PRODUCT DESCRIPTION

The D-R 290 Dust Concentration and Opacity Monitor by the DURAG Group is used for continuous opacity or dust monitoring of flue gas in stacks and ductwork. 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.

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. 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 D-R 290 is equipped with two analog measurement value outputs. Each of the outputs has two selectable extinction or opacity ranges. The measurement ranges are selectable from 0.1 to 1.6 for extinction, and from 20 to 100% for opacity.

The D-R 290 has the option of Bus interfaces, Modbus, CAN bus, automatic fail safe shutters as a protection for the measuring head and reflector in case of an outage of the purge air, weather protection hoods when the instrument is mounted in an unprotected area and explosion proof execution with EEx-p protection methods possible.