Coway AP-2021A Gray User Manual page 17

AIR QUALITY INDICATION GUIDE
Classification
PM2.5 (㎍/㎥)
Gas level
- PM2.5 concentration guide and color display criteria are based on the guide provided by the ministry
of environment and for the numeric expression of concentration, the company's algorithm is applied.
The product air quality level can be changed with the setpoint 7 levels (001: Sensitive +2,
002: Sensitive +1, 003: Sensitive, 004: Normal, 005: Insensitive, 006: Insensitive +1, 007: Insensitive +2).
- The 4-step air quality indicator is based on the worse measurement between PM2.5 and gas level.
- The concentration of dust displayed on the product measures the indoor environment real time,
so it may differ from the guide of the ministry of environment and may differ depending on the place
of use, the measurement method of the environment, etc.
- The maximum value of dust concentration displayed on the product is 500 ㎍/㎡.
- If the humidifier is operated near the purifier, the air quality measurement may rise.
- As the ultrasonic humidifier has large humidifying droplet particles, the dust sensor can recognize
them as dust, thereby causing a malfunction in the dust sensor. So use it away from the purifier.
- If the dust air quality continues to display the maximum number of 500, the sensor is contaminated.
Therefore, clean the air quality detector, turn off the power of the product and then turn on again so
that it can operate normally.
Good (Blue) Normal (Green)
0 ~ 15
1
Poor (Yellow)
16 ~ 35 36 ~ 75
2
How to use
Bad (Red)
76~
3 4
16