The dust monitors are often separated in two categories :
And depending on the application, the two most advanced technologies / methods, may be used:
The table shows globally which method is preferred for which function, and which Fuji Electric dust monitoring equipment is required for precise measurement
Function / Method
A Light backscattering (LED optical technology)
B Inductive electrification (advanced triboelectric technology)
S305QAL or S304
When emission monitoring is concerned, i.e. a dust CEMS is required, both technologies may be selected.
And the choice will depend on the application specifications.
The next paragraphs explain in detail how to select the right dust monitoring devices according to the application.
The dust monitoring system is used to either detect solid particles, or quantify the concentration of solid particles in a gas flow.
Examples can be:
Process application: pneumatic conveying system monitoring.
This is the high and latest advancement of the old and famous “triboelectric” measurement method.
We explain the difference in the Fuji Electric S300 Series technical description.
The solid particles in many cases are flowing through a small diameter duct.
The inductive electrification dust monitoring equipment can be configured for both medium and small-diameter ducts.
When dust monitoring is used to measure the concentration of solid particles emitted to the atmosphere by a combustion process or any other industrial process, then both technologies may be used.
A dust monitoring system with inductive electrification technology is used when the flue gas stack diameter is small or medium size.
And according to other process specifications such as flue gas temperature and velocity, type and nature diversity of particles flowing, and type of filter used in the process … one or the other method will be selected.
The answer is No … but…
So, finally, YES the Fuji Electric S300 series dust monitors, using inductive electrification technology are used even when the particles are filtered by an ESP. The only case where it is not possible is when the S300 series dust monitor is located right downstream of the ESP. But in most cases, there are some distance and/or flue gas treatment processes between the ESP and the dust monitor, such as :
A dust monitoring system with LED backscattering technology is used when :
See more detailed explanation on Fuji Electric ZFDM-4 technical description.
In all other cases, the industrial operators are free to choose one or the other technology.