R32 Refrigerant Leak Sensor Modules for HVAC OEMs
Compare Winsen R32 gas sensor options for air conditioners, heat pumps, VRF systems and refrigeration equipment. Choose NDIR modules for quantitative %LFL monitoring or a calibrated semiconductor module for a fixed ppm alarm strategy.
MH-Z1542B · Compact UART Sensor
ZP201 · 5000 ppm Alarm ModuleR32 Leak Detection Supports Safer A2L HVAC System Design
R32 is widely used in modern air-conditioning and heat-pump equipment. It is classified as an A2L refrigerant, meaning lower toxicity with mild flammability. A leak detection system can help the appliance controller initiate mitigation actions such as air circulation, equipment shutdown, valve control or a fault indication when the validated threshold is reached.
The required sensor range, threshold and response logic depend on the final appliance, refrigerant charge, installation environment and applicable safety standard. For this reason, an R32 sensor should be selected as part of the complete refrigerant detection system rather than as an isolated component.
Choose the R32 Sensor Architecture Before Choosing the Model
The most suitable sensor is determined by what the final controller needs to do after a leak is detected.
Integrated A2L Safety Control
For HVAC equipment that needs measured %LFL data, diagnostic communication and controller-driven mitigation.
- NDIR measurement module
- RS485 or UART communication
- Temperature compensation
- Suitable for appliance RDS development
Compact Embedded Monitoring
For products where board space and simple digital integration are major design constraints.
- Small NDIR sensor package
- UART concentration output
- 0–5.00% Vol option
- Suitable for compact controllers
Fixed ppm Leak Alarm
For cost-sensitive equipment requiring a factory-calibrated module with a defined R32 alarm point.
- Semiconductor sensing module
- 5000 ppm alarm point
- PWM and TTL output
- Compact 5 V integration
Compare Winsen R32 Refrigerant Leak Sensors
The following options cover appliance-level RDS integration, compact infrared concentration measurement and fixed ppm leak alarms.
ZRT512E
R32 and R454B detection module for HVAC, refrigeration and heat-pump systems requiring RS485 communication.
- Faixa de detecção: 0–100% LFL
- Resolução: 0,1% LFL
- Protocolo RS485
- R32 alarm point listed as 7% LFL
- Tempo de resposta: ≤15 segundos
- Dimensions: 54.0 × 49.1 × 17.9 mm
ZRT510-R32
Dedicated R32 module for equipment requiring 5 V power, industrial communication and long service life.
- Faixa de detecção: 0–50% LFL
- RS485; UART or PWM customizable
- Working voltage: 5 ± 0.2 V DC
- Warm-up time: under 30 seconds
- Temperatura de trabalho: −40 a 85°C
- Life span: over 15 years
ZRT512C Series
Compact R32, R454B and R290 module family with RS485/UART output and optional PWM customization.
- Faixa de detecção: 0–50% LFL
- Resolução: 0,1% LFL
- R32 response time: under 10 seconds
- Working voltage listed: 3.6–5.5 V DC
- Temperatura de trabalho: −40 a 85°C
- Size: 54 × 34.9 × 28.83 mm
ZRT512J
NDIR module for fixed equipment and industrial control panels that need 24 V supply and relay control.
- Faixa de detecção: 0–50% LFL
- RS485/UART; PWM customizable
- Controle de relé suportado
- Working voltage: 24 ± 1 V DC
- R32 response time: under 10 seconds
- Life span: over 15 years
MH-Z1542B-R32
Compact infrared sensor for embedded R32 concentration measurement where board space is limited.
- Detection range: 0–5.00% Vol
- UART output
- Working voltage: 3.6–5 V DC
- T25 response time: under 7 seconds
- Dimensions: 32.9 × 22.3 × 11.9 mm
- Life span: over 15 years
ZP201
Factory-calibrated module for air-conditioning and refrigeration systems requiring a compact fixed R32 alarm point.
- Alarm point: 5000 ppm
- PWM and TTL output
- Working voltage: 5.0 ± 0.2 V DC
- Working current: ≤80 mA
- Warm-up time: ≤3 minutes
- Dimensions: 25 × 34 × 14.1 mm
| Modelo | Princípio | Range / Alarm | Saída | Poder | Recommended Design Role |
|---|---|---|---|---|---|
| ZRT512E | É n | 0–100% lfl | RS485 | 5 ± 0.5 V DC | R32/R454B appliance RDS requiring broad %LFL measurement |
| ZRT510-R32 | É n | 0–50% LFL | RS485; UART/PWM customizable | 5 ± 0.2 V DC | Dedicated R32 HVAC and heat-pump integration |
| ZRT512C Series | É n | 0–50% LFL | RS485/UART; PWM customizable | 3.6–5.5 V DC listed | Compact multi-refrigerant controller platforms |
| ZRT512J | É n | 0–50% LFL | RS485/UART + relay | 24 ± 1 V DC | Fixed detectors, control cabinets and relay-driven mitigation |
| MH-Z1542B-R32 | É n | 0–5.00% Vol | Uart | 3.6–5 V DC | Compact embedded concentration measurement |
| ZP201 | Semiconductor module | 5000 ppm alarm point | PWM + TTL | 5.0 ± 0.2 V DC | Cost-sensitive fixed alarm applications |
Specifications are reproduced from current Winsen product information. Product documents can be revised; confirm the latest datasheet, exact model suffix, certification scope and application conditions before design approval.
R32 Sensor Integration Across HVAC Equipment
Select the sensor after reviewing refrigerant charge, possible leak paths, airflow, enclosure geometry, condensation risk and controller interface.
Air Conditioners
Embedded R32 monitoring for split, packaged and room air-conditioning systems.
HVAC solution →Bombas de calor
Leak detection for residential and commercial heat-pump indoor and outdoor units.
Heat-pump guide →VRF Systems
Multi-zone systems requiring dependable sensor communication and coordinated mitigation logic.
Discuss VRF integration →Chillers & Rooftop Units
Equipment-level detection with RS485, relay control or connected building management functions.
Get model advice →Design the Complete Refrigerant Detection System, Not Only the Sensor
The sensor, enclosure, location, power supply, software and mitigation response must operate as one validated system.
Sensor Location
Place the sensing inlet where a representative leak can reach it within the required response time. Validate location using the final equipment geometry and airflow.
Condensation Control
Avoid liquid water entering the sensing path. Review evaporator proximity, drain paths, icing, moisture recovery and mounting direction.
Controller Logic
Define signal plausibility, sensor fault response, alarm debounce, communication timeout, fan control and equipment shutdown behavior.
Whole-System Validation
Verify response with realistic leak locations, operating modes, airflow conditions, temperature, humidity and expected interfering substances.
R32 Sensor Selection for UL / IEC 60335-2-40 Projects
Applicable equipment standards can require an integrated refrigerant detection system depending on the appliance design, refrigerant charge and occupied-space conditions. The final appliance—not the sensor alone—must satisfy the applicable requirements.
What the OEM Should Define
- Target refrigerant and model-specific detection threshold
- Maximum permitted response time and mitigation sequence
- Required sensor self-monitoring and fault handling
- Environmental and interfering-gas test conditions
- Production calibration, traceability and end-of-line test
What Winsen Can Support
- R32 model selection based on range, supply and interface
- Datasheet, communication protocol and sample evaluation
- RS485, UART, PWM and relay-oriented integration options
- Custom model discussion for qualified volume projects
- Technical review before prototype and validation testing
NDIR vs. Semiconductor R32 Leak Sensor
NDIR is typically selected when the controller needs quantitative refrigerant concentration, while a semiconductor module can be appropriate for a defined leak alarm and cost-sensitive architecture.
| Fator de seleção | NDIR R32 Module | Semiconductor R32 Module |
|---|---|---|
| Primary output | Measured concentration in %LFL or %Vol | Fixed alarm or sensing response converted by module electronics |
| Seletividade | Uses infrared absorption characteristics of the configured refrigerant | Broader gas response; interference validation remains important |
| Typical interface | RS485, UART, PWM or relay depending on module | PWM and TTL on ZP201 |
| Integration workload | Conditioned module output and digital communication options | Simple fixed-alarm integration, but whole-system threshold verification is still required |
| Typical use | A2L safety control, HVAC OEM systems and connected controllers | Cost-sensitive air-conditioning and refrigeration leak alarms |
| Example Winsen models | ZRT512E, ZRT510-R32, ZRT512C, ZRT512J, MH-Z1542B | ZP201 |
Read more: Sensor de refrigerante NDIR vs MOS para detecção A2L.
From R32 Sensor Selection to Equipment Validation
Share Requirements
Provide appliance type, refrigerant, charge, target market, power supply, output and expected annual volume.
Select Candidate Models
Compare range, response, package, interface, environmental limits and standards documentation.
Prototype & Integrate
Review placement, airflow, power integrity, communication, fault handling and mechanical protection.
Validate the Appliance
Test realistic leaks and operating conditions, then complete certification and production verification.
R32 Refrigerant Sensor FAQ
What type of sensor is used to detect R32 refrigerant?
R32 can be detected using NDIR infrared modules or semiconductor sensing modules. NDIR products are generally selected for quantitative %LFL or %Vol output, while a semiconductor module such as ZP201 can provide a fixed ppm alarm strategy.
Which Winsen R32 sensor is suitable for an air conditioner?
The correct model depends on the required range, interface and safety architecture. ZRT512E and ZRT510-R32 support appliance-level %LFL monitoring; ZRT512C is a compact multi-refrigerant option; MH-Z1542B supports compact UART integration; ZP201 is designed around a 5000 ppm alarm point.
Does every R32 air conditioner require a refrigerant sensor?
No single rule applies to every appliance. The requirement depends on the equipment design, refrigerant charge, room or occupied-space conditions, target market and applicable product standard. The OEM should determine this during safety and compliance planning.
What is the difference between ppm, %Vol and %LFL?
ppm and %Vol describe gas concentration in air, while %LFL expresses concentration relative to the refrigerant's lower flammability limit. Do not directly substitute one unit for another without the correct refrigerant properties and validation method.
Can one module detect both R32 and R454B?
Some Winsen models, including ZRT512E and the ZRT512C series, are listed for R32 and R454B configurations. Confirm the exact model suffix, calibration, communication protocol and target gas before ordering samples.
Where should an R32 sensor be installed?
The sensing inlet should be positioned where leaked refrigerant can reach it within the required response time, while being protected from liquid water, contamination and unrealistic airflow. Final placement must be verified in the complete equipment.
Can Winsen provide samples and OEM customization?
Winsen supports model selection, product documentation, sample evaluation and customization discussions for qualified projects. Provide your appliance type, target output, supply voltage, environment and estimated volume through the inquiry form.
Need an R32 Sensor for an Air Conditioner, Heat Pump or VRF System?
Send your refrigerant, target range, power supply, output interface, application environment and project stage. Winsen will help shortlist the appropriate R32 sensor models.