AC Refrigerant Sensor (Leak Detector) — Split/VRF • Central AC • Heat Pump
Winsen® electronic AC leak sensors provide continuous, fixed monitoring for air-conditioning refrigerants across residential and commercial buildings. We support A1 (R134a, R410A, R404A), A2L (R32, R454B, R1234yf/ze) and A3 (R290, R600a) gases. Choose Je n za ppm zgodnje opozarjanje oz MOS/IR-LEL for %LEL safety interlocks—ready for BMS/PLC via 4–20 mA, RS-485 Modbusin relejni izhodi.
- A1 / A2L / A3 pokritost
- NDIR ppm & MOS %LEL
- OEM/ODM • Množična naročila
- Hiter dobavni rok
Pick by Refrigerant Class & Measurement
A1 (R410A / R134a) — NDIR PPM
- Tipični razponi: 0–1.000 / 0–5.000 ppm
- Izhodi: 4–20 mA, RS-485 Modbus, 1–2 releja
- T90 ≤ 30 s • Majhen zanos, dolga življenjska doba
A2L (R32 / R454B / R1234yf/ze) — NDIR PPM / %LEL
- PPM early warning and/or 0–100% LFL/LEL
- 4–20 mA / RS-485 / releji
- 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 in interlocks (ventilation, unit shutdown). It complements handheld sniffers used by technicians for pinpoint leak search.
NDIR senzor hladilnega sredstva
Polprevodniški senzor hladilnega sredstva
Technology Options
| tehnologija | Najboljše za | Razpon | Prednosti | Premisleki |
|---|---|---|---|---|
| NDIR (infrardeči) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | High selectivity & stability; not O₂-dependent; long life | Protect optics from condensation/dust (filters/enclosures) |
| MOS (polprevodnik) | A2L/A3 %LEL | 0–100 % LEL | Hiter odziv; robusten; stroškovno učinkovito | Possible cross-sensitivities; periodic calibration advised |
| Katalitična kroglica | Splošni ogljikovodiki (A3) | 0–100 % LEL | Mature technology | Potrebuje O₂; se lahko zastrupi s silikoni/svincem |
Tipične aplikacije
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.
Core Specifications
| Parameter | Vrednost / možnost |
|---|---|
| Merjenje | NDIR ppm and/or %LFL (MOS/IR-LEL) |
| Izhodi | 4–20 mA (2/3-žični), RS-485 Modbus RTU, 1–2 releja (N.O./N.C.) |
| Odzivni čas (T90) | ≤ 20–30 s tipično |
| Dobava | 12–24 VDC (drugi na zahtevo) |
| Pogoji delovanja | −20…+50 °C; 15–95 % RH brez kondenzacije (odvisno od modela) |
| Ohišja | Wall, panel, duct; housings up to IP65 |
| Skladnost | CE & RoHS; designed for BMS/PLC integration |
Placement & Setpoints — Good Practice
- Montažna višina: Most AC refrigerants are heavier than air ⇒ mount low; verify with site airflow.
- Pokritost: ~5–10 m radius per sensor in open rooms; add units near valves/joints and low pockets.
- Alarmi: A2L/A3: pre-alarm ≈25% LFL; main ≈50% LFL. A1: ppm bands (e.g., 1,000–5,000 ppm) per project spec.
- Zapore: Pre-alarm → ventilation; Main → equipment shutdown + beacons/horns/BMS event.
Dokončajte mejne vrednosti in količine glede na specifikacijo vašega projekta in lokalne kode.
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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.
