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The detection and measurement of suspended solids is a desirable control input for a variety of industrial processes. Typical applications are found in purity control of incoming water or reagents, control of crystallization or polymerization processes, control of cleaning cycles for vessels or pipes, filter control to initiate back wash cycles or to detect break through and sedimentation and oil/water separation in the waste water treatment area. Optical sensors that utilize backscatter or absorption by the suspended matter have been proven to be reliable.However specific requirements have to be fulfilled by the sensor to withstand the harsh industrial environment: High pressure and high temperature installation can be overcome with remote fiber optic connections, accessibility to the sensor can be enabled with retractable holders, coating and soiling of he optics should be compensated through multi beam technology to avoid moving parts like wipers. A design of a suspended solids sensor should also allow for an installation in hazardous areas.
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