27
Chapter 4
Operation
Overview
The Environmental Enclosure
can be used in conjunction with the
8540, 8540-M, 8542-M, 8543, or 8543-M Environmental DustTrak
aerosol
monitor for many different applications. Its primary use is in
outdoor applications to give the DustTrak monitor protection from the
elements and the ability to sample efficiently in different wind speeds.
How to Properly Orient the Environmental Enclosure
Set up the Environmental Enclosure in a location where it can sample
the particles of interest. It should be placed “out in the open,” away
from obstructions which may affect wind currents. For example, do
not place it at the corner of a building, which would cause swirling
wind currents and result in poor particle sampling.
Use the Environmental Enclosure in wind conditions with speeds of
22 mph or less to obtain the most accurate readings. An increase in
wind speed over 22 mph can decrease the sampling efficiency of the
inlet to under the efficiency specified by PM
10
standards. If wind gusts
of over 22 mph are present, the data collected is still valid, but be
aware that the readings will be slightly lower than the actual mass
concentration of aerosol present.
If the Environmental Enclosure is exposed to direct sunlight, causing
the temperature inside to approach the operating limit of 50°C, the
Solar Shield should be used. The Solar Shield blocks the direct
sunlight, keeping the temperature inside the Environmental Enclosure
cooler than it would otherwise be. Orient the Environmental Enclosure
with Solar Shield such that the Solar Shield faces the sun directly
when the sun is at its highest point in the sky. This will maximize the
effectiveness of the Solar Shield.
Summary of Contents for DUSTTRAK 854030
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