The APM577M is a manual method for sampling very fine sub-micron particulates (PM1 fraction). This sampler is based on impactor design standardized by Indian Institute of Technology, Kanpur.
The air enters in the system through an omni-directional inlet designed to provide a clean, aerodynamic cut point for particles. The air sample & fine particulates exiting from the PM1 impactor are passed through a 47 mm diameter PTFE filter membrane that retains the sub-micron PM1 dust.
The sampling rate of the system is held constant at 10 LPM by a suitable critical orifice. A dry gas meter is incorporated to provide a direct measure of the total air volume sampled. Time totalizer provides information on actual run time of sampling. An electronic timer is also provided to start the sampling and shut off the sampler as per requirement of the sampling, thus eliminating the need of presence of man power at site.