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 gauge their exposure to PM2.5 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 ability to evaluate exposures to PM10 and PM2.5 is amply borne out by the emphasis placed upon these two measurands, worldwide. PM10 is important in Air Pollution, IAQ and Industrial Hygiene. PM2.5 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.
| Name |
Diameter |
Field of Interest1 |
| PM10 |
10μm |
Environmental |
| Thoracic |
10μm |
Occupational Health |
| PM2.5 |
2.5μm |
Environmental2 |
| PM1 |
1μm |
Environmental3 |
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.
|
Catalog Number
|
Color
|
D
50Cut(μm) |
Flow Rate (lpm)
|
Pressure Drop
A,B
Cm of H2O
|
|
HP1040
|
Blue
|
10
|
4
|
3.32
|
|
HP2540
|
Red
|
2.5
|
4
|
4.89
|
|
HP1018
|
Blue
|
10
|
1.8
|
1.23
|
|
HP2518
|
Red
|
2.5
|
1.8
|
2.39
|
