Common anti-interference measures of electromagnetic flow meter scale

Abstract: the electromagnetic flow meter scale commonly used anti-jamming measures information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. Electromagnetic flowmeter measurement principle is based on Faraday's law of electromagnetic induction, it produces the original signal is very weak, lack of mv. If there is a strong electromagnetic field radiation near the flow meter, such as motor, transformer, inverter and other easy to cause electromagnetic interference. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the commonly used anti-jamming measures the electromagnetic flow meter scale article details. Electromagnetic flowmeter measurement principle is based on Faraday's law of electromagnetic induction, it produces the original signal is very weak, lack of mv. If there is a strong electromagnetic field radiation near the flow meter, such as motor, transformer, inverter some equipment, easy to cause electromagnetic interference will affect the accuracy of the measurement, and even make meter cannot work normally. So how to signal interference is particularly important. The following are some of the practical experience accumulated over the years my company, for your reference. 1, elimination of differential interference and power frequency interference, often exist differential interference in the signal and power frequency interference signals, low pass filtering in the signal processing circuit is often difficult to completely filter out the power frequency interference. The company USES the synchronous sampling and power frequency compensation technology, to suppress potential traffic signal in the mixed with power frequency interference and power frequency power frequency wave power frequency interference, and in addition to the differential interference effectively. Synchronous sampling technology, sampling start time lag excitation signal 1/4 cycle, it adopts the pulse width of an even number of times the power frequency cycle, eliminate differential interference average potential zhonggong frequency interference at the same time make the traffic signal is equal to zero, in order to eliminate the influence of power frequency interference; Compensation is to ensure that the frequency of the power frequency power supply fluctuation frequency of the dynamic wave, the excitation power supply and the sampling pulse synchronous adjustment, realize synchronous sampling technology and synchronous excitation technology, synchronous A/D conversion, reduce the influence of differential interference and power frequency interference. 2, zero drift removing: so-called zero drift, is when the input signal of the sensor is zero, the output of the amplifier is not zero. Zero drift signal will pass between the levels of amplification circuit, after multiple amplification, signal on the output side become larger, as a result of the sensor output signal is weak, zero drift can drown the useful signal and make circuit cannot work normally. So in order to suppress zero drift and adopts three op-amp input differential circuit, realize the internal resistance of weak signal acquisition, to suppress the introduction of the common mode signal. Level by blocking capacitor after amplifying circuit, filter the baseline drift, prevent dc signal is too large, is beyond the scope of A/D transformation input. 3, remove the interference of other measures: for by the electromagnetic flowmeter sensor & other; The transformer effect & throughout; Produced by the orthogonal interference, using & other; Transmitter zero method & throughout; To get rid of. Software design, the use of digital filtering technology and power-fail protection technology, instruction redundancy, software measures, can effectively improve the reliability of the microprocessor digital input. Electromagnetic flowmeter maintenance point: electromagnetic flowmeter in use after a period of time, will find measurement data is not accurate. In fact this is not the quality problem of the electromagnetic flowmeter itself exists. But because users don't have carried out in accordance with the manual method to the flowmeter in the maintenance and maintenance. One, zero check and adjustment: intelligent electromagnetic flowmeter in operation before, after electrify electromagnetic flow sensor must be filled with liquid under stationary state zero adjustment. After put into operation or to use condition periodically stop flow for zero check; Especially on precipitation, easy pollution electrode, the cleaning liquid containing solid phase, at the beginning of the run should be checked, in order to obtain experience to determine the normal inspection cycle. Ac excitation mode of electromagnetic flowmeter with rectangular wave excitation, are more likely to produce zero drift, so more attention should be paid to check and adjust. Second, regularly check the sensor's performance first roughly measure resistance between electrodes. Disconnect between the converter and signal connection of sensor and sensor inside fluid-filled, to the two electrodes and grounding resistance value is measured with a multimeter, e. range is in the factory, and measured by two values the same. Record the measured resistance value for the first time, after this value to judge the sensor failure reason ( If sediment is conducting or insulating) Is useful. Secondly, sensor emptying liquid, wipe the lining, after being completely dry megohm meter was used to measure the resistance between the two electrodes and earthing terminal. Above is my company of some of the commonly used method, the hope can help to you, if you have any question no problem, can contact my company, my company will be professional and technical personnel for your answer. Above is all there is in this article, you are welcome to inquire me manufacturer flowmeter selection, quotation, etc.

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