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(1) Physical properties of fluids The media commonly used in experiments are water, air and oil. In the field, there will be tens of thousands of fluids whose physical properties (such as density, viscosity, electrical conductor, thermal conductivity, speed of sound, composition...) are different from those commonly used in experiments. More or less affect the accuracy of the electromagnetic flowmeter. However, the physical properties of these fluids can be found in some engineering manuals and given corrections to mitigate their effects. This is also an important part of the intelligentization of electromagnetic flowmeters.
(2) Fluid properties The fluid passing through the Rosemount 8721 electromagnetic flowmeter on site may not be as clean as the fluid used in the laboratory. They may be precipitated and corrosive. After a period of use, there will be fouling, wear and corrosion on the pipe inspection parts. The deposit on the pipe wall will alter the wall thickness and roughness of the pipe. For the standard orifice plate, the β value will be changed to constitute ±3~10% of the error; the moving parts of the turbine, rotor and positive displacement flowmeter will be worn and corroded, and light errors will occur, but the operation will not be possible; The pollution of the electrode of the meter, the transducer of the ultrasonic flowmeter, and the thermal resistance of the thermal flowmeter may reduce the sensitivity and increase the error; the formation of the pressure-receiving orifice of the differential pressure flowmeter is blocked, and the like. Of course, this process is slow, but it must not be careless. Simply focusing on regular repairs and forming guidelines can mitigate (or eliminate) their effects.
(3) Characteristics of the activity In the laboratory, the Rosemount 8721 electromagnetic flowmeter should be in a more ambitious state of activity, it should be:
Newtonian fluid: In the process industry, most of the food industry is Newtonian fluid.
Constant current flow: an activity state in which the flow rate does not change with time, but a slow change is agreed. The pulsating flow in the industry (an active state in which the flow changes faster with time) is the unsteady flow. . In the industrial field, pulsating flow will occur due to oscillation of pumps, compressors, blowers, certain regulators, and valves, which will bring large errors to the electromagnetic flowmeter.
The above is the factor affecting the accuracy of the Rosemount 8721 electromagnetic flowmeter today. I have shared all three aspects. I hope that it will be helpful for everyone to use this equipment in the future.
Factors affecting the accuracy of the Rosemount 8721 electromagnetic flowmeter, which are the primary factors affecting the accuracy of the Rosemount 8721 electromagnetic flowmeter , excluding the principle of the electromagnetic flowmeter and the structure itself, the external factors affecting its accuracy are the primary conclusions It is the three aspects of the physical properties of fluids, the properties of fluids, and the characteristics of activities: