3、734.3+3 文献标志码:A 文章编号:1674–5124(2018)12–0051–04OptimisationandimprovementofcalibrationconductivitysensoroftheconductivitytemperatureanddepthmeasuringinstrumentsYAN Tian, LIANG Jie, ZHAO Donglei, QIAN Fei, LI Fan(South China Sea Standard and Metrology
4、Centre, Guangzhou 510715, China)Abstract: On the basis of indication error calibration of conductivity sensor of the conductivity temperatureand depth(CTD) measuring instruments, a fourth-order conductivity calibration equation with temperature andpressure correction is applied to calibrate the ind
5、icating value of conductivity of the conductivity sensor inseawater of 35 salinity. Meanwhile, applicability of this conductivity calibration equation in seawater of 33 and37 salinity is verified. The result shows that in seawater of 35 salinity, the conductivity calibration equation caneffectively
6、 calibrated the indicating value of conductivity of the conductivity sensor in different temperatures.After calibrated by the conductivity calibration equation, the maximum absolute indication error of theconductivity sensor is improved from 0.013 56 S/m and 0.012 57 S/m to 0.000 31 S/m and 0.000 9
7、0 S/mrespectively; in seawater of 33 and 37 salinity, the conductivity calibration equation is applicable. Theconductivity calibration equation can be effectively applied to calibrate conductivity sensor of