Flow meter plugin | Precautions for mass flow meters

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1. What is a flow meter? A flow meter is a set of connected components used to provide a unique signal of the flow rate (or a quantity of fluid) in a pipeline, and this signal is not affected by installation or environment. The following is a detailed introduction to flow meters: Measurement purpose and signal characteristics: The main purpose of installing a flow meter is to obtain the measured value of the flow rate, usually presented in the form of an electrical signal, which has a specific extended uncertainty and is a definite value. In an ideal situation, the influence of the inlet and outlet pipelines as well as the working environment on this signal can be ignored. The measurement uncertainty is expressed as $y pm U $, where $U $is the uncertainty, which may be a specific value, such as $0.5% $, and it is necessary to clarify whether the value corresponds to flow rate, full-scale (FSD), or some combination (such as $pma $(measured) $pmb $(FSD)). At the same time, the range (such as $1 sim 20 m ^ 3/h $) should be given, and the confidence level including factor $k=2 $and approximately $95% $should be explained. If necessary, you can also indicate the certification body (domestic or international) of the calibration device. Related characteristic range: The related characteristic range of the flowmeter includes the flow range of the fluid (outside the calibration value), the maximum working pressure, the temperature range of the fluid, and the ambient temperature. These parameters are crucial for selecting and using appropriate flow meters, as different application scenarios may have different requirements for these parameters. Response parameters: There are two useful parameters for the response of flow meters. The parameter $K $is the number of pulses per unit flow rate, and in turbine and vortex flow meters, $K $is the number of pulses per unit volume. In addition, the instrument coefficient is also an important parameter, but its definition may vary, sometimes being the reciprocal of $K $. Error limit and calibration: The error limit of the flowmeter provides the uncertainty of the instrument for actual flow under different flow rates. The uncertainty of some flow meters can only be given at the maximum flow rate. For example, if the uncertainty of a flow meter is $1% FSD $, the uncertainty at half the flow rate may be $2%, and the uncertainty at $20% flow rate may be $5%. Manufacturers usually only calibrate the flowmeter at specific points (such as $90% FSD $, or $50% and $90% FSD $), and then determine that the flowmeter characteristics meet the error limit. If the instrument is stable enough, detailed calibration can be performed, such as $5, $10, or even $20 measurement points. After obtaining detailed curves, computer fitting can be used to achieve higher accuracy, such as $pm 0.2%. Manufacturers sometimes use the term linearity to describe the linearity of flow meters, such as a range ratio of $10:1 and a linearity of $pm 1%. Common cases of error limits: The first case is when the linear region of the flowmeter is within a specific range ratio (such as $10:1), and the uncertainty of traceable calibration is a fixed value (such as $1%) at a confidence level of $95%. Such flowmeters can meet most industrial requirements. The second scenario is that some flow meters, due to their physical properties, have an uncertainty that can only be given at the maximum flow rate. For example, in the case where the uncertainty is

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