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) na mga gas. Pumili Ay n para sa ppm maagang babala o MOS/DIR para sa %LEL na mga interlock na pangkaligtasan—handa para sa BMS/PLC sa pamamagitan ng 4–20 mA, RS-485 Modbus, at mga output ng relay.
Model Guide — Select by Refrigerant Class
A1 HFC/HFO — NDIR PPM
- Ranges: 0–1,000 / 0–5,000 ppm (customizable)
- Mga Output: 4–20 mA, RS-485 Modbus, 1–2 relay
- T90 ≤ 30 s • Mababang drift, mahabang buhay
A2L Low-GWP — NDIR PPM / %LEL
- Maagang babala ng PPM at/o 0–100% LFL/LEL
- 4–20 mA / RS-485 / mga relay
- Ideal for VRF/VRV rooms & heat pumps
A3 Nasusunog — %LEL Kaligtasan
- Saklaw: 0–100% LEL (NDIR-LEL o MOS)
- Relays for fan/start-stop interlocks
- Rugged housings up to IP65
Why a Refrigerant Gas Leak Sensor?
- Early warning: Detect ppm-level leaks before comfort or uptime is affected.
- Safety interlocks: 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 Refrigerant Sensor
Semiconductor Refrigerant Sensor
Paghahambing ng Teknolohiya
| Teknolohiya | Pinakamahusay Para sa | Saklaw | Kalamangan | Mga pagsasaalang-alang |
|---|---|---|---|---|
| NDIR (Infrared) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | High selectivity, low drift, not O₂-dependent | Protektahan mula sa mabigat na condensation/dust (mga filter/enclosures) |
| MOS (Semiconductor) | A2L/A3%LEL | 0–100% LEL | Mabilis na tugon; matatag; cost-effective | Possible cross-sensitivities; periodic calibration |
| Catalytic Bead | Pangkalahatang hydrocarbon (A3) | 0–100% LEL | Mature, widely used | Needs O₂; can be poisoned (silicones/lead) |
Typical AC Applications
VRF/VRV indoor units & hotel rooms
Mababa ang bundok (~150–300 mm sa itaas ng sahig) malapit sa mga panloob na unit at pooling point. Pre-alarm → fresh-air purge; pangunahing alarma → pagsara ng fan/indoor-unit.
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.
Mga in-row/CRAC unit ng data center
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.
Mga Pagpipilian sa Teknolohiya
| Teknolohiya | Pinakamahusay Para sa | Saklaw | Kalamangan | Mga pagsasaalang-alang |
|---|---|---|---|---|
| NDIR (Infrared) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | High selectivity, low drift, not O₂-dependent | Protektahan mula sa mabigat na condensation/dust (mga filter/enclosures) |
| MOS (Semiconductor) | A2L/A3%LEL | 0–100% LEL | Mabilis na tugon; matatag; cost-effective | Possible cross-sensitivities; periodic calibration |
| Catalytic Bead | Pangkalahatang hydrocarbon (A3) | 0–100% LEL | Mature, widely used | Needs O₂; can be poisoned (silicones/lead) |
Placement & Setpoints — Good Practice
- Taas ng pag-mount: Most refrigerants are heavier than air ⇒ mount low; confirm with on-site airflow.
- Saklaw: ~5–10 m radius bawat sensor sa mga bukas na silid; magdagdag ng mga yunit na malapit sa mga balbula/joint at mababang bulsa.
- Mga alarm: A2L/A3: pre-alarm ≈25% LFL; pangunahing ≈50% LFL. A1: mga ppm band (hal., 1,000–5,000 ppm) bawat spec ng proyekto.
- Interlocks: Pre-alarm → ventilation; Main → equipment shutdown + beacon/horn/BMS event.
I-finalize ang mga threshold at dami kumpara sa detalye ng iyong proyekto at mga lokal na code.
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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.
