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5.2
Particle size
In terms of particle size, 425µm (40 mesh) is generally defined as the limiting size to classify a material as a
"dust."
The minimum particle size which the Dumo is able to detect is 0.3 microns.
The best working range of the Dumo is between 1 and 200 microns.
5.3
Linearity, maximum concentrations, and calibration
The measuring range and the behavior of the Dumo depends on many factors, such as the dust material (as
explained in chapter 5.1 Influence of particle material), particle size, flow speed and installation location.
As an indication and averaging of different internal and external tests, Sintrol Products with Inductive
Electrification Technology show the following behavior over the measuring range:
Detection limit: 0.01 mg/m
Linear range: from detection limit to several hundred mg/m
Nonlinear range: from linear phase, up to several g/m
Saturation: after nonlinear range
To measure higher concentrations than 200 mg/m
behaviour we recommend performing reference measurements at the desired
concentration and add additional calibration points by using Sintrol
DustTool/calibration.
5.4
Influence of relative humidity RH %, condensation, and droplets in the measurement gas
Due to the working principle of the Dumo, the variation of relative humidity in the measurement gas only has
an insignificant effect on measurements
Condensate or droplets will be seen as dust particles and distort the measurement signal. A wrong signal will
be the consequence.
5.5
Influence of ambient temperature
As an indication and averaging of different internal and external tests, Sintrol Products with Inductive
Electrification Technology show very low influence of ambient temperature:
3
Figure 6: Illustration of un-calibrated measuring behavior
as long as there is no condensation or droplets
3
3
and it is critical to have a linear
3
.
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