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）氣體。選擇 是n 用於 ppm 預警或 MOS/DIR 用於 %LEL 安全聯鎖 — 為 BMS/PLC 做好準備，通過 4–20 Ma，，，， RS-485 總線， 和 繼電器輸出。
Model Guide — Select by Refrigerant Class
A1 HFC/HFO — NDIR PPM
- Ranges: 0–1,000 / 0–5,000 ppm (customizable)
- 輸出：4–20 mA、RS-485 Modbus、1–2 個繼電器
- T90 ≤ 30 s • 低漂移，長壽命
A2L Low-GWP — NDIR PPM / %LEL
- PPM 預警和/或 0–100% LFL/LEL
- 4–20 mA / RS-485 / 繼電器
- Ideal for VRF/VRV rooms & heat pumps
Why a Refrigerant Gas Leak Sensor?
- 預警： Detect ppm-level leaks before comfort or uptime is affected.
- 安全聯鎖： Use %LFL thresholds to start ventilation and shut down equipment.
- 一體化： 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製冷劑傳感器
半導體製冷劑傳感器
技術比較
| 技術 | 最適合 | 範圍 | 優勢 | 注意事項 |
|---|---|---|---|---|
| NDIR（紅外線） | A1 ppm； A2L ppm/%LEL | ppm → %LEL | 高選擇性、低漂移、不依賴氧氣 | 防止嚴重凝結/灰塵（過濾器/外殼） |
| MOS（半導體） | A2L/A3%LEL | 0–100% LEL | 快速響應；強壯的;性價比高 | Possible cross-sensitivities; periodic calibration |
| 催化珠 | 一般碳氫化合物 (A3) | 0–100% LEL | 成熟、應用廣泛 | 需要氧氣；可能中毒（矽樹脂/鉛） |
典型交流應用
VRF/VRV indoor units & hotel rooms
安裝在室內設備和匯集點附近的低處（距地面約 150-300 毫米）。預報警→新鮮空氣吹掃；主報警→風機/室內機關閉。
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.
數據中心行內/CRAC 單元
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.
技術選擇
| 技術 | 最適合 | 範圍 | 優勢 | 注意事項 |
|---|---|---|---|---|
| NDIR（紅外線） | A1 ppm； A2L ppm/%LEL | ppm → %LEL | 高選擇性、低漂移、不依賴氧氣 | 防止嚴重凝結/灰塵（過濾器/外殼） |
| MOS（半導體） | A2L/A3%LEL | 0–100% LEL | 快速響應；強壯的;性價比高 | Possible cross-sensitivities; periodic calibration |
| 催化珠 | 一般碳氫化合物 (A3) | 0–100% LEL | 成熟、應用廣泛 | 需要氧氣；可能中毒（矽樹脂/鉛） |
Placement & Setpoints — Good Practice
- 安裝高度： Most refrigerants are heavier than air ⇒ mount low; confirm with on-site airflow.
- 覆蓋範圍： 開放房間中每個傳感器的半徑約為 5–10 m；在閥門/接頭和低口袋附近添加單元。
- 警報： A2L/A3：預報警≈25%LFL；主要約 50% LFL。 A1：每個項目規範的 ppm 範圍（例如 1,000–5,000 ppm）。
- 聯鎖： Pre-alarm → ventilation; Main → equipment shutdown + beacon/horn/BMS event.
根據您的項目規範和當地規範最終確定閾值和數量。
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常見問題解答 — 紅外 (NDIR) 製冷劑洩漏傳感器
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.
