AM4205 Cubic R32 A2L Refrigerant Gas Sensor

AM4205 Cubic R32 A2L Refrigerant Gas Sensor
Regular price $99.00

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The AM4205 NDIR A2L Cubic Refrigerant Gas Sensor detects R32 gas for safety or alarms.

Using industry standard UART, in seconds the sensor begins reporting 0-50% LFL (Lower Flammability Limit, equal to LEL Lower Explosive Limit) in with high accuracy. Analog voltage output is also available.

R32 (difluoromethane) and R32-based refrigerant blends have been identified as the lead alternative refrigerant in the HVAC/R market. However, because R32-based refrigerant gases are mildly flammable per ISO 817:2014, they have an A2L classification that requires HVAC/R systems to incorporate a gas leak detection and mitigation system according to UL 60335-2-40 Edition 3 Annex GG & LL.


  • Non-dispersive infrared (NDIR) technology
  • Industry-standard serial UART or analog voltage outputs
  • Reference channel for self-compensation and long-term stability
  • No calibration required
  • Built-in temperature and humility compensation
  • Built-in heater for low-temperature operation to -30C
  • Fast response, no moving parts
  • > 15 year expected lifespan


  • Cold Chain and Storage
  • Commercial Air Conditioning
  • Automotive Air Conditioning


AM4205 Cubic Refrigerant Sensor - Measures R32 gas only.

R32 blends Refrigerant Sensors - R454A, R454B, R454C and R290 R32 blend gas sensors available by special order. Contact us for details.


  • Measuring Gas: R32
  • Sensing Method: Non-dispersive Infrared (NDIR)
  • Measurement Range: 0~50% LFL
  • Measurement Accuracy: ±3.75% LFL
  • Measurement Resolution: 1% LFL
  • Sampling Frequency: 1 sec
  • Response Time: T25 < 8 sec
  • Warmup Time: < 30 sec
  • Operating Temperature Range: -30~60°C (-22-140°F)
  • Storage Temperature: -30°~70°C (-22-158°F)
  • Operating Humidity Range: 0-95%RH (non-condensing)
  • Protection Level: IP54
  • Dimensions: 76.8x59.2x19mm (3.02x2.33x0.75 in.)
  • Power Requirements: 5VDC±0.1V, ripple wave < 50mV
  • Output: 3.3V Serial UART or 0.8-4V analog
  • Sensor Life Expectancy: > 15 years
  • Serial UART Output: 9,600, 8, N, 1
  • Footprint: 5 pins
  • Connector: TE 1-2141520-1 2mm


  • 90 Days. See CO2Meter Terms and Conditions.
  • Data Sheets

  • Manuals

  • Technical Documents

  • Videos

  • Additional Resources

  • Case Studies

Customer Reviews

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"Easy to install, easy to set up, and easy calibration - just what I was looking for."

- Phillip Farrar
Water Plant Superintendent

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