AC Refrigerant Sensor (Leak Detector) — Split/VRF • Central AC • Heat Pump
Winsen® electronic AC leak sensors provide continuous, fixed monitoring for agenti frigorifici pentru aer conditionat across residential and commercial buildings. We support A1 (R134a, R410A, R404A), A2L (R32, R454B, R1234yf/ze) and A3 (R290, R600a) gases. Choose Este n pentru avertizare timpurie ppm sau MOS/IR-LEL for %LEL safety interlocks—ready for BMS/PLC via 4–20 Ma, RS-485 Modbus, și ieșiri releu.
- Acoperire A1 / A2L / A3
- NDIR ppm & MOS %LEL
- OEM/ODM • Comenzi în vrac
- Timp de livrare rapid


Pick by Refrigerant Class & Measurement
A1 (R410A / R134a) — NDIR PPM
- Domenii tipice: 0–1.000 / 0–5.000 ppm
- Ieșiri: 4–20 mA, RS-485 Modbus, 1–2 relee
- T90 ≤ 30 s • Derivare redusă, durată lungă de viață
A2L (R32 / R454B / R1234yf/ze) — NDIR PPM / %LEL
- PPM early warning and/or 0–100% LFL/LEL
- 4–20 mA / RS-485 / relee
- VRF/VRV rooms & hotel guestrooms
A3 (R290 / R600a) — %LEL Safety
- Range: 0–100% LEL (IR-LEL or MOS)
- Relays for ventilation & shutdown interlocks
- IP options for plant/mechanical rooms
What is an AC Refrigerant Sensor?
An AC refrigerant sensor is a fixed, electronic detector installed near AC equipment to measure refrigerant concentration and automatically trigger alarms şi interlocks (ventilation, unit shutdown). It complements handheld sniffers used by technicians for pinpoint leak search.
Senzor frigorific ndir
Senzor frigorific semiconductor
Opțiuni de tehnologie
| Tehnologie | Cel mai bun pentru | Gamă | Avantaje | Considerații |
|---|---|---|---|---|
| Ndir (infraroșu) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | High selectivity & stability; not O₂-dependent; long life | Protect optics from condensation/dust (filters/enclosures) |
| MOS (semiconductor) | A2L/A3%LEL | 0–100% LEL | Răspuns rapid; robust; rentabil | Possible cross-sensitivities; periodic calibration advised |
| Catalytic Bead | Hidrocarburi generale (A3) | 0–100% LEL | Mature technology | Needs O₂; poate fi otrăvit cu siliconi/plumb |
Aplicații tipice

Split/VRF indoor units & hotel rooms
Mount low (~150–300 mm above floor) near indoor units and pooling points. Pre-alarm → fresh-air purge; main alarm → fan/indoor-unit shutdown.

Central AC (AHU/MAU) & mechanical rooms
Place near coils, TXVs, service valves, and floor low spots/sumps; use IP-rated housings and BMS interlocks.

Line sets & evaporator/condenser sections
Monitor around brazed joints, manifolds; avoid strong supply streams that could bypass the sensor.

Heat pumps
For A2L systems, use %LFL tiers (≈25% pre-alarm; ≈50% main) to trigger ventilation and safe shutdown.
Specificații de bază
| Parametru | Valoare/Opțiune |
|---|---|
| Măsurare | NDIR ppm and/or %LFL (MOS/IR-LEL) |
| Ieșiri | 4–20 mA (2/3 fire), RS-485 Modbus RTU, 1–2 relee (N.O./N.C.) |
| Timp de răspuns (T90) | ≤ 20–30 s tipic |
| Livra | 12–24 VDC (altele la cerere) |
| Condiții de operare | −20…+50 °C; 15–95% RH fără condensare (în funcție de model) |
| Incinte | Perete, panou, conductă; carcase până la IP65 |
| Conformitate | CE & RoHS; designed for BMS/PLC integration |
Placement & Setpoints — Good Practice
- Mounting height: Most AC refrigerants are heavier than air ⇒ mount low; verify with site airflow.
- Coverage: ~5–10 m rază per senzor în încăperi deschise; adăugați unități lângă supape/articulații și buzunare joase.
- Alarme: A2L/A3: pre-alarma ≈25% LFL; principal ≈50% LFL. A1: benzi de ppm (de exemplu, 1.000–5.000 ppm) per specificații de proiect.
- Interlocks: Pre-alarm → ventilation; Main → equipment shutdown + beacons/horns/BMS event.
Finalizați pragurile și cantitățile în raport cu specificațiile proiectului și codurile locale.
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FAQs — Freon Gas Sensors
How many sensors are needed in a guestroom or office?
Plan ~5–10 m radius coverage per sensor in open rooms. Add units near indoor units, valves, joints, and floor-level pockets where gas can accumulate. Irregular layouts typically need more sensors.
Should I choose ppm or %LEL measurement?
Use ppm (NDIR) for early warning and comfort/process monitoring; use %LEL (MOS or IR-LEL) to drive safety interlocks for A2L/A3 systems. Many projects deploy both.
Where exactly should sensors be mounted?
Most AC refrigerants are denser than air; mount low (≈150–300 mm AFF) near likely leak sources and pooling points. Avoid strong supply air. Duct/return versions can monitor airflow.
How often do I need calibration and bump tests?
Typical calibration is every 12–24 months with periodic bump tests (quarterly/biannual). Dusty/humid or aerosol-rich sites may need more frequent checks and filter maintenance.
What causes false alarms or cross-sensitivity?
Solvents/aerosols (silicone sprays, alcohol cleaners, paints) can affect semiconductor elements; heavy condensation/dust can obstruct optics. Use IP-rated housings, splash/dust guards, and good placement.
Can Winsen customize for OEM/volume rollouts?
Yes—ranges, firmware/Modbus mapping, connectors/harnesses, housings (IP), labels/branding, and packaging are customizable for volume deployments.















