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When using flow meters for measurement, we often need to refer to many parameters. However, those who are new to flow meters may not be familiar with them yet. This article will explain some of the commonly used flow parameters. 1. Flow range: The flow range of a flow meter refers to the maximum to minimum flow rate within which the measurement error remains within acceptable limits under normal operating conditions. The algebraic difference between the maximum and minimum flow rates is known as the flow range, while the ratio of the maximum flow rate to the minimum flow rate is commonly referred to as the flow meter’s range ratio. 2. Rated flow rate: The flow value of a flow meter at its specified or optimal performance is referred to as the rated flow rate of that flow meter. 3. Flow meter characteristic curve: The flow meter characteristic curve is a curve that reflects the changes in the meter’s performance as the flow rate changes. There are two common ways of representing characteristic curves: one shows the relationship between a certain characteristic of the flow meter (usually the flow coefficient or instrument factor, or sometimes some other flow-related output value) and the flow rate q or the Reynolds number Re ； Another type represents the relationship between the measurement error of the flow meter and the flow rate q or the Reynolds number Re; such a characteristic curve is generally referred to as the error characteristic curve of the flow meter. The characteristic curve of a flow meter can be obtained through theoretical analysis of the flow meter, but a more accurate and reliable method is to calibrate the flow meter, that is, by conducting a series of experiments across the entire flow range of the flow meter. 4. Flow coefficient: The flow coefficient of a flow meter represents the ratio of the actual flow rate through the meter to the theoretical flow rate. Generally speaking, its influencing factors are quite complex, making it difficult to determine through theoretical analysis; they can only be ascertained through experiments. 5. Instrument coefficient: The instrument coefficient of a flow meter indicates the number of signal pulses corresponding to a unit volume flow rate passing through the flow meter. It is an important parameter for flow meters of the pulse signal output type, and it also serves as the basis for connecting the measuring element of such flow meters with the display instrument. 6. Repeatability: The repeatability of a flow meter refers to its ability to yield identical results when measuring the same flow rate multiple times in succession. It is important to note not to confuse repeatability with accuracy; accuracy refers to the ability of a flow meter’s measurement values to be close to the true value. If a flow meter has poor repeatability, then its accuracy is irrelevant, but even a flow meter with good repeatability can still produce inaccurate measurement results. 7. Linearity: The linearity of a flow meter is a measure of the degree to which the characteristic curve deviates from the optimal fitting line across the entire flow range. For more information, please visit the company’s official website at http://www.yb1518.com/. Please keep this link when reproducing the content! http://www.yb1518.com/UploadFiles/2012717174126829.jpg