Correctly understand the relationship between the accuracy and repeatability of electromagnetic flowmeters

While some people believe that good repeatability is a measure of precision, this is a misunderstanding. Repeatability is by no means a guarantee of accuracy. Therefore, when considering measuring equipment, if you only see the repeatability statement and the accuracy statement, many users do not know that the accuracy and repeatability of the electromagnetic flowmeter are equivalent. Let us reiterate here that this perception is wrong. , Accuracy and repeatability are two completely different things, so we must correctly distinguish the relationship between the accuracy and repeatability of electromagnetic flowmeters. When explaining the relationship between the two, it is necessary to understand the accuracy and repeatability. Before the electromagnetic flowmeter leaves the factory, it needs to be calibrated, compared with the standard table, and finally synthesized by the computer. What is the accuracy? How much, not what we imagined, I want an accuracy of 0.2%, that is 0.2% as shown in Figure 1, Figure 1 Repeatability is the ability of a system or device to reproduce measurements under constant conditions. Measurements made by an electromagnetic flowmeter with poor repeatability will be fully performed as shown in Figure 2. Figure 2 An electromagnetic flowmeter with good repeatability may measure 97, 99 and 101 units per minute. Measurements are more repeatable because there is less variation between each measurement. Over time, the operator may find that setting a flow rate of 97 units per minute actually results in the desired output of 100 units per minute. Therefore, in some cases and depending on the application, repeatability is more critical than accuracy, as any repeatable errors can be compensated. As long as the output of the flowmeter is messy, it will not be close enough to the characteristic curve. In other words, once a flowmeter's measurements are determined to be repeatable, only then can an electromagnetic flowmeter be considered accurate. There are several applications that will be able to work with only repeatable magnetic flow meters, if that is necessary. For example, if the tank level rises, its level controller will increase its effluent flow in order to maintain the level setting. In this case, it doesn't seem necessary to measure the flow perfectly, but as long as the electromagnetic flowmeter is repeatable, an equal flow setting change will result in an equal flow change. And, since repeatable magnetic flowmeters are generally less expensive than state-of-the-art magnetic flowmeters, this will be an opportunity to reduce costs. Often overlooked, however, is the opportunity, or even the necessity, to perform calculations to ensure the economics of a process or the effectiveness of process improvements. For example, if the above-mentioned effluent flow meter is the overhead of a distillation column, its measurement can be used to calculate the reflux flow rate of the column. The original system design may not have taken this into account, but operational experience can determine that this control strategy will provide better control over the columns. Many such applications exist, and many of these opportunities are only discovered after the plant is operational. Sometimes a repeatable Magmeter should be replaced with a good Magmeter to get operational data and accommodate improvements. This is advantageous for electromagnetic flow meters because they repeatedly and reliably provide measurements that closely reflect the true flow rate. Repeatable meters may not provide good measurements, but they still have their place in many applications. Which one is the most suitable will depend in part on the application and your budget. The above is a correct understanding of the relationship between the accuracy and repeatability of electromagnetic flowmeters, so we should look at their relationship from a vertical and horizontal perspective.
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