Infrared Refrigerant Leak Sensor (NDIR) — PPM Early Warning & %LEL Safety
Winsen® infrared (NDIR) refrigerant leak sensors provide stable, selective measurement for A1, A2L, and A3 gases—R134a, R410A, R32, R454B, R1234yf/ze, R290, R600a. Choose ppm-level accuracy for early warning, or %LFL/%LEL for safety interlocks. Seamless BMS/PLC integration via 4-20 mA, RS-485 Modbus, i sortides de relé.
Why Infrared (NDIR) for Refrigerant Leak Detection?
High Selectivity
NDIR measures gas absorption at specific IR wavelengths, delivering excellent selectivity for HFC/HFO refrigerants and robust A2L/A3 options.
Stability & Low Drift
Dual-channel optical design with reference beam minimizes temperature/ageing drift, extending calibration intervals (often 12–24 months).
Not O₂-Dependent
Infrared sensing does not require oxygen, unlike catalytic beads—ideal for machinery rooms, cold rooms, and enclosed HVAC spaces.
Model Guide — Select by Class & Measurement
Infrared (NDIR) refrigerant leak sensors and detectors for A1, A2L, and A3 gases: R32, R454B, R1234yf/ze, R134a, R410A, R290, R600a. PPM early warning & %LEL safety, 4–20 mA, RS-485 Modbus, relay outputs. OEM/ODM by Winsen® for bulk orders.
Sensor de refrigerant ndir
Sensor de refrigerant de semiconductors
How Infrared (NDIR) Refrigerant Sensors Work
| Stage | What Happens | Benefit |
|---|---|---|
| Emission | IR source emits broadband light through the gas sample. | Reliable optical excitation |
| Filtering | Narrowband optical filter targets refrigerant absorption bands; a second channel serves as reference. | Gas selectivity & drift compensation |
| Detection | Photodetectors measure attenuated signal vs. reference; MCU computes concentration. | Stable ppm / %LEL output |
| Compensation | Temperature/pressure & baseline routines (e.g., ABC optional) correct drift. | Long intervals between calibrations |
Aplicacions típiques
VRF/VRV indoor units & hotel rooms
Munteu baix (~150–300 mm AFF) a prop de les unitats interiors i dels punts d'agrupació; enllaça les alarmes amb l'aturada del ventilador i la purga d'aire fresc.
Chiller & machinery rooms, compressor racks
Place near compressors, separators, valves, and low spots/sumps; use IP-rated housings and BMS interlocks.
Cold storage & refrigerated display cases
Install beneath cases and along manifolds/pipe runs; choose condensation-resistant designs and curtain/exhaust interlocks.
Unitats en fila del centre de dades/CRAC
Position in return air, under raised floors, and near coils; ppm early warning protects personnel and uptime.
Heat pumps & general HVAC
For A2L/A3, use %LFL tiers (e.g., ~25% pre-alarm; ~50% main) to trigger ventilation and equipment shutdown.
Infrared vs. Other Technologies
| Tecnologia | Millor per | Interval | Avantatges | Consideracions |
|---|---|---|---|---|
| NDIR (infrarojos) | A1 ppm; A2L ppm/%LEL; A3 %LEL (IR-LEL) | ppm → %LEL | High selectivity, low drift, not O₂-dependent | Higher initial cost; protect from heavy condensation/dust |
| MOS (Semiconductor) | A2L/A3%LEL | 0-100% LEL | Fast response; cost-effective | Cross-sensitivities; periodic calibration |
| Perla catalítica | Hidrocarburs generals (A3) | 0-100% LEL | Mature tech | Needs O₂; can be poisoned (silicones/lead) |
Placement & Setpoints — Good Practice
- Alçada de muntatge: La majoria dels refrigerants són més pesats que l'aire ⇒ muntar baix; confirmar amb estudis de flux d'aire.
- Cobertura: Approx. 5–10 m radius per sensor in open rooms; add units near valves/joints and low pockets.
- Nivells d'alarma: A2L/A3: pre-alarm ≈25% LFL; main ≈50% LFL. A1: ppm bands (e.g., 1,000–5,000 ppm) per spec.
- Enclavaments: Pre-alarm → ventilation; Main → equipment shutdown + beacons/BMS alarm.
Finalitzeu els llindars i les quantitats amb l'especificació del vostre projecte i els codis locals.
Per què els clients globals ens trien?
L'empresa s'adhereix constantment a la política de qualitat de "Artesania fina, innovació científica, recerca de l'excel·lència i servei de valor afegit". Mitjançant la formulació de plans de control del procés de producció i instruccions de treball, ha establert un sistema de gestió de processos estandarditzat, responsable i regulat. A més, l'empresa ha desenvolupat de manera independent un sistema de gestió de producció MES, que permet una gestió integral i visual de tot el flux de treball.
MÉS DE 30 ANYS D'EXPERIÈNCIA
R&D, manufacture and sales of sensors and sensing solutions.
GARANTIA DE QUALITAT MILLORA CONTINUA
Control de flux de procés complet i rígid, juntament amb millores significatives.
MERCAT INTERNACIONAL
Entrega productes de detecció a més de 100 països i regions.
CADENA DE SUMINISTRO ESTABLE PRODUCCIÓ FIABLE
Components bàsics no subjectes a restriccions, equips avançats per a la fabricació i prova.
R&D STRENGTH TECHNOLOGY INNOVATION
200+ patents, 180+ R&D team members, self-built labs for continous innovation.
Servei únic
Consulta professional, lliurament ràpid, assistència postvenda les 24 hores.
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.
Sol·licitar la consulta
Preguntes freqüents: sensors de fuites de refrigerant per infrarojos (NDIR).
Is NDIR better than MOS for refrigerants?
For ppm early warning and long-term stability, NDIR is typically preferred. For %LEL safety trips on A2L/A3 gases, NDIR-LEL or MOS can both be used depending on budget and environment.
How often do NDIR sensors need calibration?
12–24 months is common with periodic bump tests. High-dust or high-humidity sites may require more frequent checks and filter maintenance.
Where should the sensor be installed?
Near likely leak sources (compressors, valves, joints) and low-lying accumulation points; avoid strong supply air that could bypass the sensor.
Do Winsen IR sensors integrate with BMS/PLC?
Yes—native 4–20 mA, RS-485 Modbus RTU, and relay contacts make integration straightforward.
Can you customize for OEM programs?
Absolutely. We customize ranges, firmware, connectors, harnesses, housings, and branding for volume deployments.
