Electromagnetic flow meter scale performance index and test methods

Abstract: the electromagnetic flow meter scale performance index and test methods of information produced by excellent flow meter, flow meter manufacturer to offer you the quotation. With the progress of the society, e used in the field of technology development and market expanding, the technology level of electromagnetic flowmeter is higher and higher, more and more stable and reliable performance. Electromagnetic flowmeter has a unified international and national standards to test and assess its performance. More flow meter manufacturers choose model price quote you are welcome to inquire, here is the electromagnetic flowmeter scale performance index and test method the article details. With the progress of the society, e used in the field of technology development and market expanding, the technology level of electromagnetic flowmeter is higher and higher, more and more stable and reliable performance. Electromagnetic flowmeter has a unified international and national standards to test and assess its performance. Manufacturing process of electromagnetic flow transducer and in the process of inspection, maintenance, also need to use a certain method to test. Especially the hencoop contemporary converter and sensor can swap, more should make individual inspection and test for the converter. Therefore, this section expounds the main technical performance index of typical converter. A, the test for converter basic converter performance tests, you need to use the simulation of the flow signal rectangular wave signal generator ( Signal generator is factory set up standard system) , digital voltmeter, digital frequency meter standard instrument, etc. For impact test, the amount of water in addition to the use of simulation of traffic signal rectangular wave signal generator, digital voltmeter, digital frequency standard instrument, test standard stipulated by the special test equipment must be used, as stipulated in the standard method. Figure 4 - 60 said converter basic circuit connection and equipment testing, here, the dc output current test is to use the standard 250 ohm resistor, 4. L ~ 20 ma current transform Sv voltage test. Because digital voltmeter is the basic measure of voltage, measure current is transformed, thus the precision of the digital voltmeter measurement voltage is higher than the precision of the measuring current. Basic error and repeatability of measurement, generally can be done at the same time, experimental data of the public, are calculated respectively. Affect the amount of testing is the product content, general enterprise can only make part of the project, many test need to entrust the industry authority of the professional laboratory, such as electromagnetic compatibility test and explosion-proof performance test. Second, the analog signal generator series converter excitation current output circuit people, small resistance, pure resistance R of the sampling resistance at both ends of the voltage drop is proportional to size, excitation current and the waveform, phase and frequency of the exciting current is consistent, can represent the flow signal. Standard signal generator is use precision and standard Tun resistance to electromagnetic flow converter to produce low-frequency rectangular wave excitation current of the transformation as the pulse voltage, then stability by high precision, high pressure resistance points, obtained the low-frequency rectangular wave v signals as the simulation flow, provide electromagnetic flow converter input signal, is used for velocity test, linear set. Standard signal generator to simulate the flow of flowmeter, the converter's ability to identify flow to check the electromagnetic flow. Electromagnetic flowmeter standard signal generator with internal operation timing automatic power control circuit, to prevent the battery when not in operation consumption. Here, a typical example of the standard signal generator technical performance indicators are as follows: the velocity signal amplitude: around 340 TCVP - per 1 m/s p; Error: basic & plusmn; 0. 1% : velocity setting precision: reading & plusmn; O. 我%; Stability: & plusmn; 0. 05%，4h； Temperature stability: 20 & times; 10 - 6 / o; The flow asymmetry: & plusmn; 0. 05%. Three transmission method, interchangeability and its value of converter and interchangeability of sensor used for field application, maintenance, repair and production process management, respectively has the very vital significance. Electromagnetic flowmeter are interchangeable can also reduce spare parts of reserves, save money. And factory interchangeability form the standardization production, improve efficiency, ensure the quality, reduce the cost of electricity is effective measures, so compatibility is pay close attention to by users and manufacturers. White since the 1970 s, the interchangeability Tuo electromagnetic flow meter has gradually mature. So, how to realize the compatibility? We make the analysis: the sensor manufacturing and assembly of the excitation device and it is difficult to achieve the umbrella is consistent, the limited length of the magnetic field and the influence of eddy current, measurement of tube of limited length, the measuring tube processing error, these factors result in the actual production of sensor measurements of dispersion problem difficult to solve. Therefore, realization of swap hope is to solve in the converter. For constant current source excitation converter, interchangeability requires that all of the same model converter in addition to the exciting current is consistent, amplifier gain, conversion coefficient also should agree.

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