FIELD: measurement technology. SUBSTANCE: concentration of slightly dissociated substance is found by conduction of solution which is measured with the use of high-frequency conductivity apparatus. Generator- amplifier of conductivity apparatus has positive coupling and feedback passing through solution. Distance between electrodes 2-4, 3-5 in circuit of positive coupling is less than between electrodes 2-3, 4-5 in circuit of feedback. EFFECT: capability to measure concentration of substance in complex solution. 1 dwg
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