How to judge whether the quality is good or bad after purchasing an electromagnetic flow meter?

Abstract: How to judge the quality of electromagnetic flowmeter after purchasing it? The information is provided by excellent flowmeter and flowmeter manufacturers and quotation manufacturers. How to judge the quality of the electromagnetic flowmeter after purchasing it? 1. Generally, the resistance value of the magnetic coil and the contact resistance value of the electrode and the liquid are measured by a multimeter to comprehensively judge the performance of the instrument. Electromagnetic flowmeter is a volume flow measurement instrument, in the measurement process, it. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is how to judge whether the quality is good or bad after purchasing an electromagnetic flowmeter? The article details. How to judge whether the quality of the electromagnetic flowmeter is good or bad after purchasing it? 1. Generally, the resistance value of its magnetic coil and the contact resistance value between the electrode and the liquid are generally measured by a multimeter to comprehensively judge the performance of the instrument. Electromagnetic flowmeter is—A volume flow measuring instrument, in the measurement process, it is not affected by the temperature of the measured medium. Influence of viscosity, density and conductivity (within a certain range). Therefore, the electromagnetic flowmeter can be used to measure the flow of other conductive liquids only after being calibrated by water, without any additional corrections. The transmitter of the electromagnetic flowmeter has a simple structure, no moving parts, and no throttling parts that hinder the flow of the fluid, so when the fluid passes through, it will not cause any additional pressure loss, and it will not cause problems such as wear, blockage, etc. It is especially suitable for measuring ore pulp with solid particles, liquid-solid two-phase fluids such as sewage, and various viscous slurries. Also, because it has no moving parts in its structure, it can be made of electrodes by attaching a corrosion-resistant insulating lining and selecting corrosion-resistant materials, which has good corrosion resistance and can be used for the measurement of various corrosive media. 2. When purchasing an electromagnetic flowmeter, you must correctly select and install the special instrument. It is one of the major types of instruments in process automation instruments and devices. It is widely used in metallurgy, electric power, coal, chemical industry, petroleum, transportation, construction, textile, food, medicine, agriculture, environmental protection and people's daily life. Various fields of economy are important tools for developing industrial and agricultural production, saving energy, improving product quality, improving economic efficiency and management level, and occupying an important position in the national economy. 3. Using the visual inspection method and the instrument method, use GS8 to check whether the resistance value of the excitation coil of the sensor, the insulation resistance between the signal lines, the grounding resistance and other items meet the standards before leaving the factory, and whether the zero point and output current of the electromagnetic flowmeter converter meet the requirements precision requirements. The specific detection methods are as follows: (1) Measure the resistance of the excitation coil to determine whether the excitation coil has an inter-turn short circuit (measurement line number“7”and“8”resistance value), the resistance value should be between 30 ohms and 170 ohms. If the resistance is the same as the factory record, the coil is considered to be good, and the magnetic field strength of the electromagnetic flowmeter sensor has not changed. (2) Measure the excitation coil to the ground (measurement line number“1”and“7”or“8”) insulation resistance to judge whether the sensor is damp, the resistance value should be greater than 20 megohms. (3) Measure the contact resistance between the electrode and the liquid (measurement line number“1”and“2”and“1”and“3”) to indirectly evaluate the general condition of the electrode and lining surface. For example, whether the electrode surface and the lining layer are attached to the deposition layer, and whether the deposition layer is conductive or insulating. The resistance value between them should be between 1 kiloohm and 1 megohm, and the wire size“1”and“2”and“1”and“3”The resistor values ​​should be roughly symmetrical. (4) Close the valve on the pipeline and check the zero point of the whole machine when the electromagnetic flowmeter is filled with liquid and the liquid does not flow. Make appropriate adjustments as appropriate. (5) Check the insulation resistance of each core wire of the signal cable and excitation cable, and check whether the shielding layer is in good condition. (6) Use the GS8 calibration instrument to test the output current of the converter. When given zero flow, the output current should be: 4.00mA; when given 100% flow, the output current should be: 20.00mA. The error of the output current value should be better than 1.5%. (7) Test the excitation current value (converter terminal“7”and“8”between), the positive and negative values ​​of the excitation current should be within the specified range, roughly 137 (5%) mA. 4. The influence of the external environment of the electromagnetic flowmeter on it: such as the excitation line and the signal line are laid in the same pipeline, the excitation line and the signal line are parallel to the high-voltage cable, and there are large transformers or motors around the influence on the operation accuracy of the electromagnetic flowmeter. Evaluation, this evaluation mainly uses the visual method to observe whether the electromagnetic flowmeter in operation has sudden changes or fluctuations, and roughly judge whether the electromagnetic flowmeter is disturbed by electromagnetic waves or other stray waves or whether there are air bubbles in the pipeline.
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