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）气体。选择 是n 用于 ppm 预警或 MOS/DIR 用于 %LEL 安全联锁 — 为 BMS/PLC 做好准备，通过 4–20 Ma，，，， RS-485 总线， 和 继电器输出。
- A1 / A2L / A3 覆盖范围
- NDIR ppm & MOS %LEL
- OEM/ODM • 批量订单
- 交货时间快
Model Guide — Pick by Refrigerant Class & Measurement
A1 (R410A / R134a) — NDIR PPM
- 典型范围：0–1,000 / 0–5,000 ppm
- 输出：4–20 mA、RS-485 Modbus、1–2 个继电器
- T90 ≤ 30 s • 低漂移，长寿命
A2L (R32 / R454B / R1234yf/ze) — NDIR PPM / %LEL
- PPM 预警和/或 0–100% LFL/LEL
- 4–20 mA / RS-485 / 继电器
- VRF/VRV rooms & hotel guestrooms
A3 (R290 / R600a) — %LEL 安全
- 范围：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 固定式电子探测器 that continuously measures refrigerant concentration around air-conditioning equipment and automatically drives 警报 和 互锁 (ventilation, fan/indoor-unit shutdown). It complements handheld detectors used by technicians for pinpoint leak search.
NDIR制冷剂传感器
半导体制冷剂传感器
技术选择
| 技术 | 最适合 | 范围 | 优势 | 注意事项 |
|---|---|---|---|---|
| NDIR（红外线） | A1 ppm； A2L ppm/%LEL | ppm → %LEL | High selectivity & stability; not O₂-dependent; long life | 防止严重凝结/灰尘（过滤器/外壳） |
| MOS（半导体） | A2L/A3%LEL | 0–100% LEL | 快速响应；强壮的;性价比高 | 可能存在交叉敏感性；建议定期校准 |
| 催化珠 | 一般碳氢化合物 (A3) | 0–100% LEL | 成熟的易燃物技术 | 需要氧气；容易中毒（硅/铅） |
典型交流应用
Split/VRF indoor units & hotel rooms
安装在室内设备和汇集点附近的低处（距地面约 150-300 毫米）。预报警→新鲜空气吹扫；主报警→风机/室内机关闭。
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
对于 A2L 系统，使用 %LFL 层（约 25% 预报警；约 50% 主警报）来触发通气和安全关闭。
核心规格
| 范围 | 价值/选项 |
|---|---|
| 测量 | NDIR ppm 和/或 %LFL (MOS/NDIR-LEL) |
| 输出 | 4–20 mA（2/3 线）、RS-485 Modbus RTU、1–2 个继电器（常开/常闭） |
| 响应时间（T90） | ≤ 20–30 秒（典型值） |
| 供应 | 12–24 VDC（其他应要求提供） |
| 工作条件 | −20…+50°C； 15–95% 相对湿度，无冷凝（取决于型号） |
Placement & Setpoints — Good Practice
- 安装高度： Most AC refrigerants are heavier than air ⇒ mount low; confirm with on-site airflow.
- 覆盖范围： 开放房间中每个传感器的半径约为 5–10 m；在阀门/接头和低口袋附近添加单元。
- 警报： A2L/A3: pre-alarm ≈25% LFL; main ≈50% LFL. A1: ppm bands (e.g., 1,000–5,000 ppm) per design spec.
- 联锁： Pre-alarm → ventilation; Main → equipment shutdown + beacons/horns/BMS events.
根据当地规范和项目规范最终确定阈值和数量。
为什么全球客户选择我们？
该公司始终遵守“精通工艺，科学创新，追求卓越和增值服务”的质量政策。”通过制定生产过程控制计划和工作指导，它建立了标准化，负责和受监管的过程管理系统。此外，该公司独立开发了MES生产管理系统，从而在整个工作流程中实现了全面和视觉管理。
30多年的经验
R&D, manufacture and sales of sensors and sensing solutions.
质量保证持续改进
完整且刚性的流程控制，并取得重大改进。
国际市场
向100多个国家和地区提供传感产品。
稳定的供应链可靠生产
核心组件不受限制，用于制造和测试的高级设备。
R&D STRENGTH TECHNOLOGY INNOVATION
200+ patents, 180+ R&D team members, self-built labs for continous innovation.
一站式服务
专业咨询，快速交货，售后24小时。
Leading the Industry, Innovative & Controllable Technology
With robust R&D capabilities, we maintain sustained input in R&D and unwavering commitment to technological innovation. This not only ensures that we remain at the forefront of industry but also drives continuous innovation, leading the future trend of the sensing industry.
常见问题解答 — 红外 (NDIR) 制冷剂泄漏传感器
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.
