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) and A3 (R290, R600a) gases. Choose N for ppm early warning or MOS/NDIR for %LEL safety interlocks—ready for BMS/PLC via 4–20 mA, RS-485 Modbus, ਅਤੇ relay outputs.
- A1 / A2L / A3 Coverage
- NDIR ppm & MOS %LEL
- OEM/ODM • ਬਲਕ ਆਰਡਰ
- ਤੇਜ਼ ਲੀਡ ਟਾਈਮ
Model Guide — Pick by Refrigerant Class & Measurement
A1 (R410A / R134a) — NDIR PPM
- Typical ranges: 0–1,000 / 0–5,000 ppm
- Outputs: 4–20 mA, RS-485 Modbus, 1–2 relays
- T90 ≤ 30 s • Low drift, long life
A2L (R32 / R454B / R1234yf/ze) — NDIR PPM / %LEL
- PPM early warning and/or 0–100% LFL/LEL
- 4–20 mA / RS-485 / ਰੀਲੇਅ
- VRF/VRV rooms & hotel guestrooms
A3 (R290 / R600a) — %LEL Safety
- Range: 0–100% LEL (NDIR-LEL or 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 fixed, electronic detector that continuously measures refrigerant concentration around air-conditioning equipment and automatically drives alarms ਅਤੇ interlocks (ventilation, fan/indoor-unit shutdown). It complements handheld detectors used by technicians for pinpoint leak search.
ਐਨਡੀਆਰ ਫਰਿੱਜ ਸੈਂਸਰ
ਸੈਮੀਕੰਡਕਟਰ ਰੈਫ੍ਰਿਜੈਂਟ ਸੈਂਸਰ
Technology Options
| ਤਕਨਾਲੋਜੀ | ਲਈ ਵਧੀਆ | ਰੇਂਜ | ਫਾਇਦੇ | ਵਿਚਾਰ |
|---|---|---|---|---|
| NDIR (ਇਨਫਰਾਰੈੱਡ) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | High selectivity & stability; not O₂-dependent; long life | Protect from heavy condensation/dust (filters/enclosure) |
| MOS (ਸੈਮੀਕੰਡਕਟਰ) | A2L/A3 %LEL | 0–100% LEL | ਤੇਜ਼ ਜਵਾਬ; ਮਜ਼ਬੂਤ; ਲਾਗਤ-ਪ੍ਰਭਾਵਸ਼ਾਲੀ | Cross-sensitivities possible; periodic calibration advised |
| Catalytic Bead | ਜਨਰਲ ਹਾਈਡਰੋਕਾਰਬਨ (A3) | 0–100% LEL | Mature tech for flammables | Requires O₂; susceptible to poisons (silicones/lead) |
Typical AC Applications
Split/VRF indoor units & hotel rooms
Mount low (~150–300 mm above floor) near indoor units and pooling points. Pre-alarm → fresh-air purge; main alarm → fan/indoor-unit shutdown.
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
For A2L systems, use %LFL tiers (≈25% pre-alarm; ≈50% main) to trigger ventilation and safe shutdown.
Core Specifications
| ਪੈਰਾਮੀਟਰ | ਮੁੱਲ / ਵਿਕਲਪ |
|---|---|
| ਮਾਪ | NDIR ppm and/or %LFL (MOS/NDIR-LEL) |
| ਆਊਟਪੁੱਟ | 4–20 mA (2/3-ਤਾਰ), RS-485 Modbus RTU, 1–2 ਰੀਲੇ (N.O./N.C.) |
| ਜਵਾਬ ਸਮਾਂ (T90) | ≤ 20–30 s ਆਮ |
| ਸਪਲਾਈ | 12-24 ਵੀਡੀਸੀ (ਬੇਨਤੀ 'ਤੇ ਹੋਰ) |
| ਓਪਰੇਟਿੰਗ ਹਾਲਾਤ | −20…+50 °C; 15-95% RH ਗੈਰ-ਕੰਡੈਂਸਿੰਗ (ਮਾਡਲ-ਨਿਰਭਰ) |
Placement & Setpoints — Good Practice
- ਮਾਊਂਟਿੰਗ ਉਚਾਈ: Most AC refrigerants are heavier than air ⇒ mount low; confirm with on-site airflow.
- Coverage: ~5–10 m radius per sensor in open rooms; add units near valves/joints and low pockets.
- ਅਲਾਰਮ: A2L/A3: pre-alarm ≈25% LFL; main ≈50% LFL. A1: ppm bands (e.g., 1,000–5,000 ppm) per design spec.
- Interlocks: Pre-alarm → ventilation; Main → equipment shutdown + beacons/horns/BMS events.
Finalize thresholds and quantities against local codes and your project specification.
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FAQs — Infrared (NDIR) Refrigerant Leak Sensors
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.
