What conditions are electromagnetic flow meters not suitable for?

Case introduction

　　Electromagnetic flowmeter using Faraday electromagnetic induction principle of measurement measurement, measurement range is more extensive, almost suitable for most of the liquid conductive media, installation methods are also a variety of ways, in general, the internal no moving parts.

　　However, it should be noted that such a wide range of electromagnetic flowmeter, in some special conditions can not be used normally.

　　First of all, the measurement of the pipeline medium is not full of pipe, electromagnetic flowmeter can not work properly, and will issue a warning sound alarm, the flowmeter will not be normal measurement.

　　Caused by this situation is generally divided into two reasons, one is the pipeline medium flow rate is low, resulting in not full of pipe, so that the flowmeter measurement error will increase; the other reason is that the measurement medium is too little, failed to pass the electrode, resulting in the flowmeter in the sensor can not sense the liquid flow rate can not be carried out normal work.

　　Secondly, the measurement medium contains a large amount of air and gas, will also cause the electromagnetic flowmeter can not work properly, interfering with its accuracy, but in general, as long as the standardized installation, this situation is relatively rare.

　　Third, the electromagnetic flowmeter is not suitable for measurement of shorter duration of operation, many people may not be clear, this is due to the electromagnetic flowmeter can not be normal repeated start and stop, this will not only cause damage to the product, but also important is the electromagnetic flowmeter to start to the correct readings between the existence of a time lag. Measurement time is short then may be because the value has not yet returned to normal, has stopped the whole process, resulting in large data error.

　　Furthermore, the electromagnetic flowmeter itself cannot measure mass flow. Electromagnetic flowmeter is a liquid flowmeter, measuring the volume flow, if you want to measure the mass flow, you must cooperate with high-precision densitometer device to convert, choose the right flowmeter to solve.

　　The above summary are the conclusions drawn by Famit in the field survey, in the future the use of flow meters and selection process should pay more attention to avoid causing unnecessary measurement errors.