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76 (104)
Revision 4
No. Parameter
Value
7.
(17) Firmware version
Displays current firmware version.
9.4.2
Parameter 1: Display unit
Parameter 1 is used to determine the unit that the device uses when it displays the measurement signal
level. See Table 21 for descriptions of the parameter values:
Table 21: Parameter 1 values
Value
Description
Display
000
Displays measurement range in %.
Default value.
0.0 ... 100.0 (%),
fixed decimal point
001
Displays output signal level in mA.
04.00 ... 20.00 (mA),
fixed decimal point
002
Displays dust concentration in mg/m
3
.
00.01 ... 999.9 ... 9999 (mg/m
3
),
floating decimal point
If the mA output is not properly connected and parameter value 001 is selected, the
display indicates “OL” for “Open Loop”. This means that the 4 ... 20 mA loop is not
closed.
The device indicates the currently selected measurement unit every 8 seconds by showing it on the
display for 2 seconds. For parameter value 000 the device displays “%”, for parameter value 001 it
displays “mA” and for 002 it displays “mg”.
9.4.3
Parameter 2: Signal averaging time
Signal averaging time refers to the period from which the device calculates the average signal level. For
example, with the default value of 50, the displayed measurement result is the moving average of the
past 50 seconds.
Signal averaging time cannot be changed with the local user interface. You must use
DustTool to change parameter 2 value.
9.4.4
Parameter 3: Measurement range
Parameter 3 value controls the maximum measurement range in relation to the baseline value that is
determined during Auto Setup. You can control the maximum dust concentration that the device can
detect before reaching the maximum output signal of 20 mA by changing the parameter value. This
scales the whole measurement range to the standard 4 ... 20 mA signal range.
