Coriolis flow-measuring device and method for calibrating and/or operating a coriolis flow-measuring device

A Coriolis flow-measuring device for determining a mass flow, a medium density and/or a medium viscosity of a fluid measuring medium in a process line, the flow-measuring device comprising:

• a measurement system including a measurement line adapted to convey the measuring medium and at least one measuring tube, which is sterile and/or connected in a detachable manner to the measurement line and/or designed as a disposable product;
• a calibration system including a calibration line separate from the measurement line and adapted to convey a calibration medium wherein the calibration system includes at least one calibration tube, which is non-sterile and/or is arranged parallel to the at least one measuring tube;
• an exciter system configured to excite mechanical oscillations in both the measurement system and the calibration system;
• a sensor system configured to detect mechanical oscillations of both the measurement system and the calibration system,
• wherein the exciter system and the sensor system are each connected in a detachable manner to both the measurement system and the calibration system;
• measuring and calibration electronics electrically connected to both the exciter system and the sensor system and configured to:
• cause both the at least one measuring tube and the at least one calibration tube to oscillate via the exciter system,
• determine oscillations of the at least one measuring tube and the at least one calibration tube via the sensor system,
• determine at least one calibration variable of an overall system formed by the measurement system and the calibration system based on oscillations determined via the sensor system both of the measurement system conveying the measuring medium and of the calibration system conveying the calibration medium,
• determine whether the calibration medium is conveyed in the calibration system with a predetermined reference mass flow and/or a predetermined reference density and/or a predetermined reference viscosity, and
• based on the determined oscillations, both of the measurement system through which the measuring medium flows and of the calibration system conveying the calibration medium, determine the mass flow, the medium density and/or the medium viscosity of the measuring medium as a function of the at least one calibration variable and/or a variable derived therefrom, wherein the at least one calibration variable includes whether the measuring medium flows in the measurement system.

A method for calibrating and/or operating a Coriolis flow-measuring device, which comprises measuring and calibration electronics, a sensor system, an exciter system, a measurement system with a measurement line adapted for flowing a measuring medium therethrough and a calibration system with a calibration line, separate from the measurement line, adapted for flowing a calibration medium therethrough, the method comprising:

• conducting the calibration medium through the calibration line,
• performing a calibration when the calibration medium flows through the calibration line at a predetermined mass flow, wherein the calibration comprises:
• using the exciter system, exciting the calibration line and the measurement line to perform oscillations;
• using the sensor system, measuring the oscillations of a calibration tube of the calibration line and a measuring tube of the measurement line;
• using the measuring and calibration electronics, determining at least one calibration variable as a function of the measured oscillations for an overall system provided by the measurement system and the calibration system;
• flowing the measuring medium through the measurement line;
• and
• determining a mass flow, a medium density, and/or a medium viscosity of the measuring medium as a function of the determined at least one calibration variable.