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Revision 4
Figure 27: Relation between the output signal baseline and alarm thresholds after Auto Setup
①
Average output signal. Dust concentration baseline in the example is 10 mg/m
3
. Output
signal is around 4.8 mA, which represents 5% of measurement range.
②
Dust ALERT threshold at 25% of measurement range. ALERT is triggered when there is a 5×
increase in dust level compared to the baseline. In the example this corresponds to an
output signal of 8 mA and a dust concentration of 50 mg/m
3
.
③
Dust ALARM threshold at 100% of measurement range. ALARM is triggered when there is a
20× increase in dust level compared to the baseline. In the example this corresponds to an
output signal of 20 mA and a dust concentration of 200 mg/m
3
.
The actual dust concentration at the baseline depends on the location of the measurement point.