TSI Instruments DustTrak 8540, Operation And Service Manual

Page: 48 / 78

Chapter 4 38
STEL Alarm
STEL stands for S hort T erm E xposure L imit. When a STEL alarm is
selected, the instrument will inspect the data on a second by second
basis, independent from the selected logging interval. If the mass
exceeds the STEL limit, a STEL event triggers and the following
actions will be taken.
Data Data will be taken of the STEL alarm channel
at a 1 minute logging interval for
15 minutes .
This data will be stored in a separate file
named STEL_XXX, where XXX will be
matched to the logged data file.
The instrument will also continue to log the
mass concentration data at the logging
interval selected.
STEL Alarm repeat If the instrument remains over the STEL limit
after the 15 minute interval, or if the
instrument exceeds the STEL limit later
during the sample period, additional STEL
files will be generated.
STEL Data can be downloaded in TrakPro
™ software similar to the
standard data.