The selection of electromagnetic flow timing can not be ignored
Electromagnetic flowmeter selection is generally more concerned with the measurement medium, temperature, pressure, connection form, protection level and whether explosion-proof.
Electromagnetic flowmeter selection is generally more concerned with the measurement medium, temperature, pressure, connection form, protection level and whether explosion-proof. Although there is also concern in the range, but because the electromagnetic flowmeter is a linear instrument, the range can be adjusted online according to user requirements, without re-calibration, so many people ignore the importance of the range.
The range, that is, the measurement range, is a very key factor in whether the electromagnetic flowmeter can be better used. Although the electromagnetic flowmeter is linear, the range is adjustable, and there is no starting flow rate. However, due to the instability of the electromagnetic flowmeter at low flow rates, the accuracy will greatly deteriorate as the flow rate is reduced to a certain value (according to the flow curve, generally around 0.5m/s, which is the inflection point). Despite the metrological display and output, the accuracy of calibration can no longer be guaranteed. Therefore, the lower limit value of the electromagnetic flowmeter is a condition that cannot be ignored when selecting. The flow range of some production enterprises is written from 0, in fact, this is a misunderstanding, because according to the flow curve, 0 will be displayed and output, but the accuracy will be much greater than 0.3% or 0.5%.
Therefore, when selecting the electromagnetic flowmeter, it is necessary to ensure that the use range meets the lower limit requirements of the manufacturer, the common flow rate is 60%-80% of the upper limit of the range given by the manufacturer, and the low use flow rate does not exceed the lower limit of the manufacturer, which can ensure the accuracy and ensure the extension of the upper limit of the flow rate.
Since the electromagnetic flowmeter is linear, the increase of the upper limit flow will not affect the accuracy, so for those users who reserve flow, as long as the lower limit flow can be calculated.
