Operation
If the programmed start time/date has already passed, pressing the
SAMPLE key has no effect. The program will never execute.
It is always best to enter both a start time and start date! However,
setting the start time but no start date causes the D
USTTRAK monitor to
start at the specified time regardless of the date. The instrument may not
shut down prior to beginning logging.
If no start time is set, the D
USTTRAK monitor waits for you to press the
SAMPLE key and then starts sampling immediately.
If no test length is set, the D
USTTRAK monitor takes samples continuously
until the SAMPLE key is pressed to stop sampling or until memory is full.
When a pre-programmed test ends, the D
USTTRAK monitor automatically
shuts off.
Memory Considerations
The D
USTTRAK monitor has a great deal of memory and you will not
normally have to be concerned with running out. The D
USTTRAK monitor
can store more than 31,000 data points. Therefore 1% of memory is about
310 data points.
This should be considered when selecting a logging interval. Shorter logging
intervals use memory more quickly than longer intervals.
The logging interval and the available memory determine the maximum
possible duration of a data logging session. The equation below can be used
to determine any memory, recording time or logging interval restraints.
[ ]
[ ] [ ]
Interval Logging315
Time Elapsed
Memory%
×
≈
(Note: Elapsed Time and Logging Interval are in units of minutes.)
Custom Calibrations
In most situations, the D
USTTRAK monitor with its built-in data logger can
provide very good information on how the concentration of an aerosol
changes for different processes over time. Factory calibration to the
respirable fraction of standard ISO 12103-1, A1 test dust (formerly Arizona
Test Dust) allows comparisons between measurements where the source or
type of dust is predominately the same. Because optical mass measurements
are dependent upon particle size and material properties, there may be times
in which a custom calibration would improve your accuracy for a specific
aerosol.
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