Chapter 3
aerosol is equivalent to “0.050 VDC.” If the instrument display shows
“0.018 mg/m
3
,” the analog output voltage would be “18 x 0.050 VDC”
or “0.9 VDC” (see Application Note ITI-073, for more specifications
and examples).
• Select the lowest range consistent with your desired application. For
example, if you typically measure aerosol mass concentrations around
0.025 mg/m
3
, you should use the first range. This will provide you with
the best resolution (strongest signal) corresponding to the mass
concentration.
• If your application involves high-mass concentrations (wood dust, etc.)
you may want to choose the second or third range.
• If the D
USTTRAK monitor measures mass concentrations that are greater
than the selected range, the analog voltage will “rail” at 5.0 volts
(maximum output; no change in signal beyond that point).
• All of the ranges are referenced back to “zero” mg/m
3
.
Alarm Output
Newer models of the D
USTTRAK Aerosol Monitor contain an alarm output
feature. This means the instrument is capable of providing an alarm signal
when the measured mass concentration exceeds a certain threshold.
Note: Before using this feature, it is important to read this operational
section. For further information, please see Application Note
ITI-074, which describes the Alarm Output programming and
operation. This Application Note is available at the TSI website,
http://www.tsi.com
.
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