Issue << content << Electrical Conductivity Measurement Non-Ferrous Metal: Instruments and Metrological Assurance

DOI: 10.12737/article_599da33c481748.59586024

2017. Vol.20. No. 3, pp. 54–57

Electrical Conductivity Measurement Non-Ferrous Metal: Instruments and Metrological Assurance

P. V. Solomenchuk, N. I. Smirnova

4 state-of-the-art records on eddy current meters of specific conductivity are included in the state register of measuring instruments of the Russian Federation: Constanta K6, Sigmascope SMP10, WE-27NC, Wichr-AM. A feature of the last two meters is the start-up algorithm, implying starting calibration on samples. The temperature of the meters and samples should also be taken into account. A special feature of Sigmascope SMP10 is the built-in temperature sensor, which makes it possible to compensate for the change in the specific conductivity of the monitoring object when its temperature is changed by the built-in algorithm. It should be taken into account that the temperature coefficients of specific conductivity of alloys of different groups differ and can not be calculated on the basis of their specific conductivity content. Constanta K6is equipped with a large number of narrowly specialized transducers for measuring specific conductivity.
To the two primary standards - NIST national standard (USA) and NPL AC conductivity standard (UK) - used everywhere, the traceability of the majority of foreign specific conductivity measures is provided, the assignment of which is carried out using the eddy current phase method. In the Russian Federation, measures SO-230 are issued, the assignment of which is based on the van der Pau theorem, traceability of measures to primary standards of electrical resistance and length is ensured.
Conclusions. To ensure the reliability of measurement of foreign specific conductivity with the use of eddy current meters, it is necessary to take into account the features of their design and operation algorithms. Verification of eddy current gauges should be carried out using measure СО-230, with a basic relative error of ± 1% and traceability to primary measurement standards specific conductivity and length without the use of a primary specific conductivity reference standard.
Keywords: electrical conductivity, eddy current, accuracy of measurements, conductivity standards.


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