The performance characteristics of electromagnetic flow meter

Abstract: The information on the performance characteristics of electromagnetic flowmeters is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. According to the characteristics of the electromagnetic flowmeter transmitter, the converter must have the following performances. 1. Stable linear amplification The electromagnetic flowmeter should have a linear amplifier with high stability, which can amplify the flow signal of several millivolts to a high enough electricity. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the performance characteristics of the electromagnetic flowmeter. According to the characteristics of the electromagnetic flowmeter transmitter, the converter must have the following performances. 1. Stable linear amplification The electromagnetic flowmeter should have a linear amplifier with high stability, which can amplify the flow signal of several millivolts to a high enough level. 2. It can distinguish and suppress various interference signals for orthogonal interference. , In addition to the zero adjustment of the interference adjustment mechanism of the transmitter in the submersible electromagnetic flowmeter, an anti-interference mechanism should also be set in the converter to eliminate the remaining orthogonal interference signals in the transmitter. Otherwise, these remaining quadrature interference signals will also be amplified by the main amplifier, which will seriously affect the work of the instrument. The method of the converter to suppress the quadrature interference is to identify and separate the quadrature interference signal amplified by the main amplifier, and then feed it back to the input end of the main amplifier to cancel the quadrature interference signal coming from the input end. For in-phase interference, Shan Yu The causes are more complicated, and there are many ways to suppress them. On the transmitter side, the shape, size and performance parameters of the electrode and the excitation coil should be balanced and symmetrical. Reduce the effect of distributed capacitance between the electrode and the excitation coil. In addition, a separate and good grounding is very important, and reducing the grounding resistance can reduce the in-phase interference potential caused by stray currents. In terms of converters, the anti-in-phase interference capability of the instrument must also be improved, and a differential amplifier circuit is usually used in the preamplifier stage of the converter. This is to use the high common mode rejection ratio of the differential amplifier, so that the in-phase interference signal entering the input end of the electromagnetic flowmeter converter cannot be amplified and suppressed. If a constant current source circuit is added to the front differential amplifier stage of the converter, the in-phase interference can be better suppressed. 3. A high enough input impedance converter must have a high enough input impedance to overcome the influence of the change of the internal resistance of the transmitter and improve the measurement accuracy. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Performance Characteristics of Electromagnetic Flow Meters'

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