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）和 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。
- A1 / A2L / A3 覆蓋範圍
- NDIR ppm & MOS %LEL
- OEM/ODM • 批量訂單
- 交貨時間快
Model Guide — Pick by Refrigerant Class & Measurement
A1 (R410A / R134a) — NDIR PPM
- 典型範圍：0–1,000 / 0–5,000 ppm
- 輸出：4–20 mA、RS-485 Modbus、1–2 個繼電器
- T90 ≤ 30 s • 低漂移，長壽命
A2L (R32 / R454B / R1234yf/ze) — NDIR PPM / %LEL
- PPM 預警和/或 0–100% LFL/LEL
- 4–20 mA / RS-485 / 繼電器
- VRF/VRV rooms & hotel guestrooms
A3 (R290 / R600a) — %LEL 安全
- 範圍：0–100% LEL（NDIR-LEL 或 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 固定式電子探測器 that continuously measures refrigerant concentration around air-conditioning equipment and automatically drives 警報 和 互鎖 (ventilation, fan/indoor-unit shutdown). It complements handheld detectors used by technicians for pinpoint leak search.
NDIR製冷劑傳感器
半導體製冷劑傳感器
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 | High selectivity & stability; not O₂-dependent; long life | 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 | 可能存在交叉敏感性；建議定期校準 |
| 催化珠 | 一般碳氫化合物 (A3) | 0–100% LEL | 成熟的易燃物技術 | 需要氧氣；容易中毒（矽/鉛） |
典型交流應用
Split/VRF 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。
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
對於 A2L 系統，使用 %LFL 層（約 25% 預報警；約 50% 主警報）來觸發通氣和安全關閉。
核心規格
| 範圍 | 價值/選項 |
|---|---|
| 測量 | NDIR ppm 和/或 %LFL (MOS/NDIR-LEL) |
| 輸出 | 4–20 mA（2/3 線）、RS-485 Modbus RTU、1–2 個繼電器（常開/常閉） |
| 響應時間（T90） | ≤ 20–30 秒（典型值） |
| 供應 | 12–24 VDC（其他應要求提供） |
| 工作條件 | −20…+50°C； 15–95% 相對濕度，無冷凝（取決於型號） |
Placement & Setpoints — Good Practice
- 安裝高度： Most AC 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: pre-alarm ≈25% LFL; main ≈50% LFL. A1: ppm bands (e.g., 1,000–5,000 ppm) per design spec.
- 聯鎖： Pre-alarm → ventilation; Main → equipment shutdown + beacons/horns/BMS events.
根據當地規範和項目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?
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.
