Electronic AC Leak Sensor (Electronic AC Leak Detector) — Split/VRF • Central AC
Winsen® elektroonilised vahelduvvoolu lekkeandurid pakuvad pidevat ja fikseeritud jälgimist kliimaseadmete külmutusagensid üle elu- ja ärihoonete. Toetame A1 (R134a, R410A, R404A), A2l (R32, R454B, R1234yf/ze) ja A3 (R290, R600a) gaasid. Vali On n ppm varajase hoiatuse jaoks või MOS/IR-LEL %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
- Ranges: 0–1,000 / 0–5,000 ppm (customizable)
- 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 rooms & hotel guestrooms
A3 (R290 / R600a) — %LEL Ohutus
- Vahemik: 0–100% LEL (IR-LEL või MOS)
- Relays for ventilation & shutdown interlocks
- IP options for cold/mechanical spaces
What is an Electronic AC Leak Sensor?
An electronic AC leak sensor is a fixed, continuously-monitoring detector installed near indoor units, AHUs, or mechanical rooms to measure refrigerant concentration and automatically trigger alarmid ja blokeeringud (purge fans, equipment shutdown). It complements the handheld sniffers technicians use for pinpointing leaks.
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) |
Tüüpilised rakendused
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, TXVs, and floor low spots/sumps; use IP-rated housings. Integrate with BMS to start purge fans at pre-alarm and trip systems at main alarm.
Line sets, condenser/evaporator sections
Monitor around brazed joints, service valves, manifolds; avoid strong supply streams that could bypass the sensor.
Soojuspumbad
For A2L/A3 systems, use %LFL tiers (~25% pre-alarm; ~50% main) to trigger ventilation and safe shutdown.
Põhispetsifikatsioonid
| Parameeter | Väärtus / valik |
|---|---|
| Mõõtmine | NDIR ppm ja/või %LFL (MOS/IR-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) |
| Korpused | Sein, paneel, kanal; korpused kuni IP65 |
| Vastavus | CE & RoHS; designed for BMS/PLC integration |
Placement & Setpoints — Good Practice
- Paigalduskõrgus: Most AC refrigerants are heavier than air ⇒ mount low; confirm with room 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 tiers (e.g., 1,000–5,000 ppm) per design spec.
- Blokeeringud: Eelalarm → ventilatsioon; Põhi → seadmete seiskamine + majakad/pasunad/BMS sündmus.
Finalize thresholds and quantities against local codes and your project specification.
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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.
