The D-R 290 has been used successfully for more than 15 years in various applications as reliable and low maintenance opacity dust monitor. Now the new generation is available. The D-R 290 is a certified optical transmission monitor to measure the opacity or dust concentration of flue gases with medium to high dust concentrations. The D-R 290 operates using the double-pass method according to the auto-collimation principle. The light beam traverses the measuring path twice. The attenuation of the light beam by the dust content in the measuring section is measured and evaluated.

The D-R 290 has been used successfully for more than 15 years in various applications as reliable and low maintenance opacity dust monitor. Now the new generation is available. The D-R 290 is a certified optical transmission monitor to measure the opacity or dust concentration of flue gases with medium to high dust concentrations. The D-R 290 operates using the double-pass method according to the auto-collimation principle. The light beam traverses the measuring path twice. The attenuation of the light beam by the dust content in the measuring section is measured and evaluated.