When electromagnetic flowmeters are used, what do we need to pay attention to? Today Huai'an Wanfeng makes a simple explanation for everyone. I hope you pay attention to the following points: The performance of the electromagnetic flowmeter and the length of its life are inseparable from its daily maintenance and management. Just like the maintenance of the automobile, under the good maintenance and management system, the electromagnetic flowmeter is very strong. , The following will introduce to you in the use of electromagnetic flowmeter in the maintenance and management of what work is done. The new types of flow meters continue to emerge, with a wide variety of products and varying performance. Their operating conditions and technical parameters are also different. Based on the actual applications, existing problems, installation difficulties, and performance of various flow meters used in the past. The price ratio and other issues have been carefully analyzed and compared. It is believed that the electromagnetic flowmeter has the advantages of sensitive response, good linearity, high accuracy, and is free from the influence of temperature, viscosity and other factors of the measured medium during the measurement process. 1. The electromagnetic flowmeter has high accuracy, good linearity and stable operation, which improves the accuracy of measurement and the credibility of the data. It overcomes the unstable operation of some instruments, which results in the problem of unreliable measurement data. After many on-site comparisons, the errors were within the control range, which enhanced the trust of the instrument and ended the unscientific measurement method of calculating the water volume according to the performance curve of the pump. Human Factors. 2, electromagnetic flowmeter structure is simple, the sensor has no moving parts, there is no measurement error or instrument failure due to mechanical wear or contaminant winding, so the failure rate is very low, maintenance is greatly reduced, thus saving a lot of manpower and material resources. 3, electromagnetic flowmeter has a variety of interface circuits, can be easily connected with the data acquisition terminal or computer, to achieve data acquisition, analysis, management automation. The management of the electromagnetic flowmeter 1. Establish an electromagnetic flowmeter operation file, including the flowmeter manufacturer, model, production date, installation site, pipe diameter, calibration time, etc., in order to facilitate maintenance and management of the instrument. 2. Strengthen the inspection work and conduct regular test calibration. We mainly use two methods, one is to use a portable flowmeter with a relatively high accuracy and electromagnetic flowmeter for measurement and comparison; the second is to use a flowmeter checker to verify the flow converter and check various items. The technical specifications are correct and the test data is archived. 3. Compare the test data with the previous test results, carefully analyze and study the suspicious data that appears, find the possible causes, handle the solution in time, and make an analysis report of the flowmeter operation.
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1, routine maintenance
Only need to make periodic visual inspection of the instrument, check the surrounding environment of the instrument, sweep dust, ensure that there is no water and other substances, check whether the wiring is good, check whether there is new equipment with strong electromagnetic field near the instrument or there is a newly installed wire across the instrument.
If the measuring medium is easy to contaminate the electrode or in the measurement of the wall sedimentation, scaling, should be regularly cleaned, cleaned.
2, fault finding
After the meter has been put into operation or normal operation for a period of time, it is found that the meter is not working properly. First, check the external conditions of the meter, such as whether the power supply is good, whether the pipe is leaking or is not in a full pipe state, whether air bubbles are in the pipe, and whether the signal cable is Damaged, converter output signal (ie, the rear instrument input circuit) is open. Remember to blindly remove the flowmeter.
3, sensor inspection
Test equipment: 500MΩ insulation resistance tester, a multimeter.
Test steps:
(1) When the pipeline is full of media, use a multimeter to measure the resistance between the terminals A, B, and C. The resistance between AC and BC should be as large as equal. If the difference is more than 1 time, it may be the leakage of the electrode, the measurement of the outer wall of the tube or the adsorption of condensed water in the junction box.
(2) When the liner is dry, use MΩ meter to measure the insulation resistance between AC and BC (should be greater than 200MΩ). Then use a multimeter to measure the resistance of the two terminals in the terminals A, B and the measuring tube (should be short-circuit connected). If the insulation resistance is very small, indicating electrode leakage, the entire flowmeter should be returned to the factory for repair. If the insulation is reduced but there is still more than 50MΩ and the inspection result of step (1) is normal, the outer wall of the measuring tube may be damp, and the interior of the housing may be dried by a hot air blower.
(3) Use a multimeter to measure the resistance between X and Y. If the resistance exceeds 200Ω, the excitation coil and its lead wire may be open or poorly connected. Remove the terminal board check.
(4) Check that the insulation resistance between X, Y and C should be more than 200 MΩ. If there is a decrease, use the hot air to dry the inside of the housing. In actual operation, a decrease in coil insulation will lead to an increase in measurement error and instability of the output signal of the instrument.
