R1234yf Leak Sensor (1234yf Leak Detector) — A2L Refrigerant Monitoring
Winsen® provides fixed R1234yf leak sensors and detectors for automotive MAC (manufacturing, service bays, end-of-line testing) and HVAC heat-pump/VRF deployments that adopt A2L refrigerants. Choose NDIR for ppm early warning or MOS/NDIR for %LEL safety interlocks—ready for BMS/PLC via 4–20 mA, RS-485 Modbus, and relay outputs.
Where R1234yf Leak Sensors Are Used
Automotive Service Bays & Garages
Monitor near service manifolds, charging/recovery stations, under-vehicle pits, and low-lying accumulation points. Link alarms to exhaust fans and technician beacons for rapid response.
OEM Assembly & End-of-Line Test
HVAC/Heat Pump & VRF Adoptions
NDIR Refrigerant Sensor
Semiconductor Refrigerant Sensor
Model Guide — Select Your R1234yf Leak Sensor
NDIR PPM Sensor (Early Warning)
- Range: 0–1,000 / 0–5,000 ppm (customizable)
- Outputs: 4–20 mA, RS-485 Modbus, 1–2 relays
- Response: T90 ≤ 30 s; low drift, long life
- Use: Process monitoring, comfort spaces, uptime protection
%LEL Sensor (Safety Interlocks)
- Range: 0–100% LFL/LEL
- Outputs: 4–20 mA / RS-485 / relays
- Alarms: Typical pre-alarm ~25% LFL; main ~50% LFL
- Use: Ventilation start, equipment shutdown, beacon/horn
Panel / Duct / IP65 Options
- Wall, panel, duct probes; splash/dust guards
- Operating: −20…+50 °C; 15–95% RH (non-condensing)*
- Housings up to IP65 for rugged areas
- *Model-dependent; consult datasheet
How It Works — Technology Overview
| Technology | Best For | Range | Advantages | Considerations |
|---|---|---|---|---|
| NDIR (Non-Dispersive Infrared) | PPM early warning; stability | 0–1,000 / 0–5,000 ppm (custom) | High selectivity, low drift, long service life | Protect from heavy condensation/dust (use filters/enclosures) |
| MOS / NDIR-LEL | %LFL safety interlocks | 0–100% LFL/LEL | Fast response; robust; cost-effective for safety trips | Cross-sensitivity possible; periodic calibration recommended |
Placement & Setpoints — Good Practice
- Mounting height: R1234yf is denser than air; mount low (≈150–300 mm above floor) near likely leak sources and pooling points.
- Covers & guards: Use IP-rated housings or splash/dust guards in busy service areas and test booths.
- Setpoints: Early warning via ppm (comfort, process) and safety via %LFL bands (e.g., ~25% pre-alarm; ~50% main). Tie to fans, interlocks, and beacons.
- Integration: 4–20 mA and RS-485 Modbus to BMS/PLC; relays for direct control of ventilation/shutdown.
Typical HVAC Applications
VRF/VRV indoor units & hotel rooms
Mount low (~150–300 mm above floor) near indoor units and pooling points. Tie alarms to fan shutdown and fresh-air purge; choose ppm or %LEL setpoints per spec.
Chiller & machinery rooms, compressor racks
Place near compressors, oil separators, valves, and low spots/sumps. Use IP-rated enclosures and BMS interlocks: pre-alarm → purge; main alarm → trip plant.
Cold storage & refrigerated display cases
Install under cases and along manifolds/pipe runs. Select low-temperature, condensation-resistant housings; alarms can start extract and close night curtains.
Data center in-row/CRAC units
Position in return-air paths, beneath raised floors, and near coils. PPM early warning protects personnel and uptime; integrate shutdown and ventilation override.
Heat pump & general HVAC equipment
For A2L/A3, monitor near compressors/valves and in return air; use %LFL interlocks for safe shutdown. Weatherproof housings for outdoor units.
Core Specifications (Typical)
| Parameter | Value / Option |
|---|---|
| Ciljni plin | R1234yf (A2L) |
| Measurement | NDIR ppm and/or %LFL (MOS/NDIR) |
| Outputs | 4–20 mA (2/3-wire), RS-485 Modbus RTU, 1–2 relays (N.O./N.C.) |
| Response Time (T90) | ≤ 20–30 s typical |
| Supply | 12–24 VDC (others on request) |
| Operating Conditions | −20…+50 °C; 15–95% RH non-condensing (model-dependent) |
| Enclosures | Wall, panel, duct; up to IP65 |
| Skladnost | CE, RoHS; BMS/PLC integration |
Sensor Technologies: NDIR vs. MOS
| Značilnost | NDIR (Infrared) | MOS (Semiconductor) |
|---|---|---|
| Natančnost | High (±2% FS) | Moderate (±5% FS) |
| Odzivni čas | 1–3 seconds | <1 second |
| Power Consumption | <25 mW | <50 mW |
| Lifetime | >5 years | 2–3 years |
| Cost | Higher | Lower |
| Best Use | Safety-critical HVAC & commercial | Low-cost appliances |
Recommendation for Oman:
For large-scale and safety-critical systems like district cooling, hotels, and cold storage, choose NDIR technology. For home appliances and low-cost products, MOS sensors provide a cost-effective alternative.
Why Global Clients Choose Us?
The company consistently adheres to the quality policy of “Fine Craftsmanship, Scientific Innovation, Pursuit of Excellence, and Value-Added Service.” By formulating production process control plans and work instructions, it has established a standardized, accountable, and regulated process management system. Additionally, the company has independently developed an MES production management system, enabling comprehensive and visual management across the entire workflow.
30+ YEARS OF EXPERIENCE
R&D, manufacture and sales of sensors and sensing solutions.
QUALITY GUARANTEE CONTINOUS IMPROVEMENT
Complete and rigid process flow control, coupled with significant improvements.
INTERNATIONAL MARKET
Deliver sensing products to more than 100 countries and regions.
STABLE SUPPLY CHAIN RELIABLE PRODUCTION
Core components not subject to constraints, advanced equipments for manufaturing and test.
R&D STRENGTH TECHNOLOGY INNOVATION
200+ patents, 180+ R&D team members, self-built labs for continous innovation.
Storitev na enem mestu
Professional consultation, fast delivery, 24 hours after-sales support.
Leading the Industry, Innovative & Controllable Technology
With robust R&D capabilities, we maintain sustained input in R&D and unwavering commitment to technological innovation. This not only ensures that we remain at the forefront of industry but also drives continuous innovation, leading the future trend of the sensing industry.
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FAQs — Refrigerant Leak Sensors & Detectors
Is R1234yf flammable?
It’s classified as A2L (mildly flammable). Projects typically use %LFL alarm bands for safety interlocks and evacuation/ventilation logic.
Should I pick ppm or %LFL measurement?
Use ppm (NDIR) for early warning and process monitoring. Use %LFL (MOS/NDIR-LEL) to drive safety interlocks such as ventilation start and equipment shutdown. Many facilities deploy both.
Where do I install sensors in a workshop?
Near charging/recovery stations, hose sets, brazed joints, and low-lying areas where gas may accumulate. Avoid direct supply air and strong drafts that bypass the sensor.
How often is calibration required?
Typical intervals are 12–24 months, with periodic bump tests. High-traffic or dusty areas may require more frequent checks.
Do you support OEM customization?
Yes—custom ranges, firmware, connectors, harnesses, labels/branding, and packaging for volume orders are available.
