The D-CEM2100 is a dual-pass transmissometer configured for the measurement of opacity and dust concentration within the flue gas. Its unique optical arrangement provides continuous measurements of transmissivity of visible light across the flue in opposite directions, giving not only an accurate average of the dust loading within the duct, but also dynamic assessment of any mis-alignment errors which may occur due to duct movement.

The monitor incorporates integral automatic procedures for determining zero and span interfaces. Designed as a stand-alone dust monitor the instrument is supplied with a power supply, signal processor and local display/keypad to generate the relay and current outputs .