FIELD: instrument making.
SUBSTANCE: invention relates to oil-and-gas industry and can be used to control efficiency of cathode protection of underground pipeline against corrosion. Proposed device comprises ferroprobe with first compensating winding, analog converter, phase detector and low-frequency filter connected in series, first current-to-voltage converter, analog-to-digital converter and excitation generator. Note that it additionally comprises second compensating winding. Analog converter comprises additionally output device, time interval shaper, indicator, keyboard, second selective amplifier and current-to-voltage converter, digital-to-analog converter and controlled switch.
EFFECT: additional measurement channel to measure cathode protection current continuously.
1 dwg
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