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) plini. Izberite Je n za ppm zgodnje opozarjanje oz MOS/DIR za varnostne zapore %LEL—pripravljen za BMS/PLC prek 4–20 mA, RS-485 Modbusin relejni izhodi.
Model Guide — Select by Refrigerant Class
A1 HFC/HFO — NDIR PPM
- Ranges: 0–1,000 / 0–5,000 ppm (customizable)
- Izhodi: 4–20 mA, RS-485 Modbus, 1–2 releja
- T90 ≤ 30 s • Majhen zanos, dolga življenjska doba
A2L Low-GWP — NDIR PPM / %LEL
- PPM zgodnje opozorilo in/ali 0–100 % LFL/LEL
- 4–20 mA / RS-485 / releji
- Ideal for VRF/VRV rooms & heat pumps
A3 Vnetljivo — %LEL Varnost
- Razpon: 0–100 % LEL (NDIR-LEL ali MOS)
- Releji za zapore ventilatorja/start-stop
- Robustna ohišja do IP65
Why a Refrigerant Gas Leak Sensor?
- Zgodnje opozorilo: Detect ppm-level leaks before comfort or uptime is affected.
- Varnostne zapore: 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 hladilnega sredstva
Polprevodniški senzor hladilnega sredstva
Tehnološka primerjava
| tehnologija | Najboljše za | Razpon | Prednosti | Premisleki |
|---|---|---|---|---|
| NDIR (infrardeči) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | High selectivity, low drift, not O₂-dependent | Zaščitite pred močno kondenzacijo/prahom (filtri/ohišja) |
| MOS (polprevodnik) | A2L/A3 %LEL | 0–100 % LEL | Hiter odziv; robusten; stroškovno učinkovito | Possible cross-sensitivities; periodic calibration |
| Katalitična kroglica | Splošni ogljikovodiki (A3) | 0–100 % LEL | Zrelo, široko uporabljeno | Needs O₂; can be poisoned (silicones/lead) |
Tipične aplikacije AC
VRF/VRV indoor units & hotel rooms
Montirajte nizko (~150–300 mm nad tlemi) v bližini notranjih enot in zbirališč. Predalarm → odzračevanje svežega zraka; glavni alarm → izklop ventilatorja/notranje enote.
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 center v vrsti/CRAC enote
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 možnosti
| tehnologija | Najboljše za | Razpon | Prednosti | Premisleki |
|---|---|---|---|---|
| NDIR (infrardeči) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | High selectivity, low drift, not O₂-dependent | Zaščitite pred močno kondenzacijo/prahom (filtri/ohišja) |
| MOS (polprevodnik) | A2L/A3 %LEL | 0–100 % LEL | Hiter odziv; robusten; stroškovno učinkovito | Possible cross-sensitivities; periodic calibration |
| Katalitična kroglica | Splošni ogljikovodiki (A3) | 0–100 % LEL | Zrelo, široko uporabljeno | Needs O₂; can be poisoned (silicones/lead) |
Placement & Setpoints — Good Practice
- Montažna višina: Most refrigerants are heavier than air ⇒ mount low; confirm with on-site airflow.
- Pokritost: ~5–10 m polmera na senzor v odprtih prostorih; dodajte enote blizu ventilov/sklepov in nizkih žepov.
- Alarmi: A2L/A3: predalarm ≈25 % LFL; glavni ≈50 % LFL. A1: pasovi ppm (npr. 1.000–5.000 ppm) na specifikacijo projekta.
- Zapore: Pre-alarm → ventilation; Main → equipment shutdown + beacon/horn/BMS event.
Dokončajte mejne vrednosti in količine glede na specifikacijo vašega projekta in lokalne kode.
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Zahtevajte posvetovanje
Pogosta vprašanja — Infrardeči (NDIR) senzorji puščanja hladilnega sredstva
Koliko senzorjev potrebujem na sobo?
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.
Katere pragove alarma naj uporabim?
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.
Kako pogosto naj kalibriram in testiram?
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.
