AC Gas Leak Sensor (Air Conditioner Refrigerant Leak Detector) — Split/VRF • Central AC • Heat Pump
Winsen® manufactures fixed AC gas leak sensors for residential and commercial air-conditioning systems. We cover A1 (R134a, R410A, R404A), A2l (R32, R454B, R1234yf/ze) ja A3 (R290, R600a) gaasid. Vali On n ppm varajase hoiatuse jaoks või MOS/DIR %LEL turvablokeeringutele – valmis BMS/PLC jaoks 4–20 mA, RS-485 Modbusja relee väljundid.
- A1 / A2L / A3 katvus
- NDIR ppm & MOS %LEL
- OEM/ODM • Hulgitellimused
- Kiire teostusaeg


Model Guide — Pick by Refrigerant Class & Measurement
A1 (R410A / R134a) – NDIR PPM
- Tüüpilised vahemikud: 0–1000 / 0–5000 ppm
- Väljundid: 4–20 mA, RS-485 Modbus, 1–2 releed
- T90 ≤ 30 s • Väike triiv, pikk kasutusiga
A2L (R32 / R454B / R1234yf/ze) – NDIR PPM / %LEL
- PPM varajane hoiatus ja/või 0–100% LFL/LEL
- 4–20 mA / RS-485 / releed
- VRF/VRV rooms & hotel guestrooms
A3 (R290 / R600a) — %LEL Ohutus
- Vahemik: 0–100% LEL (NDIR-LEL või MOS)
- Relays for ventilation & shutdown interlocks
- IP options for plant rooms and cold spaces
What is an AC Gas Leak Sensor?
An AC gas leak sensor is a fikseeritud, elektrooniline detektor that continuously measures refrigerant concentration around air-conditioning equipment and automatically drives alarmid ja blokeeringud (ventilation, fan/indoor-unit shutdown). It complements handheld detectors used by technicians for pinpoint leak search.
NDIR külmutusagensi andur
Pooljuht külmutusagensi andur
Tehnoloogia valikud
| Tehnoloogia | Parim jaoks | Vahemik | Eelised | Kaalutlused |
|---|---|---|---|---|
| NDIR (infrapuna) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | High selectivity & stability; not O₂-dependent; long life | Protect from heavy condensation/dust (filters/enclosure) |
| MOS (pooljuht) | A2L/A3%LEL | 0–100% LEL | Kiire reageerimine; vastupidav; tasuv | Cross-sensitivities possible; periodic calibration advised |
| Katalüütiline rant | Üldised süsivesinikud (A3) | 0–100% LEL | Mature tech for flammables | Requires O₂; susceptible to poisons (silicones/lead) |
Typical AC Applications

Split/VRF indoor units & hotel rooms
Paigaldage madalale (~150–300 mm põrandast kõrgemale) siseseadmete ja kogumiskohtade lähedusse. Eelhäire → värske õhu puhastamine; põhihäire → ventilaatori/siseseadme väljalülitamine.

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

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

Heat pumps & general HVAC equipment
A2L-süsteemide puhul kasutage ventilatsiooni ja ohutu seiskamise käivitamiseks %LFL taset (≈25% eelhäire; ≈50% põhi).
Põhispetsifikatsioonid
| Parameeter | Väärtus / valik |
|---|---|
| Mõõtmine | NDIR ppm ja/või %LFL (MOS/NDIR-LEL) |
| Väljundid | 4–20 mA (2/3-juhtmeline), RS-485 Modbus RTU, 1–2 releed (N.O./N.C.) |
| Reageerimisaeg (T90) | ≤ 20–30 s tüüpiline |
| Pakkumine | 12–24 VDC (muud nõudmisel) |
| Kasutustingimused | −20…+50 °C; 15–95% suhteline õhuniiskus mittekondenseeruv (sõltub mudelist) |
Placement & Setpoints — Good Practice
- Paigalduskõrgus: Most AC refrigerants are heavier than air ⇒ mount low; confirm with on-site airflow.
- Katvus: ~5–10 m raadiusega anduri kohta avatud ruumides; lisada üksused ventiilide/liigendite ja madalate taskute lähedusse.
- Alarmid: A2L/A3: pre-alarm ≈25% LFL; main ≈50% LFL. A1: ppm bands (e.g., 1,000–5,000 ppm) per design spec.
- Blokeeringud: Pre-alarm → ventilation; Main → equipment shutdown + beacons/horns/BMS events.
Lõpetage künnised ja kogused vastavalt kohalikele koodidele ja oma projekti spetsifikatsioonile.
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KKK – infrapuna (NDIR) külmutusagensi lekkeandurid
How many sensors do I need per room?
Plan ~5–10 m radius coverage per sensor in open rooms. Add units near indoor units, valves, joints, and floor-level pockets where gas may accumulate. Irregular layouts typically need more sensors.
What alarm thresholds should I use?
For A2L/A3 gases: pre-alarm ≈25% LFL to start ventilation; main ≈50% LFL to trip equipment and trigger beacons/horns. For A1 gases, use ppm bands (e.g., 1,000–5,000 ppm) per project spec and risk assessment.
Where should the sensor be mounted?
Most AC refrigerants are heavier than air; mount low (≈150–300 mm above floor) near likely leak sources and pooling points. Avoid strong supply air that could bypass the sensor. Probe/duct versions can monitor return air.
How often should I calibrate and bump-test?
Typical calibration is every 12–24 months with periodic bump tests (quarterly/biannual). Dusty or humid sites, or areas with cleaning aerosols, may need more frequent checks and filter maintenance.
Which technology should I choose: NDIR or MOS?
Choose NDIR for ppm early warning and long-term stability; choose MOS or IR-LEL for %LEL safety interlocks on A2L/A3 systems. Many sites use both tiers for redundancy.
Can Winsen customize for OEM/volume programs?
Yes—ranges, firmware, Modbus mapping, connectors/harnesses, housings (IP rating), labels/branding, and packaging can be tailored for volume deployments.















