MICRO MOTION, INC.

A magnetic flowmeter includes a flow tube assembly, an electromotive force (EMF) sensor, a power amplifier, a current sampling circuit, and a controller. The flow tube assembly receives the fluid flow, and includes a coil configured to receive a coil current and induce an EMF in the fluid flow that is proportional to the flow rate. The EMF sensor generates an output indicating the induced EMF. The power amplifier is configured to generate unfiltered current pulses at a first frequency. The power amplifier includes a low pass filter that attenuates the unfiltered current pulses to form coil current pulses at a second frequency that form the coil current. The current sampling circuit samples the coil current pulses at a sampling frequency. The controller is configured to change a relationship between the sampling frequency and the first frequency, and adjust the coil current based on the samples.

A magnetic flow meter includes electrode sensors generating a sensor signal indicative of flow of a liquid through a conduit. A noise identification module identifies a noise level in the sensor signal and a contaminant identification module uses the noise level to determine whether there is a contaminant in the liquid in the conduit.

A flowmeter ( 200 ) is provided having a flow inlet ( 210 ) and a flow outlet ( 210 ′). A first conduit ( 208 A) has an inlet leg ( 212 A) fluidly coupled to a central conduit portion ( 212 C), wherein the central conduit portion ( 212 C) is further fluidly coupled to an outlet leg ( 212 ′A). A second conduit ( 208 B) has an inlet leg ( 212 B) fluidly coupled to a central conduit portion ( 212 ′C), wherein the central conduit portion ( 212 ′C) is further fluidly coupled to an outlet leg ( 212 B). The flow inlet ( 210 ) is fluidly coupled to a first end of the first conduit ( 208 A) and a first end of the second conduit ( 208 B), and the flow outlet ( 210 ′) is fluidly coupled to a second end of the first conduit ( 208 A) and a second end of the second conduit ( 208 B). A manifold ( 206 ) is fluidly coupled to the inlet legs ( 212 A, 212 B) and the outlet legs ( 212 ′A, 212 B). A driver ( 214 ) is at least partially coupled to the manifold, wherein the driver ( 214 ) is operable to vibrate the first and second conduits ( 208 A, 208 B).

A vibratory meter ( 5 ) is provided, having a driver ( 104 ) and a vibratory member ( 103, 103 ′) vibratable by the driver ( 104 ). At least one pickoff sensor ( 105, 105 ′) is configured to detect vibrations of the vibratory member ( 103, 103 ′). Meter electronics ( 20 ) comprise an interface ( 301 ) configured to receive a vibrational response from the at least one pickoff sensor ( 105, 105 40 ), and a processing system ( 303 ) coupled to the interface ( 301 ). The processing system ( 303 ) is configured to measure a drive gain ( 306 ) of the driver ( 104 ), and measure a total density ( 325 ) of a multiphase process fluid in the vibratory meter ( 5 ), and determine whether the drive gain ( 306 ) is below a first threshold. A liquid/liquid phase concentration allocation is determined with the measured total density ( 325 ) if the drive gain ( 306 ) is below the first threshold, and a flow rate for each liquid phase is calculated.

A method for determining a mass flow measurement is provided. The method comprises calibrating a flowmeter sensor at a first temperature and flowing a fluid having a second temperature through the flowmeter sensor. A density of the fluid is input into meter electronics. A compensated mass flow value of the fluid is determined by meter electronics, wherein the Modulus of Elasticity of the flowmeter sensor is unknown.

Vibratory meters ( 5 ), and methods for their use measuring a fluid are provided. Each vibratory meter includes a multichannel flow tube ( 300 ) comprising two or more fluid channels ( 302 ), a pickoff ( 170 ), a driver ( 180 ), and meter electronics ( 20 ) configured to apply a drive signal to the driver at a drive frequency ω, and measure a deflection of the multichannel flow tube with the pickoff. In examples, at least one fluid channel has an effective diameter that is related to kinematic viscosity, inverse Stokes number, and drive frequency. In further examples, the driver may apply a drive signal to the driver having a drive frequency proportional to the kinematic viscosity, inverse Stokes number, and effective diameter.