What are the three factors that affect the accuracy of 8721 electromagnetic flowmeter
influence8721 electromagnetic flowmeterThe primary element of accuracy, excluding the principle and construction of electromagnetic flow meters themselves, is primarily attributed to the physical properties of the fluid, the characteristics of the fluid, and the properties of the activity
(1) Physical properties of fluids
The commonly used media in experiments are water, air, and oil. In on-site use, there will be tens of thousands of various fluids, whose physical properties (such as density, viscosity, electrical conductivity, thermal conductivity, sound velocity, composition, etc.) are different from those commonly used in experiments, which will more or less affect the accuracy of electromagnetic flow meters. But the physical properties of these fluids can be found in some engineering manuals and corrected to mitigate their impact. This is also an important aspect of the intelligence of electromagnetic flow meters.
(2) Characteristics of fluids
The fluid passing through the 8721 electromagnetic flowmeter on site may not be as clean as the fluid used in the laboratory. They may have sediment and be corrosive. After a period of use, scaling, wear, and corrosion may still occur on the inspection parts at the pipe edge. Sediments on the pipe wall will alter the wall thickness and roughness of the pipeline. For standardized orifice plates, the β value may be altered, resulting in an error of ± 3-10%; Wear and corrosion may occur on the moving parts of the turbine, rotor, and positive displacement flowmeter, ranging from minor errors to severe malfunctions; The contamination of the electrodes of electromagnetic flow meters, transducers of ultrasonic flow meters, and thermal resistors of thermal flow meters will reduce their sensitivity and increase errors; The blockage of the pressure tapping hole of the differential pressure flowmeter, etc. Of course, this process is slow, but it must not be careless. And simply focusing on regular repairs and forming guidelines can also alleviate (or eliminate) its impact.
(3) Characteristics of the activity
In the laboratory,8721 electromagnetic flowmeterShould be in a more ambitious state of activity, it should be:
Newtonian fluid: In the process industry, except for the food industry, Newtonian fluid is commonly used.
Steady flow: an active state in which the flow rate in a measuring pipeline does not change with time, but slow changes are allowed. In industry, pulsating flow (an active state in which the flow rate changes rapidly with time) is called unsteady flow. In industrial sites, pulsating flow will occur due to the oscillation of pumps, compressors, blowers, certain regulators, and valves, which will cause significant errors in electromagnetic flow meters.
The above is today's discussion on the factors that affect the accuracy of the 8721 electromagnetic flowmeter. We have shared all three aspects, hoping to be helpful for everyone to use this equipment in the future.