998-2300 Rev. H Page 41
Once calibration is complete, click the Log Setup tab to set the logging start time &
logging interval. Click enable datalog, wait for C-Soft to automatically shutdown,
and disconnect power. As soon as power is re-supplied to the C3 via the C-Series
Analog Adapter it will automatically begin data output after 90 seconds, or pre-
configured start time, at the set interval.
Analog Output
The C-Series Analog Adapter converts digital data to voltage to help users integrate
our in situ fluorometers with almost any CTD, third party system, or data logger that
accepts a 0-5 volt signal. Below are two ways to interpret voltage output based on
the C3’s setup.
Reading the Voltage Output for RFUB Calibrated C3’s
The voltage output from the C3 Submersible Fluorometer via the C-Series Analog
Adapter needs to be blank-corrected. Users can standardize the voltage signal
using a standard of known concentration to convert RFUB to direct concentrations.
Reading the Voltage Output for Specific Range Calibrated C3’s
The voltage output from the C3 Submersible Fluorometer via the C-Series Analog
Adapter needs to be blank-corrected. The voltage output reflects direct
concentrations re-scaled to 0-5 volts.
Example, if your measured voltage for a given sample is 2.567 volts and the blank
voltage is 0.067 volts, your blank subtracted voltage is 2.5 volts.
[(2.5 volts) / (5 volts)] = 0.5
If your range maximum equals 100 µg/L, then (0.5 * 100 µg/L) = 50 µg/L. Therefore,
a sample that measures 2.567 volts = 50 µg/L.
Actual Concentration = (blank subtracted voltage)
(5 volts)
x (concentration at 5 volts)
Actual Concentration = (blank subtracted voltage)
(5 volts)
x (concentration at 5 volts)
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