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) gas. Memilih Adalah n untuk ppm peringatan dini atau MOS/DIR untuk interlock pengaman %LEL—siap untuk BMS/PLC via 4–20 ma, Modbus RS-485, Dan keluaran relai.
Model Guide — Select by Refrigerant Class
A1 HFC/HFO — NDIR PPM
- Kisaran: 0–1.000 / 0–5.000 ppm (dapat disesuaikan)
- Keluaran: 4–20 mA, RS-485 Modbus, 1–2 relai
- T90 ≤ 30 dtk • Drift rendah, umur panjang
A2L GWP Rendah — NDIR PPM / %LEL
- Peringatan dini PPM dan/atau 0–100% LFL/LEL
- 4–20 mA / RS-485 / relai
- Ideal for VRF/VRV rooms & heat pumps
A3 Mudah terbakar — %LEL Keamanan
- Kisaran: 0–100% LEL (NDIR-LEL atau MOS)
- Relai untuk interlock kipas/start-stop
- Perumahan kokoh hingga IP65
Why a Refrigerant Gas Leak Sensor?
- Peringatan dini: Detect ppm-level leaks before comfort or uptime is affected.
- Interlock keselamatan: Use %LFL thresholds to start ventilation and shut down equipment.
- Integrasi: Native 4–20 mA / RS-485 / relays for BMS, PLC, horns and beacons.
- Lower loss & service cost: Continuous monitoring reduces refrigerant escape and downtime.
Sensor Refrigeran Ndir
Sensor Refrigeran Semikonduktor
Perbandingan Teknologi
| Teknologi | Terbaik Untuk | Jangkauan | Keuntungan | Pertimbangan |
|---|---|---|---|---|
| NDIR (Inframerah) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | Selektivitas tinggi, drift rendah, tidak bergantung pada O₂ | Lindungi dari kondensasi/debu berat (filter/penutup) |
| Mos (semikonduktor) | A2L/A3%LEL | 0–100% LEL | Respon cepat; kokoh; hemat biaya | Possible cross-sensitivities; periodic calibration |
| Manik Katalitik | Hidrokarbon umum (A3) | 0–100% LEL | Dewasa, banyak digunakan | Kebutuhan O₂; dapat diracuni (silikon/timbal) |
Aplikasi AC Khas
VRF/VRV indoor units & hotel rooms
Pasang rendah (~150–300 mm di atas lantai) di dekat unit dalam ruangan dan titik pengumpulan. Pra-alarm → pembersihan udara segar; alarm utama → mematikan kipas/unit dalam-ruang.
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.
Unit baris pusat data/CRAC
Position in return-air paths, beneath raised floors, and near coils. PPM early warning protects personnel and uptime.
Heat pumps & general HVAC equipment
Untuk A2L/A3, gunakan tingkat %LFL (~25% pra-alarm; ~50% utama) untuk memicu ventilasi dan pematian yang aman.
Pilihan Teknologi
| Teknologi | Terbaik Untuk | Jangkauan | Keuntungan | Pertimbangan |
|---|---|---|---|---|
| NDIR (Inframerah) | A1 ppm; A2L ppm/%LEL | ppm → %LEL | Selektivitas tinggi, drift rendah, tidak bergantung pada O₂ | Lindungi dari kondensasi/debu berat (filter/penutup) |
| Mos (semikonduktor) | A2L/A3%LEL | 0–100% LEL | Respon cepat; kokoh; hemat biaya | Possible cross-sensitivities; periodic calibration |
| Manik Katalitik | Hidrokarbon umum (A3) | 0–100% LEL | Dewasa, banyak digunakan | Kebutuhan O₂; dapat diracuni (silikon/timbal) |
Placement & Setpoints — Good Practice
- Ketinggian pemasangan: Kebanyakan zat pendingin lebih berat daripada udara ⇒ rendah; konfirmasikan dengan aliran udara di tempat.
- Cakupan: ~radius 5–10 m per sensor di ruangan terbuka; tambahkan unit di dekat katup/sambungan dan kantong rendah.
- Alarm: A2L/A3: pra-alarm ≈25% LFL; utama ≈50% LFL. A1: pita ppm (misalnya 1.000–5.000 ppm) per spesifikasi proyek.
- Interlock: Pra-alarm → ventilasi; Utama → pemadaman peralatan + acara suar/klakson/BMS.
Selesaikan ambang batas dan kuantitas berdasarkan spesifikasi proyek dan kode lokal Anda.
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FAQ — Sensor Kebocoran Refrigeran Inframerah (NDIR).
Berapa banyak sensor yang saya perlukan per ruangan?
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.
Ambang batas alarm apa yang harus saya gunakan?
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.
Seberapa sering saya harus mengkalibrasi dan melakukan uji coba?
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.
