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When would I use a TD-700 with a red-sensitive PMT?
The red-sensitive PMT has a wider range of detection than the standard PMT.  The red-sensitive tube can detect fluorescence emission from 185 nm to 870 nm, while a standard tube detects fluorescence emission from 300 nm to 650 nm.  Certain analytes, such as BTEX and Chlorophyll a, fluoresce outside the range of the standard tube and require the red sensitive PMT.  If your analyte fluoresces between 185 and 300 nm or between 650 and 870 nm, you will require a red-sensitive PMT.