Can the ADPD188BI be used for PM2.5
PM2.5 is a measurement of the mass of particles less than 2.5 µm in diameter, expressed in µg/m3. The measurement can be performed using either optical means or mechanical means.
An optical system involves using a laser based scattering system that counts and sizes individual particles under a defined air flow. Then the mass of each particle less than 2.5 µm is estimated and summed within the known volume.
In a mechanical system, a volume of air is directed against an impactor plate which collects particles above a particular size, while smaller particles continue through the system possibly to additional impactor plates. The mass change on the impactor plate is then measured.
The ADPD188BI cannot count individual particles, but can estimate the total signal from all particles within the measurement volume and estimate the mean particle size. This is not a strict PM2.5 measurement, but for many applications can yield equivalent information.