CTD-N Technical Manual
P/N 95F-6000-00 (February 2017)
page 85
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
APPENDIX A:
Measured and Calculated Parameters
Conductivity, temperature, and pressure are measured directly by the CTD-N. In addition, the in-
strument calculates salinity and sound velocity. All these parameters are recorded to internal
memory along with the time and date and the battery voltage for each sample, and they are re-
trieved when downloading the data from the instrument and saving the data to a file. When export-
ing the saved data to a text or spreadsheet file, or to CTDPost, CTDPro can calculate additional pa-
rameters from the measured parameters. Any combination of the measured and calculated parame-
ters, including those calculated by CTDPro, can be exported. (See
tions on how to export data to a file.)
Parameters Measured by the CTD-N
The parameters directly measured by the CTD-N are the following:
Conductivity:
The measured water conductivity in mS/cm.
Temperature:
The measured water temperature in °C.
Pressure:
The measured water pressure in dbars.
Battery Voltage:
The measured battery voltage in volts.
Parameters Calculated by the CTD-N
The parameters calculated by the CTD-N are following:
Salinity:
The seawater salinity in accordance to PSS78 (Practical Salinity
Scale 1978).
Sound Velocity:
The sound velocity in water in m/sec.
Time and Date:
The time in hours, minutes and seconds, and the date in month,
day and year on which the selected parameters are output and
stored for each sample.
