Integrated electromagnetic flowmeter

The integrated electromagnetic flowmeter is the first choice for conductive media and is widely used in various industrial applications, such as sewage treatment plants, printing and dyeing plants, heating equipment, and so on. 1. Composition and basic structure of an integrated electromagnetic flowmeter 1.1 Principle --- Faraday's law of electromagnetic induction Uu003dK×B×D×V Among them: U---induced electromotive force K---instrument constant B---magnetic field generated by the coil Intensity D---Measurement tube diameter V---The average fluid flow rate K, B, D are constants that are not affected by changes in medium temperature, pressure, viscosity, and density. Among them: 7, 8 are coil circuits, 1, 2, and 3 are electrode signal amplification circuits. The function of the sensor is to convert the average flow rate of the fluid into an electric potential signal, and the function of the converter is to provide current to the sensor coil (generate a magnetic field), and convert the induced electromotive force U generated by the sensor into a flow signal or display on-site after amplifying and other processing. 1.2 Composition The integrated electromagnetic flowmeter is composed of a sensor and a converter. In terms of structure, they can be integrated or combined. The wiring of the split type is shown in the figure. 2. Detection 2.1 Coil detection The coil resistance is related to the instrument specifications and caliber, generally between 15 and 150 ohms; the coil is electrically insulated from the electrode and the instrument housing, and the concept of insulation for an integrated electromagnetic flowmeter is greater than 20 MΩ . After disconnecting the connection with the converter, it can be tested with a multimeter. R7, 8u003d15---150Ω R7, 1≥20 MΩ R7, 2≥20 MΩ R7, 3≥20 MΩ R8, 1≥20 MΩ R8, 2≥20 MΩ R8, 3≥20 MΩ 2.2 Electrode detection 2.2. 1 When there is no medium in the pipeline, the electrodes are insulated. R1, 2≥20 MΩ R1, 3≥20 MΩ R2, 3≥20 MΩ 2.2.2 When there is a medium in the pipeline, the resistance between the electrodes is related to the diameter of the meter and the conductivity of the medium. The larger the diameter, the greater the resistance and the greater the conductivity. The higher the resistance, the smaller. For a 100mm caliber instrument and the medium is tap water, the resistance between the electrodes is approximately: R1, 2u003d300---600 kΩ R1, 3u003d300---600 kΩ R2, 3u003d300---600 kΩ Please note that they are Mutually symmetrical. 3. Converter detection 3.1 Coil power supply loop detection The coil power supply is usually a 'positive' and 'negative' alternating square wave constant current source, and its current value is about ±(50---300) mA, which cannot be measured directly with a multimeter. When there is a flow, the instantaneous flow display of the meter can be used for indirect detection. Without changing any wiring, the meter has an instantaneous flow value, for example: '+100m3/h'. Connect terminals 7 and 8 in reverse, and the meter should display '-100m3/h'. Disconnect terminals 7, 8 and the meter should display '0m3/h'. A diode is connected in series in the power supply loop, and the instantaneous flow value is approximately halved. 3.2 Amplification circuit detection Connect terminals 1, 2, and 3 on the converter side with two wires, and the meter should display '0m3/h'. Disconnect terminals 1, 2, and 3 on the converter side and touch terminals 2 and 3 with your hand (or screwdriver). The meter will display a 'positive' or 'negative' jump flow rate. 3.3 Output circuit detection According to the instantaneous flow rate and range displayed by the meter, calculate the current value of 4-20mA, and measure it with the current gear of a multimeter. 4. Separate type wire detection Disconnect the sensor and converter connecting wires, the same core is connected, but the different cores are insulated. 5. Conclusion For the integrated electromagnetic flowmeter, the sensor is composed of a pair of coils and 3 electrodes in contact with the medium in principle. When the coil has no external connection, it is insulated from any other circuits. Please note that if the multimeter detects no insulation, the circuit will definitely not be insulated; if the multimeter detects the insulation, the result may not be correct. If necessary, use a megohmmeter to retest. The sensor terminals '1, 2, 3' have conductivity and symmetry when there is a medium. The converter is composed of 'coil power supplyAt present, the integrated electromagnetic flowmeter industrial belts on the market are mainly concentrated in Zhejiang, Jiangsu and other regions, with different advantages. The Zhejiang regional block is mainly due to better quality and service, and the price in Jiangsu is relatively cheap. In recent years, it has been in Zhejiang. Manufacturers, their integrated electromagnetic flowmeter market share is extremely high.

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