Emerson mass flowmeter working principle

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Working Principle As a practical application of the Coriolis effect, the working principle of the Coriolis mass flowmeter is to vibrate the flow tube through which the medium flows. Although the vibration is not a complete circle, it still forms a rotating coordinate system, thereby inducing the Coriolis effect. The sensor detects and analyzes changes in flow tube frequency, phase difference, and amplitude. The specific detection method will vary depending on the flow meter design. These observed changes represent the mass flow rate and density of the fluid. Mass flow measurement The measuring tube oscillates under the action of force, thus generating a sine wave. When the flow rate is zero, the two pipes vibrate in phase. When there is flow, the Coriolis force causes the pipe to bend, causing a phase shift. Measures the time difference between sinusoidal waves, which is proportional to the mass flow rate. A. Inlet detection displacement B. No flow C. Exit detection displacement D. Time E. Inlet detection displacement F. With flow G. Exit detection displacement H. Time difference I. Time density measurement The measuring tube vibrates at its natural frequency. Changes in the quality of the medium in the pipeline will cause corresponding changes in the natural frequency of the pipeline. Density is calculated from the frequency variation of the pipe. Temperature measurement Temperature is a measured variable that can be used as an output variable. In addition, temperature can be used to compensate within the sensor the effect of temperature changes on Young's modulus of elasticity. Emerson mass flowmeter instrument characteristics: The measurement accuracy of media mass flow is independent of operating temperature, pressure or composition. However, the sensor's pressure drop depends on the operating temperature, pressure, and composition of the medium. Specifications and features vary by model, and some models may have fewer available options. All meters with a CMF designation (CMF, CMFHC, CMFS) are meters under the ELITE meter category and should be considered to be of the same quality and specifications as other ELITE category meters (unless otherwise noted). The letters at the end of the base model code (e.g. CMF100M) indicate the material and/or application designation of the wetted parts: M = 316L Stainless Steel, L = 304L Stainless Steel, H = Nickel Alloy C22, P = High Pressure, A = High Temperature 316L Stainless Steel, B = High Temperature Nickel Alloy C22, Y = Super Duplex (UNS S32750).