Performance index and test method of electromagnetic flow meter

Abstract: Electromagnetic flow meter performance indicators and test method information are provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. With the progress of society, the development of technology and the expansion of the market, the technical level of electromagnetic flowmeters is getting higher and higher, and the performance is more and more stable and reliable. Electromagnetic flowmeters already have unified international and national standards to test and assess their performance indicators. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the performance indicators and test methods of electromagnetic flowmeters. With the progress of society, the development of technology and the expansion of the market, the technical level of electromagnetic flowmeters is getting higher and higher, and the performance is more and more stable and reliable. Electromagnetic flowmeters already have unified international and national standards to test and assess their performance indicators. In the manufacturing process, inspection and maintenance process of the electromagnetic flow converter, certain methods also need to be tested. Especially since contemporary converters and sensors can be interchanged, the converters should be checked and tested separately. To this end, this section clarifies the key specifications of a typical converter. First, the test of the converter For the basic performance test of the converter, it is necessary to use a square wave signal generator that simulates the flow signal (the signal generator is a standard system established by the manufacturer itself), a digital voltmeter, a digital frequency meter and other standard instruments. For the influence quantity test, in addition to the use of the rectangular wave signal generator, digital voltmeter, digital frequency and other general standard instruments for analog flow signals, the special test equipment specified in the test standard must be used, and the method must be carried out according to the standard. Figure 4-60 shows the circuit connection and equipment for the basic test of the converter. Here, the DC current output test uses a standard 250 ohm resistor to convert the 4.20mA current into a voltage of 1 ~ Sv for testing. Because the basic measurement of the digital voltmeter is voltage, and the measured current is transformed, the accuracy of the digital voltmeter to measure the voltage is higher than that of the current. The basic error and repeatability measurement methods can generally be carried out at the same time, and the test data are shared and calculated separately. The test of the impact quantity is the content of the product test. Generally, enterprises can only do part of the project. Many tests need to be entrusted to professional laboratories of authoritative institutions in the industry, such as electromagnetic compatibility test and explosion-proof performance test. 2. The analog signal generator is connected in series with the sampling resistor of the small resistance value and pure resistance R of the excitation current output loop of the converter, and the voltage drop across the two ends is proportional to the excitation current, which is consistent with the waveform, phase and frequency of the excitation current, which can represent flow signal. The standard signal generator converts the low-frequency rectangular wave excitation current generated by the electromagnetic flow converter into a pulse voltage with a precise and standard resistor, and then divides the voltage by a high-precision and high-stable resistor to obtain a low-frequency rectangular wave teaching voltage signal as an analog signal. The flow signal is provided to the signal input end of the electromagnetic flow converter for flow rate setting and linearity check. The standard signal generator can simulate the flow direction of the flowmeter and check the ability of the electromagnetic flow converter to discriminate the flow direction. The electromagnetic flowmeter standard signal generator has a non-operation timing automatic power-off control circuit inside to prevent battery consumption when not in operation. Here, the typical technical performance indicators of standard signal generators are as follows: Velocity signal amplitude: about 340tcVp-p per 1 m/s; Basic error:±0.1%: Flow rate setting accuracy: of reading±O.I%; Stability:±0.05%, 4h; temperature stability: 20×l0-6/o; flow asymmetry:±0.05%. 3. Interchangeability and transfer method of setting value The interchangeability of converters and sensors used together is of great significance for field application, maintenance and repair, and separate management of production processes. The interchangeability of electromagnetic flowmeter can also reduce the reserve of spare parts and save money. Moreover, the interchangeability of manufacturing plants forms standardized production, improves efficiency, and ensures quality. Electricity is an effective measure to reduce costs, so interchangeability is closely watched by users and manufacturers. Since the 1970s, the interchangeability of electromagnetic current meters has gradually matured. So, how to achieve interchangeability? We make the following analysis: It is difficult for the excitation device and the manufacturing assembly of the sensor to be completely consistent. The limited length of the magnetic field and the influence of the eddy current, the limited length of the measuring tube, and the processing of the measuring tube all have errors. These factors cause the actual production. The problem of dispersion of sensor measurements is difficult to solve. Therefore, the hope of realizing the interchange is solved in the converter.
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