A2L and A3 Refrigerant
Gas Sensor Module

Highly sensitive and durable semiconductor sensor is incorporated.
It can detect major refrigerants such as R32, R454B, and R290.

Refrigerant sensor for leak detection
  • A2L, A3 Refrigerant
    Gases detectable
    Liner response to the refrigerants concentrations of 1,000 - 10,000 ppm.
  • Long lifetime
    Our semiconductor type sensors are durable and sensitive. And their life time is 15 years.
  • Preventing
    false detection
    Internal filters minimize the bad influence by miscellaneous gases.
  • Easy Integration
    Small and lightweight.
  • Water Resistant Design
    Our module has passed the environmental durability test under high humidity.

Gas sensor modules for refrigerant leak detection

  FIS5084-01NC FIS5084-01C1
without housing with housing
Gas Sensor Semiconductor Type
Taget Gas R32, R454B, R1234yf, etc.
Gas Concentration Range 1,000~10,000ppm
Operation Temperature -25 ~ 60℃(no dew condensation)
Supply Shortage DC 5.0V + / -4%
Power Consumption 40mA(max. 81mA)
Output UART、Open collector
Water Resistant Yes
Other target gases R290, R600, etc.

Product Features

Our refrigerant leak detection modules use semiconductor gas sensors. Our sensors currently satisfy the performance standards established by the Japan Refrigeration and Air Conditioning Industry Association [JRA4068:2021 (Performance 3)], as well as the internationally recognized IEC60335-2-40 Edition 6.0. Moreover, we are in the process of developing products that meet the IEC60335-2-40 Edition 7.0 and UL60335-2-40 Edition 4.0 standards.

  1. Target Gases
    Our sensors can detect A2L refrigerants including R32, R454B, and others, as well as A3 refrigerants such as R290 and R600. Our refrigerant sensors provide linear responses to refrigerant concentrations of 1,000 – 10,000 ppm, and also feature temperature compensation functions. Our modules maintain their sensitivity within an operating temperature range of -25℃ to +60℃. Sensitivity of the semiconductor gas sensors to various gases is presented in this log-log graph, which shows changes in sensor resistance (RS) values at different gas concentrations. As shown in the graph, sensor resistance decreases as refrigerant gas concentration increases.
  2. Superior Durability
    Semiconductor gas sensors make calibration unnecessary, and these modules can be used for up to 15 years without replacing the sensors. These sensors can accurately detect refrigerants even following hydrogen and methane gas exposure tests.
    Internal filters
  3. Internal filters minimize the effects of gas interference
    Internal filters reduce the effects caused by interfering gases, such as ethyl alcohol and silicon gas, which are present in the ambient environment where the sensors are used. This minimizes gas interference effects and allows for selective detection of refrigerants such as Freon replacements (HFCs).
    Internal filters
    Internal filters
  4. Easy Integration
    Our modules are pre-adjusted using a target gas (R32), so they are ready to be installed in other products without requiring time-consuming gas adjustment. These small, lightweight modules produce output signals that are easy to extract, allowing for convenient integration into various devices. They interface with air conditioning units via a connector, which provides superior ease of maintenance and makes regular replacement convenient.
  5. Water Resistant Design
    We offer modules with water resistant coating on substrate and passed environmental durability test under high humidity.These modules can be installed in refrigeration and air conditioning systems used in environments where condensation is likely, such as outdoor units and refrigerators
    Shousing for water resistant
Nissha FIS is also developing a sensor that complies with UL standards.

Nissha FIS is also developing a sensor that complies with UL standards.

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Introducing gas sensor application examples in various fields

Product category

  • Gas sensor
  • Gas sensor module
  • Gas detecting device
  • Gas measuring deivce

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