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very sensitive, and it minimizes the influence that sensor contamination, changes in process
temperature and flow velocity have on the measurement results.
Inductive electrification technology enables a detection limit of as low as 0.01 mg/m
3
.
3.5.1
Inductive Electrification Unit
The signal level generated by the device is measured in Inductive Electrification Units (IEU), and the IEU
value is converted to mA output signal that the device uses to communicate the dust level to the
monitoring system. The IEU value can be anything from a few hundred up to several million units, which
allows the relation between the IEU value and mA signal to be set very accurately.
The relation between the IEU value and mA output signal is established automatically with the Auto
Setup function. It is also possible to display the measurement results in mg/m
3
. However, in this case the
IEU value and output signal must be calibrated against a reference, for example the results of
gravimetric analysis.
3.5.2
Potential influences on measurement results
With the inductive electrification technology, the signal level shows the following behavior over the
measuring range:
•
Linear range
: Signal level increases linearly from the detection limit 0.01 mg/m
3
to several
hundred mg/m
3
.
•
Nonlinear range
: From linear range up to several g/m
3
.
•
Saturation
: After non-linear range. The signal level reaches saturation and no longer increases.
Figure 14: Uncalibrated measuring behavior
Many factors can affect the measuring range and behavior of the device. These factors include dust
material, particle size, flow velocity and installation environment.
Saturation
