Product: Replacement PM2.5 Dust Sensor for 2S, 3H, 3C, and ProH Air Purifiers Why you need it A worn or faulty PM2.5 sensor causes incorrect airquality readings and prevents your purifier from adjusting fan speed or filter use correctly. Replacing the sensor restores accurate detection so the purifier responds as intended, improving air quality and extending filter life. Key benefits Precise compatibility: Designed specifically as a replacement PM2.5 dust sensor for 2S, 3H, 3C, and ProH models to ensure a fit and reliable operation. Accurate monitoring: precision sensor technology detects PM2.5 particles with professionalgrade accuracy, helping your purifier keep indoor air safer and cleaner. Restores original functionality: Replaces worn or malfunctioning sensors to bring back automatic detection, correct airquality reporting, and filtration performance. Easy installation: Plugandplay replacement with clearly marked connectors and a complete installation guide included for straightforward DIY maintenance—no professional tools required. What it does Measures airborne PM2.5 particles and feeds accurate data to the air purifier's control system. Enables automatic mode decisions (fan speed, filter cycles) based on realtime particle counts. Helps maintain effective filtration by ensuring the purifier responds appropriately to changing air conditions. Compatibility and fit Replacement for sensors used in 2S, 3H, 3C, and ProH air purifier models. Engineered to match the original sensor's electrical and mounting connections for seamless integration. Performance highlights Reliable PM2.5 detection for consistent airquality reporting. Designed to restore the purifier's intended automatic control logic and filtration efficiency. Built to meet the operational requirements of the specified models for dependable longterm use. Practical use scenarios Home with pets: Restores accurate particle detection so the purifier increases cleaning power when pet dander or fur raises PM2.5 levels. Kitchen and cooking: Quickly detects spikes from cooking smoke or grease, prompting faster purification to reduce odors and particles. Child's room or allergy management: Ensures sensitive environments get timely increases in filtration when particle levels rise, improving protection for children and allergy sufferers. What's included Replacement PM2.5 dust sensor compatible with 2S, 3H, 3C, and ProH models Clear connector layout and complete installation guide for easy, safe replacement Trust and usability Fits and functions like the original sensor to restore your purifier's automatic detection and control. Straightforward replacement reduces downtime and avoids the cost and delay of professional . If your purifier is reporting inconsistent air quality or no longer switching modes automatically, this directreplacement PM2.5 sensor is the practical fix to bring performance back to factory intent.