H-PEM PM₁₀ and PM_2.5 Personal Impactor

Downloads

Download the latest version of the instruction manual Click here then click on manual 38.

View a dynamic presentation of the H-PEM assembly. (Adobe Acrobat Reader 8.0 req'd)

Download Data Sheet

Introduction

The BGI H-PEM is a development of the Environmental Science and Engineering Group at the Harvard School of Public Health. It is a group of four impactors designed to be worn on the person in order to closely gage their exposure to PM_2.5 or PM₁₀ concentrations at 2 different flow rates. This results in four models. What makes this set of instruments so unique and superior to similar devices is the bold use of Silicone grease to capture the unwanted particles. The bias caused by particle bounce and the very questionable results obtained when impacting solid particles upon dry surfaces is completely eliminated. The truth of the superiourity of these assertions is bourne out by the large numbers in use as demonstrated by over 100 web entries.

The ability to evaluate exposures to PM₁₀ and PM_2.5 is amply borne out by the emphasis placed upon these two measurands, worldwide. PM₁₀ is important in Air Pollution, IAQ and Industrial Hygiene. PM_2.5 is the premier measurement when considering Air Pollution expoesure as well as IAQ. It is not an offical Industrial exposure measurement, but it is increasingly being used because it is viewed as more stringent than a respirable measurement.

1 All of the diameters are applied to the unofficial area of Indoor Air Quality..
2 This diameter has gained widespread acceptance as a ‘critical value’ in several fields.
3 This diameter has no official status but is considered important with regard to aerosols of Diesel origin.

Variations

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^APressure drop is measured with Pall Teflo R2PJ 037 filter installed
^BPrecise laboratory measurement of single specimens

Each instrument is delivered configured for its individual D₅₀ cut and flow rate. All parts are redially available in order for the investigator to obtain parts suitable for a different cut or flow rate. A graphic display of how the unit is assembled and taken apart may be viewed. (Adobe Acrobat Reader v. 8.0 or higher required)