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Model 4500 Premier Dust and Opacity Monitor
93
C3
Physical Principles
C3-1 General Description
The Land Instruments International Model 4500 Premier Continuous Opacity Monitoring System (COMS)
measures opacity by shining a light beam through flue gases. An internal microprocessor calculates
opacity, dust density and other parameters. The instrument comprises the following parts: The Transceiver
which contains all of the optical and electro–optic components; the Retro-Reflector containing a glass or
plastic retro-refector; the Termination Box where the customer terminations are located; and the air
purge system. A data display Control Room Unit is available.
The air purge system can take several forms depending upon individual site requirements. Single and
dual electric blowers are available, as are compressed-air driven devices. Continuous purge air supply
is essential to prevent dust and corrosive gases from affecting the optical system. Automatic fail–safe
shutters can also be fitted for temporary protection in the event of a purge air failure.
The entire system is designed for continuous operation in all weather conditions, with minimal
maintenance.
Control Room Unit
Retro-Reflector
Termination Box
Transceiver
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