METHOD OF CALIBRATION OF NUCLEAR-MAGNETIC FLOWMETER Russian patent published in 2017 - IPC G01F1/716 G01F25/00 

FIELD: physics.

SUBSTANCE: method of calibration of a nuclear-magnetic flowmeter (2) configured to flow a multiphase medium (3) through its measuring tube (4) connected to an inlet pipe (6) located in front of the measuring tube (4) in the direction (5) of the medium flow, and to the outlet pipe (7) located after the measuring tube (4) in the direction (5) of the medium flow. The bypass (8) is related to the measuring tube (4), to which the inlet valve (10) and/or the outlet valve (11), and the bypass pipe (9) are related, connected for calibration on one side with the inlet pipe (6), and on the other side - with the outlet pipe (7), namely through the inlet valve (10), or through the outlet valve (11), or through the inlet valve (10) and through the output valve (11), characterised in that in the mode of calibration of the flowmeter (2) medium (3), which passes in the measurement mode from the inlet pipe (6) through the inlet valve (10) of the bypass (8) into the measuring tube (3), and therefrom - through the outlet valve (11) of the bypass (8) into the outlet pipe (7) is guided from the inlet pipe (6) through the inlet valve (10) of the bypass (8) to the bypass pipe (9), and from there - through the output valve (11) of the bypass (8) into the outlet pipe (7), and measurements are made with the respect to the medium (3) standing in the measuring tube (4).

EFFECT: providing the most inconspicuous switching between the calibration and flow rate modes with minimal complication of the design and operation of the nuclear magnetic flowmeter, which is provided according to the invention by controlling the input and output valves so that they lock the medium in the measuring tube in calibration mode.

8 cl, 1 dwg