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) gases. Choose Yra n for ppm early warning or MOS / DIR for %LEL safety interlocks—ready for BMS/PLC via 4–20 mAAr RS-485 Modbus, ir relės išėjimai.
Model Guide — Select by Refrigerant Class
A1 HFC/HFO — NDIR PPM
- Ranges: 0–1,000 / 0–5,000 ppm (customizable)
- Outputs: 4–20 mA, RS-485 Modbus, 1–2 relays
- T90 ≤ 30 s • Low drift, long life
A2L Low-GWP — NDIR PPM / %LEL
- PPM early warning and/or 0–100% LFL/LEL
- 4–20 mA / RS-485 / relays
- Ideal for VRF/VRV rooms & heat pumps
A3 Flammable — %LEL Safety
- Range: 0–100% LEL (NDIR-LEL or MOS)
- Relays for fan/start-stop interlocks
- Rugged housings up to IP65
Why a Refrigerant Gas Leak Sensor?
- Išankstinis įspėjimas: Detect ppm-level leaks before comfort or uptime is affected.
- Apsauginiai blokatoriai: Use %LFL thresholds to start ventilation and shut down equipment.
- Integration: 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 šaltnešio jutiklis
Puslaidininkinis šaltnešio jutiklis
Technologijų palyginimas
| Technologijos | Geriausias | Diapazonas | Privalumai | Svarstymai |
|---|---|---|---|---|
| NDIR (infraraudonųjų spindulių) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | High selectivity, low drift, not O₂-dependent | Protect from heavy condensation/dust (filters/enclosures) |
| MOS (puslaidininkis) | A2L/A3%LEL | 0–100% LEL | Fast response; robust; cost-effective | Possible cross-sensitivities; periodic calibration |
| Katalizinis karoliukas | General hydrocarbons (A3) | 0–100% LEL | Subrendęs, plačiai naudojamas | Needs O₂; can be poisoned (silicones/lead) |
Typical AC Applications
VRF/VRV 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.
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.
Duomenų centro eilės/CRAC įrenginiai
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.
Technology Options
| Technologijos | Geriausias | Diapazonas | Privalumai | Svarstymai |
|---|---|---|---|---|
| NDIR (infraraudonųjų spindulių) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | High selectivity, low drift, not O₂-dependent | Protect from heavy condensation/dust (filters/enclosures) |
| MOS (puslaidininkis) | A2L/A3%LEL | 0–100% LEL | Fast response; robust; cost-effective | Possible cross-sensitivities; periodic calibration |
| Katalizinis karoliukas | General hydrocarbons (A3) | 0–100% LEL | Subrendęs, plačiai naudojamas | Needs O₂; can be poisoned (silicones/lead) |
Placement & Setpoints — Good Practice
- Montavimo aukštis: Most refrigerants are heavier than air ⇒ mount low; confirm with on-site airflow.
- Aprėptis: ~5–10 m radius per sensor in open rooms; add units near valves/joints and low pockets.
- Alarms: A2L/A3: pre-alarm ≈25% LFL; main ≈50% LFL. A1: ppm bands (e.g., 1,000–5,000 ppm) per project spec.
- Užraktai: Pre-alarm → ventilation; Main → equipment shutdown + beacon/horn/BMS event.
Užbaikite slenksčius ir kiekius pagal savo projekto specifikaciją ir vietinius kodus.
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FAQs — Infrared (NDIR) Refrigerant Leak Sensors
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.
