The online monitoring system of low concentration dust, DCEM3000, is a kind of on-line monitoring system of extremely low concentration dust. 

The measurement scheme of smoke extraction combined with laser scattering is adopted. It is specially used for the condition of high moisture content and low dust content in flue, with low detection limit and accurate measurement. 

It is suitable for flue gas with low temperature and high humidity after super clean discharge and wet desulphurization.