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 Yra n ppm išankstinio įspėjimo arba MOS/IR-LEL for %LEL safety interlocks—ready for BMS/PLC via 4–20 mAAr RS-485 Modbus, ir relės išėjimai.
- A1 / A2L / A3 aprėptis
- NDIR ppm & MOS %LEL
- OEM/ODM • Masiniai užsakymai
- Greitas pristatymo laikas
Pick by Refrigerant Class & Measurement
A1 (R410A / R134a) — NDIR PPM
- Typical ranges: 0–1,000 / 0–5,000 ppm
- Outputs: 4–20 mA, RS-485 Modbus, 1–2 relays
- T90 ≤ 30 s • Low drift, long life
A2L (R32 / R454B / R1234yf/ze) — NDIR PPM / %LEL
- PPM early warning and/or 0–100% LFL/LEL
- 4–20 mA / RS-485 / relays
- 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 ir interlocks (ventilation, unit shutdown). It complements handheld sniffers used by technicians for pinpoint leak search.
NDIR šaltnešio jutiklis
Puslaidininkinis šaltnešio jutiklis
Technology Options
| Technologijos | Geriausias | Diapazonas | Privalumai | Svarstymai |
|---|---|---|---|---|
| NDIR (infraraudonųjų spindulių) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | High selectivity & stability; not O₂-dependent; long life | Protect optics from condensation/dust (filters/enclosures) |
| MOS (puslaidininkis) | A2L/A3%LEL | 0–100% LEL | Fast response; robust; cost-effective | Possible cross-sensitivities; periodic calibration advised |
| Katalizinis karoliukas | General hydrocarbons (A3) | 0–100% LEL | Mature technology | Reikia O₂; gali apsinuodyti silikonais/švinu |
Tipinės programos
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
| Parametras | Vertė / parinktis |
|---|---|
| Matavimas | NDIR ppm and/or %LFL (MOS/IR-LEL) |
| Išėjimai | 4–20 mA (2/3 laidų), RS-485 Modbus RTU, 1–2 relės (N.O./N.C.) |
| Atsakymo laikas (T90) | ≤ 20–30 s tipiškas |
| Supply | 12–24 VDC (kiti pagal pageidavimą) |
| Eksploatavimo sąlygos | –20…+50 °C; 15–95 % santykinis oro drėgnumas nekondensuojantis (priklauso nuo modelio) |
| Aptvarai | Wall, panel, duct; housings up to IP65 |
| Atitiktis | CE & RoHS; designed for BMS/PLC integration |
Placement & Setpoints — Good Practice
- Montavimo aukštis: Most AC refrigerants are heavier than air ⇒ mount low; verify with site airflow.
- Aprėptis: ~5–10 m radius per sensor in open rooms; add units near valves/joints and low pockets.
- Alarms: A2L/A3: pre-alarm ≈25% LFL; main ≈50% LFL. A1: ppm bands (e.g., 1,000–5,000 ppm) per project spec.
- Užraktai: Pre-alarm → ventilation; Main → equipment shutdown + beacons/horns/BMS event.
Užbaikite slenksčius ir kiekius pagal savo projekto specifikaciją ir vietinius kodus.
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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.
