For industrial stacks

D-R 290 Opacity and Dust monitor

Reliable measurements for medium to high concentrations

The D-R 290 Opacity and Dust monitor has been used successfully for more than 15 years in various applications. 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 then measured and evaluated. The light source is a super-wide band diode (SWBD) which provides more stable measurements in comparison to conventional LEDs. Moreover, the D-R 290 has an internal zero and reference point check as well as contamination measurement. Therefore contamination is automatically compensated and a maintenance demand is immediately indicated.