FLUORESCENT TRACING IN PROCESS CONTROL

[project topics]

Fluorescent tracing is based on a simple measurement concept. Inert chemical tracers are mixed, at a known specified level, with the water treatment chemicals. The tracer material is used at a low concentration in the sys- tem, generally in the range of parts per million down to parts per trillion. Remaining inert, the tracer does not react with any of the other chemicals in the water and does not change the treatment program’s activity. A sidestream of recirculating cooling water is then piped through a flow cell containing a microprocessor- based fluorometer. Light of a specific wavelength passes through a flow cell, exciting the tracer com- pound and allowing its emissions to be read by a de- tector. The resultant signal is sent to the microproces- sor, which determines the concentration of the tracer, with dosages that can range down to a few parts per billion to parts per trillion, depending on the tracer compounds used. Since the ratio of the tracer to chem- ical inhibitor is known, this provides a measure of in- hibitor concentration in the system.


reference:
http://aicheuploadedFiles/CEP/Issues/040266.pdf
http://distrilabparticlesfilters/pdf/Bul120'A'%20FluorPoly.pdf