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, ו relay outputsו
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.
חיישן קירור NDIR
חיישן קירור מוליכים למחצה
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 |
Typical Applications
VRF/VRV indoor units & hotel rooms
Mount low (~150–300 mm AFF) near indoor units and pooling points; link alarms to fan shutdown and fresh-air purge.
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.
יחידות מרכז נתונים בשורה/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
| טֶכנוֹלוֹגִיָה | הטוב ביותר עבור | לָנוּעַ | יתרונות | שיקולים |
|---|---|---|---|---|
| NDIR (אינפרא אדום) | 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 (מוליכים למחצה) | A2L/A3 %LEL | 0–100% LEL | Fast response; cost-effective | Cross-sensitivities; periodic calibration |
| Catalytic Bead | פחמימנים כלליים (A3) | 0–100% LEL | Mature tech | Needs O₂; can be poisoned (silicones/lead) |
Placement & Setpoints — Good Practice
- גובה הרכבה: Most refrigerants are heavier than air ⇒ mount low; confirm with airflow studies.
- Coverage: Approx. 5–10 m radius per sensor in open rooms; add units near valves/joints and low pockets.
- Alarm tiers: A2L/A3: pre-alarm ≈25% LFL; main ≈50% LFL. A1: ppm bands (e.g., 1,000–5,000 ppm) per spec.
- Interlocks: Pre-alarm → ventilation; Main → equipment shutdown + beacons/BMS alarm.
Finalize thresholds and quantities against your project specification and local codes.
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FAQs — Infrared (NDIR) Refrigerant Leak Sensors
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.
