How to adjust the sensitivity of the air quality sensor

When you operate the product for the first time, the air quality sensor is set at the normal sensitivity. If the air quality indicator remains at “Very Unhealthy (Red)” or Good (Blue) for more than two hours, you can adjust the sensor’s sensitivity as follows.

1. While the product is operating, press the Airflow speed button and the PM information button simultaneously for more than 3 seconds.
   
   
   
2. Display the current air quality sensor sensitivity on the digital Indicator. To indicate the air quality sensor sensitivity is being adjusted, the Level 1 Airflow Speed Indicator and PM1.0, PM2.5, and PM10 indicators are turned on.
   
   
   
3. Press the PM information button to change the air quality sensor sensitivity.
   
4. If the Airflow speed and PM information buttons are pressed and held simultaneously for more than 3 seconds, or if left alone for more than 7 seconds, then the selected air quality sensor sensitivity is applied.