A method includes registering a first mass flow rate portion measurement value ṁ.sub.1 of a first flow portion through measuring tubes of a first oscillator and a second mass flow rate portion measurement value ṁ.sub.2 of a second flow portion through measuring tubes of the second oscillator. A sum of the two mass flow rate portion measurement values gives a mass flow rate total measurement value. The method also includes registering first and second density portion measurement values ρ.sub.1, ρ.sub.2 of the medium in the flow portions and calculating the effective density measurement value ρ.sub.eff as a function of the density portion measurement values ρ.sub.1, ρ.sub.2 with weightings dependent on the mass flow rate portion measurement values ṁ.sub.1, ṁ.sub.2. The different weighting functions are applied for ascertaining the weightings as a function of the mass flow rate portion measurement values.

A coriolis flowmeter, comprising a measurement device inlet and a measurement device outlet for a fluid, at least one directly measuring direct measuring tube (8, 9) with at least one oscillation generator (25) and at least two oscillation sensors (26, 27), at least one indirectly measuring indirect measuring tube (10) with an indirect measuring tube outlet (23) and at least one flow divider (13) arranged downstream of the measurement device inlet and upstream of the at least one direct measuring tube (8, 9) and the at least one indirect measuring tube (10) in the flow direction, is characterized in that the at least one direct measuring tube (8, 9) opens directly or indirectly into the indirect measuring tube (10) or one of the indirect measuring tubes (10) upstream of the indirect measuring tube outlet (23) in the flow direction. A method for operating a coriolis throughflow measurement device is also proposed.

A multichannel flow tube (300) for a vibratory meter (5), and a method of manufacturing the multichannel flow tube are provided. The multichannel flow tube comprises a tube perimeter wall (304), a first channel division (302b), and a first support structure (308a). The first channel division is enclosed within and coupled to the tube perimeter wall, forming a first channel (306b) and a second channel (306c). The first support structure is coupled to the tube perimeter wall and the first channel division.

A vibratory meter (5), and methods of manufacturing the same are provided. The vibratory meter includes a pickoff, a driver, and a flow tube (700) comprising a tube perimeter wall with: a first substantially planar section (706a), a second substantially planar section (706b) coupled to the first substantially planar section to form a first angle θ.sub.1 (704), a third substantially planar section (706c), a fourth substantially planar section (706d), and a fifth substantially planar section (706e).

A Coriolis mass flow meter comprises a transformer circuit configured to receive and analyze vibration measurement signals to determine mass flow measurement values which represent a mass flow of a fluid and to determine characteristic number values for at least one sensor characteristic number, which characterizes and/or is based on at least one harmonic component of at least one of the vibration measurement signals, wherein each vibration measurement signal includes a useful component, having a frequency corresponding to a drive frequency with an amplitude based on a respective magnetic flux through a respective vibration sensor of the flow meter, and a harmonic component having a frequency corresponding to a whole-number multiple of the drive frequency and an amplitude based on the respective magnetic flux.

A measuring system includes a measuring and operation electronic unit (ME) and a transducer device electrically coupled thereto. The transducer device (MW) has at least one tube, through which fluid flows during operation and which is caused to vibrate meanwhile, a vibration exciter, two vibration sensors for generating vibration signals, and two temperature sensors for generating temperature measurement signals (θ1, θ2). The temperature sensors are coupled to a wall of the tube in a thermally conductive manner. The ME is designed to feed electrical power into the at least one vibration exciter to cause mechanical vibrations of the tube by an electrical excitation signal. The ME generates a mass flow sequence representing the instantaneous mass flow rate (m) of the fluid, so that, at least for a reference mass flow rate, the mass flow measurement values are independent of the temperature difference.

A measuring system comprises: a measuring transducer; transmitter electronics; at least one measuring tube; and at least one oscillation exciter. The transmitter electronics delivers a driver signal for the at least one oscillation exciter, and for feeding electrical, excitation power into the at least one oscillation exciter. The driver signal, has a sinusoidal signal component which corresponds to an instantaneous eigenfrequency, and in which the at least one measuring tube can execute, or executes, eigenoscillations about a resting position. The eigenoscillations have an oscillation node and in the region of the wanted, oscillatory length exactly one oscillatory antinode. The driver signal has, a sinusoidal signal component with a signal frequency, which deviates from each instantaneous eigenfrequency of each natural mode of oscillation of the at least one measuring tube, in each case, by more than 1 Hz and/or by more than 1% of said eigenfrequency.

A sensor assembly (100, 300) for a vibratory conduit (130a, 330) is provided. The sensor assembly (100, 300) includes a sensor bracket (110, 310) having an outer surface (112, 312) substantially symmetric about an axis (S) and including a complementary portion (112c, 312c). The sensor assembly (100, 300) also includes a tube ring (120, 220, 320) having an outer surface (122, 222, 322) including a complementary portion (122c, 222c, 322c) affixed to the complementary portion (112c, 312c) of the sensor bracket (110, 310). The axis (S) of the sensor bracket (110, 310) is external of the vibratory conduit (130a, 330) when the tube ring (120, 220, 320) is affixed to the vibratory conduit (130a, 330).

A MEMS sensor for measuring at least one measured variable, especially a density, a flow and/or a viscosity, a flowing fluid, is described, comprising: at least one microfluidic channel having a channel section excitable to execute oscillations; and an exciter system for exciting a desired oscillation mode, causing the channel section to execute oscillations in a predetermined plane of oscillation. The MEMS sensor has improved oscillation characteristics at least in part because the channel section is composed of an anisotropic material, having directionally dependent elasticity and which is spatially oriented such that a modulus of elasticity determinative for a stiffness of the channel section relative to deflections of the channel section perpendicular to the plane of oscillation is greater than a modulus of elasticity determinative for a stiffness of the channel section relative to deflections of the channel section in the plane of oscillation.

The measuring system comprises a transducer apparatus with two tubes, each having a lumen surrounded by a wall. A fluid flows through each tube, while the tube is vibrated. An electromechanical-exciter mechanism maintains mechanical oscillations of each of the tubes, and a sensor arrangement registers mechanical oscillations of at least one of the tubes. The transducer apparatus includes two temperature sensors, each being mechanically and thermally conductively coupled with a wall of a respective one of the tubes and adapted to register a measuring point temperature and to convert such into a temperature measurement signal. A measuring- and operating electronics is adapted, with application of the temperature measurement signals, to generate a transducer temperature measured value, which represents a transducer apparatus temperature, which deviates both from each of the measuring point temperatures, such that a magnitude of the transducer temperature measured value is between the measuring point temperatures.