MEASURING SYSTEM FOR MEASUREMENT OF DENSITY AND/OR NORM OF MASS FLOW RATE AND/OR VISCOSITY OF FLUID ENVIRONMENT PROCEEDING IN PIPELINE AND USE OF MEASURING SYSTEM

摘要

FIELD: instrumentation.;SUBSTANCE: invention relates to devices for measurement of density and/or norm of mass flow rate of the medium flowing in a pipeline. The measuring system comprises for this purpose a vibration type transducer for generation of oscillatory measuring signals, an electronic converter electrically connected to the transducer for setup of the transducer and for processing of the oscillatory measuring signals supplied by the transducer. The transducer has a converter housing (7₁) the housing end of which from the inlet size is formed by means of a flow divider (20₁) with exactly four spaced flowing holes (20_1A, 20_1B, 20_1C, 20_1D) from the inlet side; the housing end from the outlet side is formed by means of a flow divider (20₂) with exactly four spaced flowing holes (20_2A, 20_2B, 20_2C, 20_2D) from the outlet side; exactly four, at forming of hydraulically parallel connected flow paths, measuring pipes (18₁, 18₂, 18₃, 18₄) connected to flow dividers (20₁, 20₂) for guiding of the flow medium; an electromechanical excitement device (5) formed by means of the first oscillation activator (5₁) for generation and/or sustaining of mechanical oscillations of four measuring pipes (18₁, 18₂, 18₃, 18₄) which also reacts to vibrations of the measuring pipes (18₁, 18₂, 18₃, 18₄), the device (19) of vibration sensors for generation of self-expressing vibrations of the measuring pipes (18₁, 18₂, 18₃, 18₄) of oscillatory measuring signals. The electronic converter has an exciting circuit for the excitement device and the measuring circuit which, when using at least of one oscillatory measuring signal supplied from the device of vibration sensors generates the measured density value, expressing by itself the medium density and/or the measured value of mass flow rate expressing by itself the norm of mass flow rate. For generation of the measured density value and/or the measured value of mass flow rate the measuring circuit of the measuring system according to the invention corrects the change of at least one characteristic parameter of the oscillatory measuring signals supplied from the transducer. The named changes can be caused by change of state of voltage in the transducer and/or deviation of state of voltage in the transducer at the given moment from the voltage pre-set for this reference state.;EFFECT: creation of the system with vibration type transducer which at big norms of mass flow rate causes insignificant pressure losses.;86 cl, 9 dwg