A2L and A3 Refrigerant Gas Sensor Module

Product
A2L and A3 Refrigerant Gas Sensor Module

UL / IEC certification status

R32 / IEC60335-2-40 Ed.7 ANNEX LL

Passed
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

Passed

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
Image
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.

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.

Sensitivity dependance of gas sensor
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 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
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.

Sensor Module Diagram
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

Module with moisture-proof case