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Dust/opacity monitor

Issue 8 and Volume 101.

Dust/opacity monitor

The Model 4500 mkII continuous opacity monitoring system (COMS) is designed to meet the demands for continuous stack monitoring without the need of a control room processor. The COMS uses the double-pass transmissometry technique but adopts a unique method to minimize drift. The high-intensity green LED light source has been specifically selected to give a longer life than conventional lamps operating at a peak wavelength of 565 nm and results in a near photopic response. The design also avoids any continuous moving parts and is a low-maintenance item.

Land Combustion

Circle 136