Abstract
The factors determining combined standard uncertainty (CSU) in the calibration of precision CTD probes conductivity sensors are considered. Calculation of standard uncertainties (SU) of individual components is done and analysis of their contribution into CSU calibrations of conductivity sensors of five basic models CTD-probes «Sea Bird» is done. It is shown that expanded CSU calibration of conductivity sensors of CTD-probes reviewed models at any points in the range from 53 mS/cm till 27 mS/ cm will not exceed (2.2÷1.0)·10 –3 mS/сm; relative extended CSU calibration of these sensors will not exceed 4.2·10 –5 and will be determined by CSU value of reference conductivity cell calibration. Expanded CSU of salinity US determination according to СТp measurements dat at coverage factor К=2 will be equal to 0.0031÷0.0034 upon contribution of CTD-probe CSU calibration at the level 0,0007÷0,0010 for 31≤S≤39; –2≤T≤25 °С; 27≤С≤53 mS/cm and 0≤р≤10000 dbar. According to experimental data the characteristics of sensitivity coefficient ∂f/∂С dependencies of standard deviations of input frequency s( f i ) and sensor readings s(Cз i ) from sea water electrical conductivity are calculated. Analysis of calibration characteristics of conductivity sensors temporal drift between calibrations is conducted.
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