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Do I adjust the sensitivity with a gain knob or switch?
There is no manual sensitivity or gain control mechanisms on the SCUFA. There are three gain settings (x100, x10, x1) on the fluorescence channel and two gain settings on the turbidity channel that are controlled automatically.  With analog output, the user has control over instrument range that will affect the gain settings available.  For example, by setting the 0-5V range to 0-20ppb, you will eliminate the need for the x1 gain setting.  To achieve optimal performance, the appropriate calibration standard should be used.  An optimal standard will be a standard with a concentration that represents 40-60% of the maximum concentration you will experience in the field.