Dust monitors

DynOptic dust monitors use the innovative Dynamic Detection Principle (DDP) to measure dust and particulate within exhaust gases from various manufacturing processes.

DDP graphDDP, or optical scintillation as it sometimes referred to, measures the dynamic fluctuation in light transmission as dust particles move through a light beam. This dynamic fluctuation derives from temporal distributions of the dust particles which attenuate the light beam. The more dust present in the exhaust, the greater the amplitude of these fluctuations.

DDP instruments calculate the dynamic response, or the ratio of light variation to light intensity, which for particular applications, is proportional to dust concentration and when calibrated against standard reference measurements, this can be presented as a reading in mg/m³.

Unlike the standard transmission technique, DDP has immunity to gradual reductions in the absolute intensity of the light signal. Therefore, DDP instruments have the advantage that they are significantly less susceptible to drift with time, temperature or dirtying optics, than traditional opacity monitors and less sensitive to misalignment. In practice, this means that the instruments require less maintenance.

 

DynOptic currently offers two dust monitors using the DDP technique:

DSL-240 MkIII Single Pass Dust Monitor

DSL-340 MkIII Double Pass Dust Monitor

In order to determine whether DDP is suited to your application, it is necessary to consider a number of factors such as the typical size distribution of the particulates to be measured, whether they have constant or variable physical properties and the ease of which the heads can be accessed for routine cleaning of the optical surfaces. The following table summarises the key requirements for using DDP as compared to the more traditional opacity monitors.

Parameter

DDP

Opacity

Optimum particle diameter (mean of the particle diameter mass distribution)

>10μm

<1μm

Dependence on optical properties of the particles

Low

High

Dependence on optical surface contamination

Low

High

Dependence on noise pick-up (optical or electrical)

High

Low

Dependence on gas flow velocity

High (<3m/s)
Low (>3m/s)

Low

 

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DynOptic Systems

DSL-240MKIII
DSL-240 MkIII – popular single pass DDP dust monitor for measuring large diameter particulate density (mg/m³) in cement, steel and wood processes.
DSL-460MKII
DSL-460 MkII - advanced double pass instrument for monitoring visible opacity (0 – 100 %) and/or particulate density (mg/m³) in combustion and air filtration processes.
DSL-320MKIII
DSL-320 MkIII – classic double pass opacity monitor for measuring visible opacity (0 – 100 %) in combustion and air filtration processes.