canadian Standards Association).
- ASHRAE 15 (American Society of Heating, Refrigerating and Air-Conditioning Engineers).
- JRA Standard 4068T (Japan Refrigeration and Air Conditioning Industry Association).
A1, A2L, and Propane Refrigerant Detection Applications
The MPS™ is the OEM sensor of choice for HVAC refrigerant leak detectors and leak detection systems across residential, commercial, and industrial applications. From comfort cooling and heat pumps to cold chain refrigeration and data center cooling, the MPS™ delivers reliable A2L and A3 refrigerant leak detection with calibration-free sensor technology.
HVAC-R
- Residential Air Conditioning – all types
- Commercial Air Conditioning
- Industrial Air conditioning
- Data Center cooling
- Server farm cooling
- Hospitals and health care
- Educational Institutions
- Grocery / Food Retail
Heat Pumps and VRF/VRV Air Conditioning
- Commericial and Residential Air Conditioning
- Offices
- Multi Residency Residential Units
- Care Homes
- Public Buildings
- Hotels
Refrigeration / Cold Chain
- Food Production and Processing
- Cold Storage
- Pharmaceutical Units
- Data Centers
- Process Cooling Supermarket Display Cases – Food Retail
- Vending Machines
PROPANE LEAK DETECTION
Why Propane is Becoming the Refrigerant of Choice
The MPS™ A3 Sensor is used for industrial propane leak detection. Learn about the rise of R-290 as a sustainable refrigerant and why leading manufacturers like Mitsubishi, Samsung, and LG are making the switch.
Frequently Asked Questions About the MPS™ Refrigerant Sensor
What refrigerants does the MPS™ Refrigerant Gas Sensor detect?
The MPS™ Refrigerant Gas Sensor detects A1, A2L, and A3 refrigerants each from a single sensor platform. A1 refrigerants include R-410A. A2L refrigerants include R-32, R-454A, R-454B, R-454C, and R-1234ze. A3 refrigerants include R-290 propane. Each refrigerant class is detected by a dedicated MPS™ sensor model.
Does the MPS™ Refrigerant Gas Sensor require field calibration?
No. The MPS™ Refrigerant Sensor requires no field calibration for its entire 15-year operational life. This eliminates recurring calibration costs and service visits — particularly valuable for HVAC OEMs deploying sensors in residential and commercial installations where field access is difficult or expensive.
What is the difference between A1, A2L, and A3 refrigerants?
Refrigerant safety classifications are defined by ASHRAE Standard 34. A1 refrigerants are non-flammable. A2L refrigerants are mildly flammable with a low burning velocity — this category includes newer low-GWP refrigerants like R-32 and R-454B that are replacing R-410A globally. A3 refrigerants are highly flammable — this category includes natural refrigerants like R-290 propane, which is widely used in commercial refrigeration for its near-zero GWP.
Is there any independent testing of the MPS™ Refrigerant Sensor performance?
In independent testing conducted by the Air-Conditioning, Heating and Refrigeration Technology Institute (AHRTI), NevadaNano’s MPS™ sensor was the only sensor of eleven evaluated to meet all 28 test criteria for A2L refrigerant leak detection. Testing was conducted against IEC 60335-2-40, UL/CSA 60335-2-40, ASHRAE 15, and JRA Standard 4068T.
Is the MPS™ Refrigerant Gas Sensor certified for use with flammable A2L and A3 refrigerants?
Yes. The MPS™ A2L Sensor is compliant with UL60335-2-40 (2022) Annex LL and ATEX/IECEx certified. The MPS™ A3 Sensor is compliant with UL/IEC 60079-29-1 Annex A, UL/IEC 60335-2-40 (2022), and ATEX/IECEx certified — meeting the requirements for detecting flammable refrigerants in hazardous locations.
What is the operating range of the MPS™ Refrigerant Gas Sensor?
The MPS™ Refrigerant Gas Sensor operates across -40°C to 75°C with up to 100% relative humidity, with built-in compensation for temperature, pressure, and humidity. This makes it suitable for outdoor HVAC installations, cold storage environments, and other demanding conditions where temperature and humidity extremes are common.