Can intelligent electromagnetic flowmeters measure mixtures?
Intelligent electromagnetic flowmeter measurement accuracy is high, stable performance, is a very common product in the flow meter, widely used in petroleum, chemical, food and other industries, especially water resources system, almost everywhere can see the figure of intelligent electromagnetic flowmeter, but the measured medium in these occasions is a single liquid, then with intelligent electromagnetic flowmeter can measure the mixture, Is a lot of owners are very want to know, I hope that today through this article to answer everyone’s doubts.
1. Liquid containing bubbles
The liquid mixed with tiny bubbles can still be measured normally, but the mixed volume flow rate containing the volume of bubbles is measured. If the gas content increases to form a blocky flow, the electrode may be covered by the gas so that the circuit is disconnected instantaneously, and the output wobble or even cannot work normally.
2, solid-liquid two-phase flow of liquid
The volume flow of the two phases can also be measured for the solid-liquid two-phase fluid containing non-ferromagnetic particles or fibers. Fluids with high solid content, such as drilling mud, drilling cement mud, pulp, etc. Because the solid flows together in the carrier liquid, there is a slip between the two, the speed is different, single-phase liquid inspection instrument used for solid-liquid two-phase flow will produce additional errors.
There are large particles in the slurry across the electrode surface, in the low frequency rectangular excitation electromagnetic flowmeter will produce a peak slurry noise, so that the flow signal is unstable, it is necessary to choose a higher frequency instrument or a strong ability to suppress the slurry noise instrument.
3. Liquids containing ferromagnetic substances
The fluid containing ferromagnetic substances on the usual electromagnetic flowmeter, because the permeability of the measurement tube is changed by the different content of the ferromagnet, will produce measurement error, but in the magnetic circuit with a magnetic flux detection coil compensation electromagnetic flowmeter EMF, can reduce the influence of mixed with the ferromagnet. The test report shows that the water contains liquid solid weight ratio of about 4:1, granularity ≤0.15mm iron fine ore pulp, 80mm diameter instrument for water and slurry comparison flow test, the usual instrument indicates the value change of 7%-10%, equipped with magnetic flux detection coil instrument, indicating the value error within ±2%Fs.
4. Pulp
The pulp used to measure the ore particles should pay attention to the wear degree of the sensor lining, and the increase of the inner diameter of the measuring tube will cause additional errors. In this case, the ceramic lining or polyurethane rubber lining with better wear resistance should be used, and it is recommended that the sensor be installed on the vertical pipe to make the pipe wear uniform and eliminate the shortcomings of the local wear of the lower part of the horizontal installation.
In summary, the intelligent electromagnetic flowmeter can be used to measure the mixture, as long as the relevant adverse factors are avoided, the same can obtain good measurement results.
