METHOD AND DEVICE FOR DETERMINING CONSUMPTION IN LARGE DIAMETER PIPELINES Russian patent published in 2018 - IPC G01F1/58 

FIELD: measuring equipment.

SUBSTANCE: invention relates to the field of measurement equipment and can be used to determine the flow of electrically conductive liquid media by means of an electromagnetic flowmeter with dip sensors of local velocity. Device includes current driver, current sensor based on mounting precision resistor and passive filter on chip resistors, four-key button keyboard. Method for determination of flow in large diameter pipelines ≥ 300 mm consists of measuring the local flow rate of controlled liquid at three points, which are located at fixed depth of immersion, by exciting alternating sign geomagnetic field, generating an information signal from the measured EMF value, determining the value of local and average velocity, and volume flow rate. Proposed device and method allows to increase the accuracy, stability, as well as to expand the dynamic range of measuring the flow rate of liquid in large diameter pipelines due to the method of processing information signals using the method of forming informative difference signal. To protect the device from external electromagnetic interference, internal common mode and ground currents, the common power lead of the device is isolated from local protective earth. To increase the accuracy of measurements of local velocity of controlled flow of liquid and to reduce the cost, simple method of statistical processing is used, which can be implemented in inexpensive microprocessor used in the claimed device. For example, the method of averaging out except emissions, by which the maximum and minimum values of digitized information signal are discarded, remaining n-2 values of this signal are averaged, and the value of digitized information signal obtained after averaging out is stored in operating storage of the device and used in further calculations.

EFFECT: increase the accuracy of measuring the flow of electroconductive liquid, save energy and expand the field of application.

2 cl, 5 dwg