Different from DMS-100, DMS-200 is installed on the probe, access to the flue pipe through the probe directly to realize flue dust measurement, so it is possible to achieve very low detection limits. It is widely used in dust monitor of thermal power generation and other ultra-low emissions industries.
DMS-200 uses laser forward scattering principle to detect the dust concentration in the measured chimney. Detection principle illustrated as below:
The modulated laser irradiates dust particles in the flue to emit scattering light. Lens in front of laser collects the forward scattered light fiber into the high-temperature-resistant fibers and then the optical signal is transmitted to the detector, been analyzed and processed by the signal processing unit.The intensity of the scattered light is proportional to the concentration of particulate matter, and the detector signal current can be converted characteristically to the concentration of flue dust.