Introduction to dry calibration test of Weltai electromagnetic flowmeter

Abstract: The information about the dry calibration test of Weltai electromagnetic flowmeters is provided by the excellent manufacturers of flowmeters and flowmeters. 2011-09-06, in Shanghai Keyang, under the guidance of Russian experts, in my country, the first use of the electromagnetic flowmeter dry standard device (POTOK-T) provided by Russia was successfully used for Shanghai Weltek in August. On the 25th, the wet standard test was qualified, and the company's caliber was 300 mm. For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. 2011-09-06, in Shanghai Keyang, under the guidance of Russian experts, in my country, the first use of the electromagnetic flowmeter dry standard device (POTOK-T) provided by Russia was successfully used for Shanghai Weltek in August. On the 25th, the wet standard test passed the dry standard of the company's straight-through electromagnetic flowmeter with a diameter of 300 mm. The dry labeling results are in good agreement with the wet labeling results, with a maximum error of 0.33%. one. Picture of the test operation process. (1) Two. The principle of dry standard device calibration. The calibration of the device adopts a separate calibration method for the electromagnetic flowmeter sensor and the electromagnetic flowmeter converter. The method used for the calibration of this dry standard device is the surface weight function method. The mutual inductance between the winding coil in the sensor and the electromagnetic flowmeter sensor is simulated by using the dry standard produced by the equivalent of the surface weighting function. When the magnetic field in the electromagnetic flow sensor pipeline is alternating, the voltage signal output by the MFC sensor is measured, from It can realize the dry calibration of electromagnetic flow sensor. Since the surface weight function contains flow field information such as flow velocity distribution, different dry standard simulation sensors can be made according to the actual flow field, and then combined with the dry standard device to complete the electromagnetic flow sensor coefficient Kf dry calibration under different flow fields. Then by using electromagnetic flow converter and dry standard device, the verification of electromagnetic flow converter coefficient Km is completed. Then calibrate the flow point to be measured by adjusting the resistance of the resistance box. three. Test tools, measurement procedures and test results for dry calibration. 1. The sample tested is Shanghai Weiltai electromagnetic flowmeter. The test tools used are: 1. Dry standard test device. 2. Resistance box. 3. Computer with test software. 2. Test process. 1. Through the electromagnetic flowmeter manual, determine the electromagnetic flow sensor, the excitation of the converter and the port of the electrode, and then determine the position of the fixture on the dry standard simulation sensor by measuring the distance between the two flange end faces of the electromagnetic flowmeter for many times, and then simulate the dry standard The sensor is placed in the flow sensor tube and marked as shown in (2). After completing the preparatory work, connect as shown in Figure (1), and then measure the conversion coefficient Kf value of the sensor through the host computer software. Perform multiple measurements of Kf to obtain the average Kf’, this Kf’As the data of the dry calibration of the flowmeter at the factory. 2. Connect the access end of the excitation signal line of the electromagnetic flow sensor in the circuit diagram, and then measure the conversion coefficient Km value of the flowmeter converter through the host computer software and dry standard detection device. For dry calibration, Kf needs to be measured again at this time as the test data when the instrument is calibrated on site. 4. Set Kf’Fill in the corresponding position of the host computer software, Kf and Km have been automatically saved. 5. After completing the above work, carry out the verification of the flowmeter. Each calibration point is calibrated by adjusting the resistance value of the resistance box. 6. After the calibration is completed, the data is automatically saved in the corresponding directory. 3. Results of dry calibration tests (see appendix). It can be seen from the comparison between the calibration results and the wet calibration results that the test data and errors are very small and can meet the test requirements. Four. Features of dry label. Electromagnetic flowmeter dry calibration technology is an advanced technology that can achieve calibration without actual fluid flowing through the electromagnetic flow sensor pipeline. Its characteristics are mainly reflected in: the calibration process does not require a lot of energy consumption. No need to build expensive standard units. Applicable to the calibration of pipeline and insertion flowmeters. Measurement is convenient and fast. Appendix 1. Test results The above is the entire content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Introduction to Dry Calibration Test of Weltai Electromagnetic Flow Meters'

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