When multiple Xiaomi Smart Air Purifier 4s are used in the same environment, why are the air quality status lights displayed in different colors?

Solution:

First of all, in the actual environment, since dust will flow with the flow of air, it is difficult to ensure that the dust value in any two places is the same even in the same small room, and Xiaomi Smart Air Purifier 4 sensor sensitivity Very high, so there will be differences as well. PM2.5 difference between two air purifiers (difference calculation method: (average-reading)/average), within 10% is a normal phenomenon. Second, any electronic device is subject to tolerances, which can cause differences in sensor-related voltages, which in turn cause differences in sensor output values. If the PM2.5 readings of the two purifiers are quite different, there may be dust accumulation on the sensor door. You can remove the sensor door to clean the dust. The colors of the air quality indicators of the two purifiers are different in the same environment. As mentioned above, due to the difference in PM2.5, the values detected by the two sensors are both near the critical value, one is above the critical value, and the other is at the critical value. Under the air quality indicator, the color of the air quality indicator is different.