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UV254nm is the total amount of light, at a frequency of 254nm absorbed by dissolved and undissolved components within the sample. SAC is the Spectral Absorption Coefficient of the sample and is performed on a filtered sample to 0.45 micron as defined by DIN38 404 and EN ISO 7887:1994.
PPM represents a number of companies manufacturing optical sensor technology including SAC measurement. TriOS, Realtech and HF Scientific have various instruments for in line and portable measurement.
For more information on UV254nm/SAC - UV Absorption talk to Pollution & Process Monitoring Ltd
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