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If Auto Setup has not been performed, the display indicates “3 - - -” when this
parameter is selected.
Table 22: Parameter 3 values
Value range (%)
Description
Default
000 ... 999
Increases or decreases the maximum dust
concentration at 20 mA output signal.
100
With the default value, the device can detect a 20× increase in the dust level in relation to the baseline
before reaching 20 mA signal level. This represents 100% of the default measurement range.
The maximum range determined with parameter 3 is always calculated from the
baseline value. In practice, parameter 3 value sets a multiplier for how much the dust
concentration can increase before the output signal reaches 20 mA.
See Table 23 for examples on how changing the parameter value affects the measurement range:
Table 23: Examples of adjusting the measurement range with parameter 3
Value (%)
Description
Dust level at 20 mA
050
Halves the measurement range
10× baseline
100
Default value
20× baseline
200
Doubles the measurement range
40× baseline
After adjusting the measurement range, the device automatically performs
zero/span check.
Adjusting the measurement range does not change the dust concentrations required to
trigger ALERT and ALARM statuses. Instead, it adjusts parameter 4 and 5 values in
relation to the new maximum range. For example, doubling the measurement range
with parameter 3 halves the values of parameters 4 and 5.
For detailed information on the default measurement range and signal levels, see section
chapter
Commissioning and system setup
9.4.5
Parameter 4: ALERT threshold
Parameter 4 controls the relation between the maximum measurement range (adjusted with
parameter 3) and the ALERT status threshold. Parameter value corresponds to the signal level required
to trigger the ALERT status.
