Take measures when the signal output by the electromagnetic flow meter exceeds the full scale value

Abstract: The signal output by the electromagnetic flow meter exceeds the full scale value and the information to take measures is provided by the excellent flow meter and flow meter manufacturers and quotation manufacturers. Electromagnetic flowmeter is widely used in sewage, fluorine chemical, production water, tap water industry, medicine, steel and many other aspects. Because of the principle of electromagnetic flowmeter, it can only measure conductive liquid. But the electromagnetic flowmeter is in terms of reliability and stability. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the measures to be taken when the signal output by the electromagnetic flowmeter meter exceeds the full value. Electromagnetic flowmeters are widely used in sewage, fluorine chemical, production water, tap water industry, medicine, steel and many other aspects. Because of the principle of electromagnetic flowmeter, it can only measure conductive liquid. However, electromagnetic flowmeters are relatively better than other types of flowmeters in terms of reliability and stability, but some problems will still occur in the actual use process of users. The following technologies mainly introduce the problems of the output signal of the electromagnetic flowmeter: 1. The electromagnetic flowmeter determines whether the cause of the fault is before the converter or the lower instrument inspection process item 1 after the converter. The fault is before the converter, that is, the signal cable between the sensor and the sensor/converter (integrated electromagnetic flowmeter signal connection line, inside the instrument, generally rarely fails); after that, it is accumulated in the sensor itself and after lower-level instruments such as a controller or a flow computer. First pass water in the piping system and flow sensor, short-circuit the two signal terminals of the converter and the functional ground or protection ground terminal in a static state without flow, and observe whether the output signal of the converter is sufficient to zero. If it can reach zero, it can be preliminarily judged that the fault is not in the converter itself and the rear instrument before the conversion. The next step can focus on checking the connecting cable and sensor; if it cannot reach zero, the inspection center of gravity should be on the converter and the rear instrument. . 2. The electromagnetic flowmeter confirms the integrity of the signal cable and that the two electrode fields are in full contact with the liquid. Check Process Item 2. If the signal loop is disconnected, the output signal will exceed the full scale value, so this inspection item is mainly to verify that the flow signal loop is complete and unobstructed. The signal loop includes cables and their connecting terminals, a pair of electrodes of the flow sensor and the liquid between the electrodes. In addition to checking the continuity of the circuit, it is also necessary to verify the cable type, the correctness of the connection of each contact, and whether the insulation meets the requirements. The electrode of the flow sensor is not in contact with the liquid (both electrodes are not in contact with the liquid or one electrode is not in contact with the liquid, and the signal cable is also disconnected. The flow sensor must be refitted to a position that can be filled with liquid, etc. to eliminate the reason why the electrode is not in contact with the liquid. 3. Check the correctness of the set value of the converter for the electromagnetic flowmeter, and check item 3 of the zero point and full point inspection process. When the separate electromagnetic flowmeter leaves the factory, the general converter and sensor are in accordance with the caliber, flow rate and set parameters specified in the contract. For real current calibration, the sensor and the converter must be in one-to-one correspondence. Therefore, first check whether the matching is correct, and then check whether the instrument constant of the converter and each parameter are in compliance. Then use the analog signal device to recheck the zero point. The integrated instrument does not need to check this item. 4. Item 4 of the inspection process of the lower (rear) instrument in the electromagnetic flowmeter inspection. The output flow signal of the electromagnetic flow converter is transmitted to the lower instrument such as the flow totalizer and flow computer. If the rear instrument is connected with electricity (that is, an active load) ), the power supply feedback on the load damages the output circuit of the converter, and the output signal exceeds the full scale value, so electrical isolation measures should be taken. The output circuit of the converter has two types: grounding is allowed and grounding is not allowed. If grounding is allowed, the output is still If it exceeds the full scale value, the converter is faulty; if the grounded person is not allowed to be grounded by mistake, as long as the grounding is removed, it can operate normally. 5. Check the electromagnetic flowmeter to check the electrical interference from the liquid. Check item 5. In the case of no excitation current , use a multimeter or an oscilloscope to detect the interference potential at the two electrodes. This fault phenomenon often occurs in the sodium chloride electrolysis process of the alkali industry and the cathodic protection pipeline. Measures can be taken to insulate the electromagnetic flow sensor from the pipeline to make the The electrode and the liquid are at the same potential. 6. The reason for the fault of the electromagnetic flow inspection converter itself, which causes the output signal to exceed the full scale value, is more complicated. It can be caused by a certain link in the circuit of each unit in the converter. There is a big difference. For the general use unit, the circuit board of the contemporary electromagnetic flowmeter can be divided into interchangeable and independent units, and the test and replacement of the spare circuit board can be used to check the judgment. First check the sixth item of the process, that is, check the input / Output circuit. According to the characteristics of the two types of analog circuit converters or digital circuit converters, focus on checking several links. For analog circuit converters, the feedback loop should be open and whether the output loop is damaged. The analysis of the ND conversion circuit and the output circuit should be the main inspection link.“Technology guarantees quality, innovation promotes development, and integrity weaves the future”, adhering to its own firm belief, and created a development path suitable for its own characteristics. Looking back, we firmly believe that,“factory”The future of our company is bound to be a sunny avenue full of flowers and smiling faces! The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our manufacturer. 'Measures to be taken when the signal output by the electromagnetic flow meter exceeds the full scale value'
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