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『Technical parameters of electromagnetic flowmeter』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
How do two sets of coils in an electromagnetic flowmeter generate a magnetic field? The two sets of coils in an electromagnetic flowmeter generate a rotating magnetic field through the phase difference of alternating current, which is a key technology for achieving accurate fluid measurement. 1. Principle of magnetic field generation: The excitation coil of the electromagnetic flowmeter is installed orthogonally, with two sets of coils arranged at a 90 ° angle in space. When AC power with a phase difference of 90 ° is applied, a synthetic magnetic field that rotates over time is generated. This rotating magnetic field can effectively overcome the electrode polarization phenomenon caused by DC excitation and improve measurement stability. According to the JB/T 9248-2015 "Electromagnetic Flow Meter" industry standard, the typical configuration is: - Excitation frequency: 6.25-100Hz adjustable - Magnetic field strength: 5-50mT (adjusted according to the pipe diameter) - Coil resistance: usually 20-200 Ω (PT100 temperature compensation) - Insulation impedance:>100M Ω/500VDC. 3. Implementation configuration points - Coil winding: High purity oxygen copper free wire only cover profile is used, interlayer insulation strength>2kV - Phase control: Accurately control the phase difference of two excitation currents (89 ° -91 °) through DSP chip - Magnetic circuit design: Using silicon steel sheet magnetic yoke to guide magnetic field lines, ensuring that the magnetic field uniformity deviation is less than 3% Safety precautions: The driving voltage of the coil is usually 60-80Vpp. During maintenance, it is necessary to confirm that the power is turned off before operating the hole. Strong magnetic fields may affect surrounding 
2. Parameters of electromagnetic flowmeter
The main parameters of electromagnetic flowmeter include nominal diameter, accuracy, nominal pressure, electrode form and material, lining material, output signal type, working voltage, shell protection level, and electrode inner diameter, etc. Here is a detailed description of these parameters Nominal diameter: This is the standard diameter of the electromagnetic flowmeter pipeline, usually expressed in DN (nominal diameter), measured in millimeters. It has multiple specifications, such as DN
10, DN1
5, DN20, etc. The appropriate specifications can be selected according to the actual size and flow requirements of the pipeline to ensure the normal installation and accurate measurement of the flowmeter.
2. Precision: The accuracy of an electromagnetic flowmeter represents the degree of closeness between the measurement result and the true value, usually expressed as a percentage. For example, the measurement accuracy of a certain electromagnetic flowmeter is ± 0.5%, which means that the error between the measured value and the actual value is within ± 0.5%. High accuracy is the key to ensuring measurement accuracy. 3. Nominal pressure: This refers to the maximum working pressure that the flowmeter can withstand. Electromagnetic flow meters of different specifications have different nominal pressure values, such as 1.6MPa, 1.0MPa, etc. When choosing, the appropriate nominal pressure level should be selected based on the actual working pressure. Electrode form and material: The elect