Refrigerant Gas Leak Sensor (Leak Detector) — A1 / A2L / A3
Winsen® manufactures fixed refrigerant gas leak sensors and detectors for A1 (R134a, R410A, R404A), A2L (R32, R454B, R1234yf/ze), and A3 (R290, R600a) plinovi. Odaberite Je n za ppm rano upozorenje ili MOS/DIR za %LEL sigurnosne blokade—spremno za BMS/PLC putem 4–20 mA,, RS-485 Modbus, i relejni izlazi.
Model Guide — Select by Refrigerant Class
A1 HFC/HFO — NDIR PPM
- Ranges: 0–1,000 / 0–5,000 ppm (customizable)
- Izlazi: 4–20 mA, RS-485 Modbus, 1–2 releja
- T90 ≤ 30 s • Malo pomicanje, dug život
A2L Low-GWP — NDIR PPM / %LEL
- PPM rano upozorenje i/ili 0–100% LFL/LEL
- 4–20 mA / RS-485 / releji
- Ideal for VRF/VRV rooms & heat pumps
A3 Zapaljivo — %LEL sigurnost
- Raspon: 0–100% LEL (NDIR-LEL ili MOS)
- Releji za blokade ventilator/start-stop
- Robusna kućišta do IP65
Why a Refrigerant Gas Leak Sensor?
- Rano upozorenje: Detect ppm-level leaks before comfort or uptime is affected.
- Sigurnosne blokade: Use %LFL thresholds to start ventilation and shut down equipment.
- Integracija: Native 4–20 mA / RS-485 / relays for BMS, PLC, horns and beacons.
- Lower loss & service cost: Continuous monitoring reduces refrigerant escape and downtime.
NDIR senzor rashladnog sredstva
Semiconductor senzor rashladnog sredstva
Usporedba tehnologije
| Tehnologija | Najbolje za | Raspon | Prednosti | Razmatranja |
|---|---|---|---|---|
| NDIR (infracrveni) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | Visoka selektivnost, mali drift, ne ovisi o O₂ | Zaštitite od jake kondenzacije/prašine (filtri/kućišta) |
| MOS (poluvoditelj) | A2L/A3%LEL | 0–100% LEL | Brzi odgovor; robustan; isplativo | Possible cross-sensitivities; periodic calibration |
| Katalitička kuglica | Opći ugljikovodici (A3) | 0–100% LEL | Zrelo, široko korišteno | Potreban O₂; može se otrovati (silikoni/olovo) |
Tipične AC primjene
VRF/VRV indoor units & hotel rooms
Montirajte nisko (~150–300 mm iznad poda) u blizini unutarnjih jedinica i točaka okupljanja. Predalarm → pročišćavanje svježim zrakom; glavni alarm → isključivanje ventilatora/unutarnje jedinice.
Chiller & machinery rooms, compressor racks
Place near compressors, oil separators, valves, and floor low spots/sumps. Use IP-rated housings and BMS interlocks.
Cold storage & refrigerated display cases
Install beneath cases and along manifolds/pipe runs. Use condensation-resistant designs; alarms can close curtains and start extract.
Podatkovni centar u nizu/CRAC jedinice
Position in return-air paths, beneath raised floors, and near coils. PPM early warning protects personnel and uptime.
Heat pumps & general HVAC equipment
For A2L/A3, use %LFL tiers (~25% pre-alarm; ~50% main) to trigger ventilation and safe shutdown.
Tehnološke mogućnosti
| Tehnologija | Najbolje za | Raspon | Prednosti | Razmatranja |
|---|---|---|---|---|
| NDIR (infracrveni) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | Visoka selektivnost, mali drift, ne ovisi o O₂ | Zaštitite od jake kondenzacije/prašine (filtri/kućišta) |
| MOS (poluvoditelj) | A2L/A3%LEL | 0–100% LEL | Brzi odgovor; robustan; isplativo | Possible cross-sensitivities; periodic calibration |
| Katalitička kuglica | Opći ugljikovodici (A3) | 0–100% LEL | Zrelo, široko korišteno | Potreban O₂; može se otrovati (silikoni/olovo) |
Placement & Setpoints — Good Practice
- Montažna visina: Most refrigerants are heavier than air ⇒ mount low; confirm with on-site airflow.
- Pokrivenost: ~5–10 m radijus po senzoru u otvorenim prostorijama; dodajte jedinice blizu ventila/zglobova i niskih džepova.
- Alarmi: A2L/A3: predalarm ≈25% LFL; glavni ≈50% LFL. A1: pojasevi ppm (npr. 1000–5000 ppm) po specifikaciji projekta.
- Blokade: Pre-alarm → ventilation; Main → equipment shutdown + beacon/horn/BMS event.
Dovršite pragove i količine prema specifikaciji vašeg projekta i lokalnim propisima.
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Često postavljana pitanja — Infracrveni (NDIR) senzori curenja rashladnog sredstva
How many sensors do I need per room?
As a rule of thumb, plan ~5–10 m radius coverage per sensor in unobstructed rooms. Add units near compressors, valves, brazed joints, and low-lying pockets where gas may pool. Complex layouts and aisle shelving typically require more sensors.
What alarm thresholds should I use?
For A2L/A3 gases, common practice is a pre-alarm around ~25% LFL to start ventilation and a main alarm around ~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. Always follow local codes and your risk assessment.
Where should sensors be mounted?
Most refrigerants are heavier than air, so mount low (≈150–300 mm above floor) near likely leak sources and pooling points. Avoid strong supply air that could bypass the sensor. For ducts/returns, use probe or in-duct models with splash/dust guards.
How often should I calibrate and bump-test?
Typical calibration intervals are 12–24 months, with periodic bump tests (e.g., quarterly/bi-annually). Dusty, humid, or high-traffic sites may require more frequent checks and filter maintenance.
What can cause cross-sensitivity or false alarms?
Strong solvents and aerosols (e.g., silicone sprays, alcohol cleaners, paint fumes) can affect semiconductor elements; heavy condensation or dust can obstruct optics. Use IP-rated housings, splash/dust guards, and good placement/maintenance to minimize effects.
How do I integrate with BMS/PLC?
Sensors provide 4–20 mA (2/3-wire), RS-485 Modbus RTU (configurable address/baud), and 1–2 relays (N.O./N.C.). Typical scaling is 4 mA = 0 and 20 mA = full-scale. Map pre-alarm to ventilation and main alarm to shutdown/interlocks per your control philosophy.
