• Measuring ranges 0-0,1...1,6 Ext or 0-20...100% opacity
• Can be calibrated to mg/m3: 0-300...5000 mg/m3 per meter measuring distance
• For measurement of opacity installation without calibration
• Measuring path length: 0,5 - 14 m
• Automatic soiling correction, automatic zero and control point check.
• Typical applications: smoke density measurement in heating plants, dust concentration measurement in flue gas of Power plants, Steel and Blast Furnace Plants, Cement Plants, Refineries etc.
• Compliant to US EPA regulations

The D-R 290 operates according to the principle of auto-collimation (double-pass). The light beam crosses the measuring path twice. The system measures and evaluates the attenuation of the light beam caused by the dust in the measuring path.

A photoelement alternately receives the measurement and comparison light beam. Switching between the measurement beam and a comparison light beam proceeds through an electro-magnetically actuated rotary diaphragm. For check value compensation, comparative measurements of 2 seconds in duration occur every 2 minutes. There is only 1 joint amplifier for the measuring and the comparator beams, thus compensating temperature influences as well as for amplifier long-term drift. The transmitted light is generated by a SWBD (Super Wide Band Diode) without the influence of other light sources, such as sunlight. An SWBD also has a long life span compared to traditional halogen lamps. Because of the broad band nature of the SWBD, the measurement results are not influenced by temperature or other factors. The use of the wide band diode also offers a more stable measurement than a conventional narrow band LED.

The DURAG D-R 290 Opacity and Dust Concentration Monitor is used for continuous opacity or dust monitoring of flue gas in stacks and ductwork. According to TA Luft and 13. and 27. BlmSchV the D-R 290 is suitable for

systems firing coal, fuel oil or a mixture of fuels

converter plants, asphalt mixing plants and cement production plants

any other type of plant requiring quantitative monitoring of opacity or dust concentrations.

Measured results can be displayed as opacity or optical density.

Meets all design requirements of the US EPA and EU