Operation
If desired, the DUSTTRAK RJ45 cable may be attached directly to the inside
of the DB9 connector located on the side of the Environmental Enclosure. A
serial cable (not supplied) may then be attached from the outside of the DB9
connector to the computer COM port.
Note: In order to download a data file the D
USTTRAK monitor cannot be
in a sampling mode.
The primary use for the external DB9 connector is to facilitate real-time data
monitoring. An external computer or data logger can be directly attached to
the D
USTTRAK monitor, while still keeping the instrument inside its
weatherproof enclosure. The D
USTTRAK monitor can be queried through a
set of ASCII commands to provide periodic information.
Zeroing the DUSTTRAK Aerosol Monitor
The D
USTTRAK monitor should always be zeroed before beginning a
sample. See the instructions in Chapter 3
of this manual for more
information. If possible, the instrument should be zeroed under stable
ambient temperature conditions (since variations in temperature will have a
small impact upon the D
USTTRAK monitor readings). If this is not possible
(for example, 24-hour outdoor sampling, with wide temperature swings) the
instrument should be kept closed inside the Environmental Enclosure. The
thermal mass of the Enclosure will dampen out the affect of temperature
swings, radiant heat, etc.
Note: See the D
USTTRAK monitor Specifications in Appendix A for more
information on the temperature dependence.
In nearly all cases, the temperature impact upon the D
USTTRAK monitor
reading is very small in comparison to the ambient particle concentration.
Setting the Flow Rate
The aerosol inlet on the Environmental Enclosure was designed to operate at
a 1.7 liters/minute flow rate. Before each sample, the flow rate should be
verified and/or adjusted as described in the D
USTTRAK monitor Maintenance
section (Chapter 4
).
Locking the Environmental Enclosure
To avoid theft of the D
USTTRAK monitor, when left inside the Environmental
Enclosure, a padlock should be used to lock the box. There are two holes on
the front of the box that allow for a standard padlock to be attached. A
padlock is not supplied with the 8520-1.
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