Production of electromagnetic flowmeter manufacturers: calibre analysis of the impact of flow measur

　　Electromagnetic flowmeter is a commonly used flow measurement instrument, which measures the flow of liquid or gas through the principle of electromagnetic induction. In the measurement process of electromagnetic flowmeter, calibre is a very important parameter, which has an important impact on the accuracy and stability of flow measurement. In this paper, we will analyse the calibre of the electromagnetic flowmeter measurement principle, measurement accuracy and the use of the effect of the calibre of the electromagnetic flowmeter to explore the impact of the measurement.

　　First, the calibre of the electromagnetic flowmeter measurement principle of influence

　　Electromagnetic flowmeter measurement principle is the use of magnetic field induction method to measure the flow of conductive liquids. When the conductive liquid flows through the measuring tube, the liquid charge movement will produce magnetic field perturbation, this magnetic field perturbation will be sensed by the magnetic field sensor, thus generating a voltage signal, and then measure the flow of liquid. Due to the liquid flow speed and flow position is different, so in different aperture, the range of magnetic field disturbance and magnetic field sensor receiving range will also be different, thus affecting the electromagnetic flowmeter measurement accuracy and stability.

　　The smaller the calibre, the faster the flow of liquid, the smaller the range of magnetic field perturbation, so that the signal received by the magnetic field sensor will be subject to greater noise interference, thus affecting the measurement accuracy and stability of electromagnetic flowmeter. In addition, in the case of a small calibre, due to the narrow flow channel, it is easy to appear liquid flow is not smooth, thus affecting the electromagnetic flowmeter measurement effect.

　　The larger the calibre, the slower the flow rate of the liquid, the greater the range of magnetic field perturbation, so that the signal received by the magnetic field sensor will be more stable, thus improving the measurement accuracy and stability of electromagnetic flowmeter. In addition, in the case of a larger calibre, due to the wide flow channel, the liquid flow smoothly, thus improving the measurement effect of electromagnetic flowmeter.

　　Second, the calibre of the electromagnetic flowmeter measurement accuracy impact

　　Electromagnetic flowmeter measurement accuracy refers to the electromagnetic flowmeter measured flow value and the actual flow value of the error between the size. The size of the calibre will directly affect the measurement accuracy of the electromagnetic flowmeter, the larger the calibre, the electromagnetic flowmeter measurement accuracy is relatively higher, while the smaller the calibre, the electromagnetic flowmeter measurement accuracy is relatively lower.

　　This is because in the case of a larger calibre, the liquid flow rate is relatively slow, the flow rate of change is relatively smooth, so that the magnetic field sensor received by the signal is relatively stable, thus improving the measurement accuracy of electromagnetic flowmeter. In the case of a smaller calibre, the liquid flow rate is relatively fast, the flow rate changes are more violent, which makes the magnetic field sensor received signals are relatively unstable, thus reducing the measurement accuracy of electromagnetic flowmeter.

　　In addition, the size of the calibre will also affect the repeatability and stability of the electromagnetic flowmeter. In the case of a larger calibre, electromagnetic flowmeter repeatability and stability is relatively high, because the changes in liquid flow is relatively smooth; and in the case of a smaller calibre, electromagnetic flowmeter repeatability and stability is relatively low, because the changes in liquid flow is more intense.

　　Third, the calibre of the electromagnetic flowmeter on the use of the effect

　　The size of the calibre will also affect the use of electromagnetic flowmeter, specifically in the following areas:

　　1. Smaller calibre electromagnetic flowmeter can be used in smaller pipelines, while the larger calibre electromagnetic flowmeter needs to be used in larger pipelines, which will affect the scope of application of electromagnetic flowmeter and the use of results.

　　2. Smaller calibre electromagnetic flowmeter can measure the flow rate of faster liquids, but the accuracy and stability is relatively low, while the larger calibre electromagnetic flowmeter can measure the flow rate of slower liquids, accuracy and stability is relatively high.

　　3. Smaller calibre electromagnetic flowmeter is usually cheaper than the larger calibre electromagnetic flowmeter, but it should be noted that, if the flow measurement of precision and stability requirements are higher, then choose a larger calibre electromagnetic flowmeter may be more appropriate.

　　In summary, the calibre is an important parameter that affects the measurement accuracy and stability of the electromagnetic flowmeter, the calibre size will directly affect the electromagnetic flowmeter measurement effect and scope of application. In the choice of electromagnetic flowmeter, should be based on the specific circumstances of the choice of calibre size.