Continuous opacity or dust monitoring

June 2005 Analytical Instrumentation & Environmental Monitoring

The Durag D-R 290 opacity monitor is designed 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, and any type of plant requiring quantitative monitoring of opacity or dust concentrations.

The device operates on the auto-collimation (double-pass) principle and measurements can be displayed as opacity or optical density. The light beam crosses the measurement path twice and the system measures the light attenuation from dust in the stack. The system generates light internally with a wideband light source to prevent distortions from sunlight or other sources. This LED also has a longer life span than traditional halogen lamps. The broad spectrum of emitted light means results are not distorted by temperature, ensuring a more stable measurement than a conventional narrow band LED.

The D-R 290 is equipped with two analog data outputs. Each output has an adjustable extinction or opacity range. Extinction measurements between 0,1 and 1,6 or opacity measurements from 20% to 100% can be selected. The opacity at the stack outlet can be computed using a correction factor for the D-R 290 system location. To ensure it is functioning properly, the D-R 290 performs a periodic check cycle of the zero value and window dirtying to generate the reference value. The D-R 290 will then correct subsequent measurements. If the corrections exceed the designated value, the system will notify the user. A heated plane within the system prevents condensation and deposits on the optics.

The standard system includes mounting flanges, measuring head, reflector, display and operating panel and a purge air fan. Optional accessories include explosion-proof execution with EEx-p protection, weather protection hoods when the instrument is mounted in an unprotected area, automatic fail-safe shutters to protect the measuring head and reflectors in the event of purge air outage, and bus interfaces such as Modbus or CANbus.

For more information contact Noel Bauchop, OEN Enterprises, 011 675 4447, [email protected], www.oenenterprises.co.za

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