Method of measuring pulsating flow with electromagnetic flow meter

Abstract: The information on the method of electromagnetic flowmeter measuring pulsating flow is provided by the excellent flowmeter and flowmeter manufacturers and quotation manufacturers. Pulsating flow is common in industrial pipe flow and may be produced by rotary or reciprocating prime movers, compressors, blowers, pumps, and rotating machinery with wings can also produce small pulsations at the blade pass frequency. Some positive displacement flow meters can also produce pulsation. caused by vibration. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the article details of the method of electromagnetic flowmeter measuring pulsating flow. Pulsating flow is common in industrial pipe flow and may be produced by rotary or reciprocating prime movers, compressors, blowers, pumps, and rotating machinery with wings can also produce small pulsations at the blade pass frequency. Some positive displacement flow meters can also produce pulsation. Vibration-induced resonance, oscillations in piping operation and control systems, and flow separation caused by valve 'vibration', pipe fittings, valves, or rotating machinery are also possible sources of flow pulsation. There are three ways to measure the flow rate of pulsating flow: one is to use a flowmeter with fast response; the other is to use an appropriate method to attenuate the pulsation to a sufficiently small amplitude, and then use an ordinary flowmeter to measure; The measured flow values ​​are subject to error correction. In some systems, the latter two methods need to be combined to achieve measurement. This is because the pulsation amplitude is large, which exceeds the applicable range of the estimation formula. If only the damping method is used, the damped pulsation amplitude cannot enter the stable flow range. . When the electromagnetic flowmeter selects a higher excitation frequency, it can respond quickly to the pulsating flow, so it can measure the pulsating flow. It is often used to measure the outlet flow of reciprocating pumps, diaphragm pumps, etc. Electromagnetic flowmeters used for pulsating flow measurement usually need to be specially designed in the following three aspects, and should be properly debugged when put into operation. 1. The excitation frequency is adjustable, so as to obtain the excitation frequency suitable for the pulsation frequency. Too high and too low are bad. 2. The analog signal processing part of the electromagnetic flowmeter should prevent the pulsation peak from entering a saturated state. The pulsating peak value of pulsating flow is sometimes surprisingly high. If the peak value occurs, the flow signal input channel of the electromagnetic flowmeter enters a saturated state, just as the peak value is eliminated, which will inevitably lead to a low value of the meter. 3. In order to read out the average value, the display part should be smoothed. Because the measurement part of the electromagnetic flowmeter can quickly respond to the change of the pulsating flow flow and truly reflect the actual flow, but if the display part also displays the actual flow value faithfully, it will inevitably cause the display value to jump up and down greatly, which is difficult to read, so the display should be taken as average over time. The realization method is usually to insert an inertia link in series. After selecting the appropriate time constant, the instrument can display stably. However, if the time constant is selected too large, the response of the display part will be slow when the average flow rate changes, which will bring an illusion to the observer. The above is an introduction to the method of electromagnetic flowmeter measuring pulsating flow. If you want to know more about flowmeters, or you can purchase and select flowmeters, you can contact the flowmeter manufacturer, and we will serve you wholeheartedly. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Method of measuring pulsating flow with electromagnetic flowmeter'

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