MEASURING SYSTEM HAVING A MEASURING TRANSDUCER OF VIBRATION-TYPE

摘要

The invention relates to a measurement system for measuring the density and/or mass flow rate of a medium flowing at least intermittently in a pipeline. The measurement system comprises a vibration-type measurement sensor for generating vibratory measurement signals and transducer electronics, which are electrically coupled to the measurement sensor, intended to actuate the measurement sensor and to analyze vibration measurement signals provided by the measuring transducer. The measurement sensor comprises a sensor housing (71) by which an inlet housing end is formed by means of an inlet side flow divider (201) comprising exactly four flow openings (201A, 201B, 201C, 201D) spaced apart from each other and an outlet housing end is formed by means of an outlet side flow divider (202) comprising exactly four flow openings (202A, 202B, 202C, 202D) spaced apart from each other, exactly four measurement tubes (181, 182, 183, 184) connected to the flow dividers (201, 202) and forming flow paths fluidically connected in parallel for carrying flowing medium, an electromechanical exciter arrangement (5) formed by means of a first vibrational exciter (51) for generating and/or maintaining mechanical vibrations of the four measurement tubes (181, 182, 183, 184), and a vibration sensor arrangement (19) reacting to vibrations of the measurement tubes (181, 182, 183, 184) for generating vibrational signals representing vibrations of the measurement tubes (181, 182, 183, 184). The transducer electronics in turn comprise a driver circuit for the exciter arrangement and a measurement circuit generating a measured density value representing the density of the medium by using at least one of the vibration measurement signals provided by the vibration sensor arrangement and/or a measured mass flow value representing the mass flow value. In order to generate the measured density value and/or the measured mass flow value, the measurement circuit of the measurement system according to the invention corrects a change of at least one characteristic parameter of the measured vibration signals provided by the measuring transducer. Said changes can also be caused by a change of a voltage condition in the measurement sensor and/or a deviation of a momentary voltage condition in the measurement sensor from a reference voltage condition prescribed therefor.