How to choose PM2.5 sensor in air purifier
The PM2.5 sensor is an important part of the air purifier. Its function is to monitor the indoor PM2.5 concentration and provide a working basis for the air purifier. Therefore, choosing the right PM2.5 sensor is crucial to the effectiveness of the air purifier.
When selecting, you need to consider the following factors:
●Measurement principle: PM2.5 sensors mainly have three measurement principles: Laser Dust Sensor, Infrared gas sensor, and circuit method. The laser method has the advantages of high measurement accuracy and wide measurement range, but the price is higher; the infrared method has the advantages of low cost, small size, and low power consumption, but the measurement accuracy is not as good as the laser method; the circuit method has the lowest cost and the most convenient use. Advantages, but poor measurement accuracy and measurement range.
●Measurement range: The measurement range of PM2.5 sensors is generally 0.1~10μm, of which 0.1~0.3μm is PM0.1, 0.3~1μm is PM1, and 0.1~1μm is PM2.5. The air purifier mainly needs to monitor PM2.5 concentration, so choose a sensor with a measurement range of 0.1~1μm.
● Sensitivity: Sensitivity refers to the coefficient between the sensor output signal and the concentration of the measured substance. The higher the sensitivity, the higher the measurement accuracy of the sensor.
● Stability: Stability refers to the sensor's ability to maintain stable measurement values during long-term use. The better the stability of the sensor, the more accurate the measurement results can be guaranteed.
● Repeatability: Repeatability refers to the consistency between the measured values obtained by measuring the concentration of the same analyte multiple times under the same conditions. The sensor with better repeatability can ensure the reliability of the measurement results.
Based on the above factors, air purifier PM2.5 sensors can be divided into the following categories:
● High precision, high stability, high repeatability, high price: suitable for occasions with high air quality requirements, such as hospitals, schools, kindergartens, etc.
● Medium accuracy, medium stability, medium repeatability, medium price: suitable for general homes and offices.
● Low precision, low stability, low repeatability, low price: suitable for general shopping malls, supermarkets, etc.
The specific type of sensor to choose needs to be comprehensively considered based on your actual needs and budget.
Here are some suggestions for selection:
● If you have high requirements for air quality, it is recommended to choose a sensor with high precision, high stability and high repeatability.
● If you have average air quality requirements, it is recommended to choose a sensor with medium accuracy, medium stability, and medium repeatability.
● If the air quality requirements are not high, it is recommended to choose a sensor with low accuracy, low stability, and low repeatability.
The air purifier PM2.5 sensor is an important part of the air purifier. When selecting, you need to consider a variety of factors to meet your actual needs.
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