TSI Instruments DustTrak 8535, Operation And Maintenance Manual

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Chapter 3
Operation
Overview
The DustTrak
™ Environmental Enclosure
can be used in conjunction
with the DustTra
k™
II and DustTra
k™
DRX aerosol monitor for many
different applications. Its primary use is in outdoor applications to give
the DustTra
k™ monitor protection from the elements and the ability to
sample efficiently in different wind speeds. The enclosure and
extended-life battery may also be advantageous in indoor industrial
applications, to provide additional security and protection to the
DustTra
k™ monitor
.
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
Heat Shield Assembly should be used. The Heat Shield Assembly
blocks the direct sunlight, keeping the temperature inside the
Environmental Enclosure cooler than it would otherwise be. Orient the
Environmental Enclosure with Heat Shield Assembly such that the
Heat Shield faces the sun directly when the sun is at its highest point
in the sky. This will maximize the effectiveness of the Heat Shield.