The physical principles of electromagnetic flow meter scale interference noise, characteristics and countermeasures

Abstract: the physical mechanism of the electromagnetic flowmeter scale interference noise, characteristics and countermeasures of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. For electromagnetic flowmeter anti-interference techniques were discussed, must first the physical mechanism of electromagnetic flowmeter interference noise and feature analysis and research, which adopted according to the characteristics of all kinds of jamming noise corresponding anti-interference measures, in order to improve the electromagnetic flow. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the physical mechanism of the electromagnetic flowmeter scale interference noise, feature and its countermeasure article details. For electromagnetic flowmeter anti-interference techniques were discussed, must first the physical mechanism of electromagnetic flowmeter interference noise and feature analysis and research, which adopted according to the characteristics of all kinds of jamming noise corresponding anti-interference measures, in order to improve the anti-interference ability of electromagnetic flowmeter. 1 power frequency interference noise power frequency interference noise is by electromagnetic flow sensor exciting winding and the fluid electromagnetic coupling, electrode, amplifier input circuit, and the scene of the electromagnetic flowmeter work power frequency common-mode interference, the introduction of third power supply series mode power frequency interference, etc. , and its physical mechanism are all electromagnetic induction principle. Electromagnetic flow sensor exciting winding and the fluid in the first place, electrode, amplifier input circuits of power frequency interference produced by the electromagnetic coupling effect on electromagnetic flowmeter work zui, and its performance under different excitation technology different morphology, properties, and anti-interference measures are also different, as shown in figure 1 under all kinds of excitation technology characteristics of the power frequency interference noise. Under power frequency sine wave excitation magnetic field, the electromagnetic coupling form of orthogonal interference noise power frequency interference, also known as the potential transformer, its characteristic is interference noise amplitude and frequency is proportional to the power frequency sine wave excitation, signal phase lag flow potential, 900, a traffic signal and amplitude potential big orders of magnitude. In low-frequency rectangular wave excitation, three values low-frequency rectangular wave excitation and the double frequency rectangular wave excitation conditions, the electromagnetic coupling form of differential interference noise power frequency interference, the waveform of pulse waveform, the amplitude and the magnetic flux rate is proportional to the, attenuation, and according to the index law in general than its amplitude sine wave excitation, under the condition of orthogonal interference and the differential interference in excitation flux change when alone, and in constant flux, the next flux change before won't produce differential interference, has an inherent. For orthogonal interference noise under power frequency sine wave excitation, using complex orthogonal suppression system reduce the effects of orthogonal interference noise, but as a result of the orthogonal interference noise several orders of magnitude larger than the potential traffic signal orthogonal any incomplete inhibition of electronic circuit will cause part of orthogonal interference into in-phase interference, the power frequency sine wave excitation electromagnetic flowmeter zero drift, the flow measurement precision is difficult to improve. USES low-frequency rectangular wave excitation, three value low-frequency rectangular wave excitation and dual-band rectangular wave excitation, orthogonal interference noise evolved into differential interference. Due to the differential interference has a period of time, using the synchronous sampling technology in constant magnetic field on a regular basis, namely the differential interference attenuation is zero, the wide pulse synchronous sampling ( Power frequency cycle is an even number of times) , in order to avoid traffic signal series electric potential effect of the power frequency interference. The second use control field current ( Excitation flux) Variation method of decreasing amplitude of differential interference, but reduce the traffic signal sampling interval; Also can use programmable gain technology makes the differential interference time gain for Odb, and constant flux period is 100 db gain, to minimize the influence of the amplitude of differential interference. For power frequency common-mode interference and series mode power frequency interference is a common interference, is mainly due to the electromagnetic shielding defects, distributed capacitance coupling, electromagnetic flowmeter created bad earth, the input protection technology, high input impedance, high common mode rejection ratio bootstrap preamplifier and repeat grounding technology, wide pulse power frequency synchronous sampling technology and improve the ability of power frequency interference. 2 fluid characteristics of electrochemical interference noise electrochemical polarization potential interference is due to induced electromotive force in the polarity between different electrode polarization of electrolyte on the electrode surface. Although the positive and negative alternating excitation magnetic field can significantly reduce the order of magnitude of polarization potential, but it can not fundamentally eliminate polarization potential interference.

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