APM 550 EL Respirable Dust Sampler

he APM 550 system is a manual method for sampling fine particles (PM2.5 fraction). Ambient air enters the APM 550 series samplers system through an omni-directional inlet designed to provide a clean aerodynamic cut-point for particles greater than 10 microns. Particles in the air stream finer than 10 microns proceed to a second impactor that has an aerodynamic cut-point at 2.5 microns. The air sample and fine particulates exiting from the PM2.5 impactor are passed through a 47mm diameter Teflon filter membrane that retains the fine particulate matter
APM 550 EL keeps the sampling rate constant at 1m3hr by a microprocessor based electronic flow controller that automatically compensates for increasing pressure drop due to dust deposit on the filter. An ambient air temperature sensor and barometric pressure sensor have been provided to automatically provide temperature and pressure correction while reporting flow rate in volumetric flow units. An additional filter pressure sensor is also provided to continuously monitor and record the filter pressure and the system terminates the sample collection if the pressure drop across the filter exceeds a safe limit.
The APM 550 EL has an in-built USB Flash memory based data logger that records Filter ID, air temperature, filter temperature, barometric pressure, flow rate, Coefficient of Variation (CV) and also totalizes and records the volume of air sampled. A PC based software is provided to download the data for audit and prepare an intelligent report highlighting all important information in a convenient graphical format.