Principle Of Operation, Physical Effects, And Limitations; Influence Of Particle Material - ProDetec Sintrol Dumo User Manual

5 Principle of operation, physical effects, and limitations

Sintrol dust monitors are based on a unique Inductive
Electrification technology. The measurement is based on particles
interacting with an isolated probe mounted into the duct or stack.
When moving particles pass nearby or hit the probe a signal is
induced. This signal is then processed through a series of Sintrol's
advanced algorithms to filter out the noise and provide the most
accurate dust measurement output.
Classic triboelectric technology is based on the DC signal, which is
caused by particles contacting the sensor to transfer charges.
Compared to DC based measurements, the Inductive
Electrification technology is more sensitive and minimizes the
influence of sensor contamination, temperature drift and velocity
changes. By using the Inductive Electrification Technology it is possible to reach a detection limit as low as
0.01 mg/m3.
According to its position in the Triboelectric Table each material transfers a specific charge to the probe.
Inorganic, electro-conductive materials (metals) create the lowest signals, Inorganic dielectric materials
(cement, minerals) generate average signals, Organic dielectric materials (wood, flour) generate the highest
Signals. This charge is captured by our sensor and its signal level is proportional to the particle concentration.
As a unit for this signal level the Inductive Electrification Unit (IEU) is used.
The relation between Inductive Electrification Unit (IEU) and the mA output signal can be established by
performing the Auto Setup function.
The relation between Inductive Electrification Unit (IEU) and the dust concentration in mg/m
calibrating the signal to a reference method e.g. to the results of a gravimetric sampling series.
5.1

Influence of particle material

The signals transmitted by different types of dust particles can vary greatly from one material to the other. For
example:
Inorganic electro-conductive materials (metals) create the lowest signals.

Inorganic dielectric materials (cement, minerals) generate average signals.

Organic dielectric materials (wood, flour) generate the highest signals.

This means that at the same concentration, different types of dusts generate different output signals. For
example, this behavior can be compared to the behavior of opacity monitors, which show a different result
depending on the color of the material: at the same concentration, white dust will show less opacity than black
dust.
The initial measuring values transmitted by this measuring technology are relative
measurements and the Dumo must not be relocated without a proper re-installation and
setup.
Figure 5 Inductive Electrification Technology
3 can be done by
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