Trial Analysis of Calibration of Electromagnetic Flow Meter

Abstract: The calibration information of the electromagnetic flowmeter is provided by the excellent flowmeter and flowmeter manufacturers. Changzhou Chengfeng has built a factory for 30 years. It has been learning and making progress. It has learned the advanced technology of foreign instruments and equipment, introduced advanced technology, and then developed new technologies on this basis, combined with customer requirements to innovate products to meet customers' requirements. need,. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the details of the calibration article on the analysis of electromagnetic flowmeters. Thirty years after the establishment of the factory, we have been learning and making progress, learning advanced technology of foreign instruments and equipment, introducing advanced technology, and then developing new technologies on this basis, innovating products according to customer requirements, meeting customer needs and satisfying The requirements of customers, the pursuit of perfection in quality and breakthrough in technology. 1. The calibration time and calibration point of the electromagnetic flowmeter are generally specified as the calibration points when evaluating the performance of the instrument: for Class A instruments, the calibration points should include qmin, 0.07qmax, 0.15qmax, 0.25qmax, 0.4qmax, 0.7qmax and qmax. When the flow rate of the last few calibration points is less than qmin, this calibration point can be ignored. For Class B instruments (referring to electromagnetic flowmeters that output analog signals or can directly display instantaneous flow), the calibration points should include at least 5 verification points including qmin and qmax, and they should be evenly distributed. Each measurement time should not be less than the shortest measurement time allowed by the device, and the shortest time should generally not be less than 30s. Ensure that the absolute value of the relative error of the number of pulses output by the flowmeter in one verification is not greater than 1/3 of the repeatability of the flowmeter under test. Fewer calibration points may be specified for non-assessed instrument performance calibrations (such as factory calibrations). 2. Calibration times and calibration cycle Calibration cycle: Verification regulations JJG198-94 'Velocity Flowmeter Verification Regulations' stipulates that for flowmeters with an accuracy of 0.1, 0.2, and 0.5, the calibration cycle is half a year. For electromagnetic flowmeters with an accuracy lower than 0.5, the calibration period is generally stipulated to be two years, and there are also longer periods. In addition, it is very difficult for some places to strictly follow the regulations in actual operation. For example, it is difficult to install and disassemble large-diameter electromagnetic flowmeters. In fact, it is difficult to achieve real-flow calibration during periodic calibration, and online periodic verification and inspection are often used. Standard times: at least three calibrations per calibration point. For Class 0.1 and Class 0.2 flowmeters, each calibration point is calibrated at least six times. 3. Calibration steps 1. Select the corresponding water pump according to the diameter and flow rate of the pipeline for the verification test; 2. If the system uses compressed air power, turn on the air compressor to reach the air source pressure required by the system to ensure the reversal 3. After the flowmeter is correctly installed and connected, it should be powered on and preheated for about 30 minutes according to the requirements of the verification regulations; 4. If a high-level tank water source is used, the overflow of the stabilized water tower should be checked. whether the signal is present. Before the formal test, the test medium should be circulated in the pipeline system for a certain period of time according to the requirements of the test procedures, and at the same time, check whether there is any leakage in the sealing parts of the pipe; 5. Before starting the formal test, the test medium should be filled with 6. When starting the test, open the valve at the front end of the pipeline and slowly open the valve behind the test flowmeter to adjust the flow at the test point. 7. During the calibration process, the flow stability of each flow point should be within 1% to 2%——The flow method, while the total amount method can be within 5%. When completing the verification process of one flow point, the temperature change of the verification medium should not exceed 1 °C, and when completing the entire verification process, it should not exceed 5 °C. The pressure downstream of the flowmeter under test should be high enough to ensure that no flash evaporation and cavitation occur in the flow pipeline (especially in the shortened diameter); 8. After each test, the test pipeline should be first The valve at the front is closed, and the pump is stopped to avoid venting the pressure stabilizer. At the same time, the remaining verification medium in the test pipeline must be emptied, and finally the control system and air compressor must be closed. Electromagnetic flowmeter, a domestic high-end flowmeter brand, takes customer demand as the first priority, and puts quality first, so that customers can use it with confidence. The reputation of electromagnetic flowmeters in the industry and customer feedback are satisfactory: high precision, durability, long service life, low failure rate, and good after-sales service. These are the evaluations and affirmations of our customers, which are the driving force for our progress. We strive to develop new technologies, improve product performance, use high-quality materials, and be meticulous about product quality to ensure a 100% pass rate for production testing. , Only do high-quality products, customer satisfaction is our driving force. The above is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Analysis of Calibration of Electromagnetic Flow Meters'
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