Continuous in-situ opacity or dust monitoring

January 2007 Analytical Instrumentation & Environmental Monitoring

Durag's D-R 290 monitor is designed for continuous in situ opacity or dust monitoring of flue gas in stacks and ductwork. It is ideally suited for systems firing coal, fuel oil or a mixture of fuels in converter plants, asphalt mixing plants and cement production plants.

The microprocessor-based monitor operates on the auto collimation (double pass) measuring principle. It has a measuring range from 0 to 200 mg/m³ up to 0 to 4000 mg/mª with a 1 m to 12 m path length. Programming is via the control display unit or remote bus interface while the measuring data is available as analog current or via the bus interface.

A photo-element alternately receives the measurement and comparison light beam. Switching between these, it proceeds through an electro-magnetically actuated rotary diaphragm. For check value compensation, comparative 2 s measurements occur every two minutes.

The D-R 290 is equipped with two analog measurement value outputs and each output 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. Opacity computation of the opacity at the stack outlet is possible by means of the stack correction factor.

Periodically, the monitor automatically performs a cycle check, measuring and indicating the zero point, the soiling of the optical boundary surfaces, as well as providing a reference value. Condensation and deposits are avoided on the signal lenses by the use of a heated pane.

Various options are available including bus interfaces, explosion-proof operation, automatic fail-safe shutters, and an additional on-stack display panel.

Durag is represented locally by OEN Enterprises.

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