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Introduction to the new development of electromagnetic flowmeter

In the past, the calibration of the electromagnetic flowmeter had to be sent to a special calibration and calibration device for inspection. However, with the development of electromagnetic flowmeter manufacturing technology and the expansion of the application industry, the use of electromagnetic flowmeters is increasing, the caliber is getting larger and larger, and it is more and more difficult to check back on the verification device. Especially in the water supply industry, due to the large diameter of the application and the characteristics of the industry, it is difficult to operate by taking off the flow and taking out the checkout. It is time-consuming and laborious, and even impossible to remove.

However, according to the requirements of the ISO9001 quality management system, each enterprise needs to perform regular inspection as an electromagnetic flowmeter for measuring instruments. To this end, the application and manufacturer of electromagnetic flowmeters have been struggling to find an online electromagnetic flowmeter inspection method to replace the traditional offline calibration method.

On-line inspection method of electromagnetic flowmeter commonly used at home and abroad: On-line verification method of large-caliber electromagnetic flowmeter In the 1990s, Shanghai Waterway System began to explore online inspection and verification. They used a dedicated analog signal detector to detect the converter, and the sensor inspection The test electrode is connected to the liquid resistance, and the in-vibration coil includes the insulation resistance and the copper resistance of the excitation connection cable, and the indirect method of checking the excitation current of the converter output and checking the magnetic field strength. In the pipeline with the stop flow condition, enter the hole from the vicinity of the sensor, check the electrode and lining for contamination, deposition and clean.

Online electromagnetic calibrator GS9 electromagnetic flowmeter is the most used in Europe, and its online inspection technology is also the most mature. Some major electromagnetic flowmeter manufacturers have developed a dedicated electromagnetic flowmeter online detection instrument based on the above method, such as KROHNE. GS9 online electromagnetic flowmeter calibrator. The instrument is used as a calibrator for comprehensive detection of electromagnetic flowmeter sensors and converters. The detection includes electrode signal, analog flow output measurement, field excitation current measurement, current and frequency output measurement, coil and electrode. Resistors, etc., and record the data, the electromagnetic flowmeter can also be transmitted to the PC.

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