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What could cause a decreasing Acid Ratio on TD-700?
If the fluorometer lamp is failing or it is the incorrect type, it can dramatically change the acid ratio.  For example, a customer used a UV lamp in the TD-700 instead of a daylight white lamp.  The result was a 50% reduction in the acid ratio.  If a sudden change is noted in the acid ratio the first things to check are the lamp and filters.  Check to make sure that the excitation and emission filters are in the correct positions and that the lamp is on and it is the correct part number for your application.