Vibratory flow meter and method for determining viscosity in a flow material

摘要

A vibratory flow meter (5) for determining a viscosity of a flow material is provided according to the invention. The vibratory flow meter (5) includes a meter assembly (200) configured to generate a density (p) of a flow material, generate a first mass flow rate (m1) for a first flowtube (210a), and a second mass flow rate (m2) for a second flowtube (210b). The vibratory flow meter (5) further includes a restrictive orifice (252) located in the first flowtube (210a). The restrictive orifice (252) ensures that a first flow rate of the flow material in the first flowtube (210a) is less than a second flow rate of the flow material in the second flowtube (210b).

主权项

1. A vibratory flow meter (5) for determining a viscosity of a flow material, being characterized by:
a meter assembly (200) configured to generate a first vibrational response in a first flowtube (210a) and generate a second vibrational response in a second flowtube (210b); a common driver (104) configured to substantially simultaneously vibrate the first flowtube (210a) and the second flowtube (210b) to generate the first vibrational response and the second vibrational response; a changeable restrictive orifice (252) located in the first flowtube (210a), wherein the restrictive orifice (252) ensures that a first flow rate of the flow material in the first flowtube (210a) is less than a second flow rate of the flow material in the second flowtube (210b); and meter electronics (20) coupled to the meter assembly (200) and configured to determine the viscosity of the flow material from the first vibrational response and the second vibrational response, the meter assembly (200) including three pickoff sensors (218) configured to generate a first vibrational response from the first flowtube (210a) and a second vibrational response from the second flowtube (210b), wherein one of the three pickoff sensors (218) is shared between the first flowtube (210a) and the second flowtube (210b); and wherein the three pickoff sensors (218) are configured to generate a first independent vibrational response using the shared pickoff sensor and a first independent pickoff sensor of the three pickoff sensors, and to generate a second independent vibrational response using the shared pickoff sensor and a second independent pickoff sensor of the three pickoff sensors.