Hardware anti-interference technology of intelligent electromagnetic flow meter

Abstract: The hardware anti-interference technical information of intelligent electromagnetic flow meter is provided by excellent flow meter and flow meter manufacturers. 1. The new excitation technology is an important means to improve the anti-interference ability of the intelligent electromagnetic flowmeter. The development of electromagnetic flowmeter excitation technology not only reduces the influence of electrode polarization potential, mud interference and flow noise, but also changes the form of power frequency interference, which is convenient for Synchronize. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the hardware anti-interference technical article of the intelligent electromagnetic flowmeter. 1. The new excitation technology is an important means to improve the anti-interference ability of the intelligent electromagnetic flowmeter. The development of electromagnetic flowmeter excitation technology not only reduces the influence of electrode polarization potential, mud interference and flow noise, but also changes the form of power frequency interference, which is convenient for Synchronous sampling technology deals with power frequency interference noise to avoid the influence of power frequency interference. At present, the electromagnetic flow sensor adopts power frequency frequency synchronous three-value low-frequency rectangular excitation and dual-frequency rectangular wave excitation, thereby improving the entire anti-interference ability of the electromagnetic flowmeter and improving the measurement accuracy and reliability of the electromagnetic flowmeter. 2. The design of the preamplifier is the primary link to improve the anti-interference ability. The output flow signal of the electromagnetic flow sensor is very weak and the internal impedance is high. Therefore, the high input and input impedance, low drift, low noise, and high CRMM preamplifier can meet the anti-in-phase common mode interference requirements. The preamplifier adopts JFET high input impedance voltage buffer, low drift and low noise subtractor, and precision resistance is carefully matched to form an instrument amplifier, and adopts input protection technology, common mode voltage bootstrap technology and grounding technology to greatly improve the resistance to common mode interference. ability to suppress the effects of zero drift. 3. Frequency compensation technology of synchronous sampling Synchronous sampling and power frequency power frequency monitoring and compensation technology are effective methods to improve the ability to resist power frequency interference mixed in the flow signal potential and power frequency interference caused by power frequency power frequency fluctuations. Synchronous sampling technology, the sampling pulse width is an integer multiple of the power frequency period, so that the average power frequency interference in the flow signal potential is equal to zero, so as to eliminate the influence of the power frequency interference; the frequency fluctuation compensation of the power frequency power supply is to ensure the dynamic fluctuation of the frequency. , the excitation power supply and the sampling pulse can be adjusted synchronously, the real realization of synchronous sampling technology and synchronous excitation technology, synchronous A/D conversion, in order to reduce the influence of power frequency interference. 4. Adopting the new HCMOS series chip technology. Compared with the 74LS series chip, the 74HC series chip technology is used to increase the low noise tolerance by 2.4 times and the high noise tolerance by 2.1 times. The entire hardware of the intelligent electromagnetic flowmeter adopts the 74HC series chip, which not only reduces the overall power consumption, and improve the anti-interference ability of the components themselves, laying a foundation for the integration of small and lightweight power flow meters. 5. Microprocessor system power supply voltage monitoring technology In the microprocessor system of the intelligent electromagnetic flowmeter, when the power supply is transiently under-voltage, the excitation switch pulse action will cause the microprocessor to malfunction, data loss, etc., so a reliable reset circuit must be used. and power supply voltage monitoring technology. The most simple and practical method is to use a low-cost power supply with a high-sensitivity power supply voltage monitor to improve the microprocessor system and anti-interference ability. As shown in Figure 4, the microprocessor voltage monitor adopts the TL7705CP power supply voltage monitor chip, which can generate a reliable reset signal when the power supply is powered on and the power supply is under-voltage instantaneously. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Hardware anti-interference technology of intelligent electromagnetic flow meter'
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