Anti-interference tips for electromagnetic flow meters

Abstract: The information on the anti-interference tips of electromagnetic flowmeters is provided by excellent flowmeter and flowmeter manufacturers. When the sensor provides the flow signal to the converter, the potential difference between the electrodes is a voltage signal. In actual measurement, due to electromagnetic induction, electrostatic induction and electrochemical potential, the voltage obtained on the electrode is not only proportional to the flow rate. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the article on the anti-interference tips of electromagnetic flowmeters. When the sensor provides the flow signal to the converter, the potential difference between the electrodes is a voltage signal. In actual measurement, due to electromagnetic induction, electrostatic induction and electrochemical potential, the voltage obtained on the electrode is not only the electromotive force proportional to the flow rate, but also contains various interference components. 1. Elimination of differential interference and power frequency interference There are often differential interference and power frequency interference signals in the signal, and it is often difficult to completely filter out the power frequency interference by low-pass filtering in the signal processing circuit. The company adopts synchronous sampling and power frequency compensation technology to suppress the power frequency interference caused by the power frequency interference in the flow signal potential and the power frequency power supply frequency fluctuation, and effectively remove the differential interference. Synchronous sampling technology, the sampling start time lags the excitation signal by 1/4 cycle, the pulse width is an even multiple of the power frequency period, and the differential interference is eliminated while making the average value of the power frequency interference in the flow signal potential equal to zero to eliminate the power frequency interference The frequency fluctuation compensation of the power frequency power supply is to ensure that the excitation power supply and the sampling pulse can be adjusted synchronously in the dynamic fluctuation of the frequency, which truly realizes the synchronous sampling technology and synchronous excitation technology, synchronous A/D conversion, and reduces the differential interference and power frequency. the effect of interference. 2. Elimination of zero-point drift The so-called zero-point drift means that when the input signal of the sensor is zero, the output of the amplifier is not zero. The zero-point drift signal will be transmitted between the amplified circuits at all levels. After multi-stage amplification, it will become a larger signal at the output end. Since the useful signal output by the sensor is weak, the zero-point drift may drown the useful signal, making the circuit unable to normal work. Therefore, in order to suppress the zero drift, the differential circuit input of three operational amplifiers is used to realize the acquisition of weak signals with large internal resistance, so as to suppress the introduction of common mode signals. After the first-stage amplifier circuit, a DC blocking capacitor is used to filter out the zero-point drift of the baseline and prevent the DC signal from being too large and exceeding the input range of the A/D conversion. 3. Other measures to remove interference“Transformer effect”The resulting quadrature interference, using“Transmitter Zero Method”to eliminate. In terms of software design, digital filtering technology and power-down protection technology are adopted, and software instruction redundancy measures can effectively improve the reliability of input microprocessor numbers. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Anti-interference Tips for Electromagnetic Flow Meters'

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