AC Freon Leak Sensor (Leak Detector) — Split/VRF • Central AC • Auto A/C
Winsen® manufactures electronic leak sensors for air-conditioning refrigerants across residential, commercial, and automotive applications. For building HVAC, we cover R410AAr R32Ar R454B, and legacy R134a/R22*; for automotive A/C we support R1234yf ir R134A. Choose Yra n ppm išankstinio įspėjimo ir MOS / DIR for %LEL safety interlocks with 4–20 mAAr RS-485 Modbus, ir relės išėjimai ready for BMS/PLC integration.
Model Guide — Pick by AC Type & Refrigerant
Home/Commercial AC — A1 (NDIR PPM)
- Ranges: 0–1,000 / 0–5,000 ppm (custom)
- Outputs: 4–20 mA, RS-485 Modbus, 1–2 relays
- T90 ≤ 30 s • Low drift, long life
*R22 is legacy/service gas in many regions.
Home/Commercial AC — A2L (NDIR PPM / %LEL)
- PPM early warning (NDIR) and/or 0–100% LFL/LEL
- 4–20 mA / RS-485 / relays
- Ideal for VRF/VRV rooms & hotel guestrooms
Automotive A/C — A2L/A1
- NDIR ppm for process/comfort; %LEL for interlocks
- Integrate at charge stations, test booths, bays
- Modbus for line interlocks & traceability
What “AC Freon” Means
In everyday language, “Freon” often means any AC refrigerant. Technically, Freon™ is a trademark historically used for CFC/HCFC/HFC products (e.g., R12/R22). This page uses “AC Freon leak sensor” in the common sense—electronic fixed sensors that detect refrigerant leaks in air-conditioning systems.
NDIR šaltnešio jutiklis
Puslaidininkinis šaltnešio jutiklis
How Infrared (NDIR) Refrigerant Sensors Work
| Stage | What Happens | Nauda |
|---|---|---|
| Emission | IR source emits broadband light through the gas sample. | Reliable optical excitation |
| Filtering | Narrowband optical filter targets refrigerant absorption bands; a second channel serves as reference. | Gas selectivity & drift compensation |
| Detection | Photodetectors measure attenuated signal vs. reference; MCU computes concentration. | Stable ppm / %LEL output |
| Compensation | Temperature/pressure & baseline routines (e.g., ABC optional) correct drift. | Long intervals between calibrations |
Typical AC Applications
Split/VRF indoor units & hotel rooms
Mount low (~150–300 mm above floor) near indoor units, under beds/sofas in hotel rooms, and other pooling points. Pre-alarm → fresh-air purge; main alarm → fan/indoor-unit shutdown.
Central AC air handlers & mechanical rooms
Place near coils, expansion valves, and floor low spots/sumps; use IP-rated enclosures. Integrate with BMS to start purge fans at pre-alarm and trip systems at main alarm.
Line sets, evaporator/condensing sections
Monitor around brazed joints, service valves, and manifolds; avoid strong supply streams that bypass the sensor.
Automotive service bays & EOL test
Position near charging/recovery stations and low-lying areas. Use ppm early warning plus %LFL safety interlocks (beacon/horn/vent).
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 from heavy condensation/dust (filters/enclosure) |
| MOS (puslaidininkis) | A2L/A3%LEL | 0–100% LEL | Fast response; robust; cost-effective | Cross-sensitivities possible; periodic calibration advised |
| Katalizinis karoliukas | General hydrocarbons (A3) | 0–100% LEL | Mature tech for flammables | Requires O₂; susceptible to poisons (silicones/lead) |
Placement & Setpoints — Good Practice for AC
- Montavimo aukštis: Most AC refrigerants are heavier than air ⇒ mount low; confirm with room airflow.
- Aprėptis: ~5–10 m radius per sensor in open rooms; add units near valves/joints and low pockets.
- Signalizacijos pakopos: A2L/A3: pre-alarm ≈25% LFL; main ≈50% LFL. A1: ppm tiers (e.g., 1,000–5,000 ppm) per design spec.
- Užraktai: Pre-alarm → ventilation/start purge; Main → equipment shutdown + horn/beacon/BMS notification.
Užbaikite slenksčius ir kiekius pagal vietinius kodus ir projekto specifikaciją.
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FAQs — Infrared (NDIR) Refrigerant Leak Sensors
Is “AC Freon” the same as refrigerant?
In common use, yes. Freon™ is a trademark historically used for certain refrigerants; we use the term generically here to match search intent.
Do I need ppm or %LEL measurement for AC?
Use ppm (NDIR) for early warning and comfort/process protection. Use %LEL (MOS/NDIR-LEL) to drive safety interlocks for A2L/A3 gases (e.g., R32/R454B).
Where should sensors be installed in rooms?
Near indoor units, valves, joints, and floor-level accumulation points; avoid strong supply air. In hotels, place low and accessible for maintenance.
How often is calibration required?
12–24 months is typical with periodic bump tests; harsher environments may need more frequent checks.
Can Winsen customize for OEM rollouts?
Yes—ranges, firmware, connectors, harnesses, housings, and branding are customizable for volume programs.
