Flowmeter instrument coefficient dynamic correction method for improving range ratio
A technology of instrument coefficient and dynamic correction, applied in the field of flowmeters, can solve the problems of high turndown ratio and high-precision performance of flowmeters being difficult to achieve at the same time, and achieve the effect of improving manufacturing costs, making simulation effects better, and reducing computational load.
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Embodiment 1
[0052] In the existing various types of flowmeters, the inherent characteristics of the sensors and other sensitive elements used determine the range of the flowmeter. figure 1 Displays the measurement error versus flow rate for a typical element. Combining with the curve in the figure, it can be found that the error curve of the sensor is nonlinear in a large range. However, in the whole range, there are multiple linear intervals, and in each linear interval, the change of the error curve is monotonic.
[0053] Based on the above characteristics, in the prior art, in order to make the error of the flowmeter meet the corresponding accuracy level requirements, the measurement range of the flowmeter is usually set to a certain linear interval, and linear correction is performed within this interval. in, figure 1 The entire range of the curve can be understood as the theoretical range of the flowmeter, while the linear range actually used is the actual range of the flowmeter. ...
Embodiment 2
[0113] On the basis of Embodiment 1, this embodiment also provides an error compensation method for a flowmeter, which is used to generate a compensated corrected flow rate according to the metered flow rate of the flowmeter within the target range of the flowmeter. like Image 6 As shown, the error compensation method includes the following steps:
[0114] S001: adopt the dynamic correction method of the meter coefficient as in Embodiment 1, establish a mapping relationship between the metered flow rate q and the dynamic compensation coefficient k(q);
[0115] S002: Obtain the metered flow rate q measured by the test flowmeter at the current metering node, and then determine the dynamic compensation coefficient k(q) corresponding to the current metered flow rate q.
[0116]
[0117] In the above formula, Q[i] represents the previous flow point closest to the metered flow rate q, Q[i+1] represents the next flow point closest to the metered flow rate q, and X[i] represents ...
Embodiment 3
[0122] On the basis of Embodiment 2, this embodiment further provides an error compensation system for a flowmeter. The system uses the aforementioned error compensation method to compensate the measurement results of the flowmeter.
[0123] The compensation system can be applied to any flowmeter, and various parameters of the flowmeter can be obtained according to the actual test of the flowmeter. Then, the system is installed on the flowmeter, and is used to perform error compensation on the measured results obtained by the flowmeter each time in the actual application process, thereby generating accurate real flow statistics.
[0124] like Figure 7 As shown, the error compensation system includes: a meter flow acquisition module, a storage module, a meter coefficient update module, and an actual flow generation module.
[0125] The meter-measured flow acquisition module is used to acquire the value of the meter-measured flow rate q of the current measurement node measure...
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