Rezumat
CZU 681.2./+543.08+543.55
DOI https://doi.org/10.52577/eom.2021.57.4.35
The process of the calibration of flow-through conductometric sensors of electrical conductivity and their concentration in solutions of NaOH, NaCl, Na2CO3 is investigated. Two-electrode sensors in glass tubes were used, with platinum electrodes in combination with the developed resistometer. The measuring system resisto-meter-sensor KSN-19, KSN-22, and KSN-23 operates on a pulsed alternating current with a frequency of 4 kHz. The calibration dependences of the concentration-resistance sensors in the indicated solutions were measured. Three main parameters of the sensors were determined by means of special software processing of the calibration data and their comparison with precise reference functions, namely, the “sensor constant” KS, KS1, and KS3. It is shown that all characteristic parameters of sensors depend on the chemical composition of the analyzed medium and are not constants. Theoretical substantiations of the observed regularity are given.
Keywords: conductometric sensor, electrical conductivity, calibration, sensor constant, ion mobility, resistometer.