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『Selection 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)
1. How to adjust parameters of electromagnetic flowmeter
Parameter adjustment of electromagnetic flowmeter needs to be configured according to the model and working conditions of the instrument. The core operations include setting the first number of the instrument system, adjusting the range, and calibrating the signal output. 1. Basic parameter settings • Instrument coefficient (K coefficient): Input according to the original coefficient marked on the sensor nameplate, usually the number of pulses per liter (e.g. 1.0000 represents 1L=1 pulse) • Measurement range: Calculated according to the pipeline diameter and flow rate range, the flow rate range of industrial pipelines is generally set to 0.5-10m/s • Flow unit: can choose m ³/h, L/min, kg/h, etc. (mass flow rate requires additional input of medium density) 2 Medium parameter configuration • Conductivity threshold: usually set to 5 μ S/cm, below which an empty pipe alarm will be triggered • Density setting: When measuring mass flow, the current medium density value under the working condition needs to be input • Viscosity compensation: For high viscosity media, the viscosity compensation function needs to be enabled (dynamic viscosity value needs to be input) 3 Output signal calibration • 4-20mA output: - Zero calibration: adjust the output to 4mA in no flow state - Full range calibration: adjust the output to 20mA at rated flow rate • Pulse output: - Set the pulse equivalent (the flow value represented by each pulse) - Adjust the pulse width (usually set to 50-500ms) 4. Special function settings • Automatic air traffic detection: automatically reset the output when the pipeline is empty after being enabled • Flow direction judgment: forward/reverse flow d
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1. Parameter modification requires the use of specialized configuration software or handheld programmer provided by the manufacturer. 2 After modifying the key parameters, on-site real flow calibration must be carried out to verify the accuracy Parameter modifications involving safety interlocks require prior approval of process changes In explosion-proof situations, it is prohibited to open the cover with electricity. The power must be cut off before operation (note: specific operation should be based on the equipment manual, and this article is written according to the current GB/T 18659-2018 national standard for electromagnetic flow meters in 2024)
2. Working principle and selection of electromagnetic flow meters
Working principle of electromagnetic flow meters The measurement principle of electromagnetic flow meters is based on Faradays law of electromagnetic induction. The sensor part consists of a coil, electrodes, and insulating lining. The specific working process is as follows: magnetic field generation: the excitation coil in the sensor generates a magnetic field perpendicular to the direction of fluid flow after being energized. Induced electromotive force generation: When a conductive fluid passes through a magnetic field, a small induced electromotive force is generated in the fluid due to the cutting of magnetic field lines. Signal acquisition and processing: The electrode collects the induced electromotive force and sends it to the converter section. The converter amplifies and corrects the signal, converts it into corresp