A2L and A3 Refrigerant
Gas Sensor Module

Highly sensitive and durable semiconductor sensor is built in module.
It can detect refrigerant such as R32, R454B, and R290.

A2L and A3 Refrigerant Gas Sensor Module

UL / IEC certification status

  • R32 / IEC60335-2-40 Ed.7 ANNEX LL
  • R32 / UL60335-2-40 Ed.4 ANNEX LL
    Under testing (to be completed in Apr.2024)
  • R454B / UL60335-2-40 Ed.4 ANNEX LL
    Under Testing (to be completed in Mar. 2024)
  • R290 / IEC60335-2-40 Ed.7 ANNEX LL
  • A2L, A3 Refrigerant
    Gases detectable
    Linear response to the refrigerants concentrations of 1,000 - 10,000 ppm.
  • Long lifetime
    The semiconductor type sensors are durable and senstive with a lifetime of 15 years
  • Preventing
    false detection
    Internal filters minimize the bad influence of miscellaneous gases.
  • Easy Integration
    Small and lightweight.
  • Water Resistant Design
    The module has passed the environmental durability test under high humidity.

sensor modules for refrigerant leak detection specification.

  FIS5084-01NC FIS5084-01C1
Appearance without case with case
Gas Sensor SB type semiconductor gas sensor
Taget Gas R32
Gas Concentration Range 1.000~ 10,000ppm
Alarm Concentration R32 5,000ppm
Alarm Output Open collector
Operating and Short Temperature range -25~60℃(without dew condensation)
Power Supply 5.0V DC± 5%
Average Power Concentration 40mA
Dustproof & Waterproof Moisture-proof paint
Other Target Gasses※ R290,R454B,R1234yf,etc

※Specification to be changed as per type of refrigerant gas.

Product Features

The refrigerant leak detection modules use semiconductor gas sensors. The 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 7.0 Moreover, we are in the process of developing products that meet the UL60335-2-40 Edition 4.0 standards.

  1. Target Gases
    The sensors can detect A2L refrigerants including R32, R454B, and others, as well as A3 refrigerants such as R290 and R600. The refrigerant sensors provide linear responses to refrigerant concentrations of 1,000 – 10,000 ppm, and also feature temperature compensation functions. The 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
    The modules are pre-adjusted using a target gas (R32), so they are ready to be installed in other products without requiring time-consuming gas calibration. 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
    Module with moisture-proof case
Nissha FIS is also developing a sensor that complies with UL standards.

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

Click here

Introducing gas sensor application examples in various fields

Product category

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