Technical requirements for electromagnetic flowmeter | Measurement requirements for electromagnetic flowmeter

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DateTime 07/26/2026 Show 79
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1. Parameters to be Provided for Electromagnetic Flow Meter Selection

When selecting an electromagnetic flow meter, in order to ensure that the measurement requirements are met while considering accuracy, stability, and economy, a comprehensive evaluation and selection should be made based on the following parameters

1. Process Pipe Diameter and Flow Range Pipe Diameter: The nominal diameter of the pipeline (such as DN50, DN100, etc.) needs to be clearly defined to directly determine the diameter selection of the electromagnetic flow meter.

. If there is a change in diameter in the pipeline, it is necessary to confirm whether a flow meter needs to be installed through a reducer. Flow range: Normal flow rate, minimum flow rate, and maximum flow rate values should be provided to determine the flow measurement range ratio (such as 10:1 or higher), in order to avoid measurement errors or instrument damage caused by mismatched ranges. 2. Environmental working conditions and protection level: Select the protection level (such as IP6, IP67, etc.) according to the on-site environment (such as humidity, dust, water, etc.) to ensure the sealing of the instrument housing. Explosion proof requirements: If used in flammable and explosive places (such as chemical and oil and gas industries), it is necessary to confirm whether explosion-proof instruments are required and specify the explosion-proof level (such as ExdIICT4). Power supply voltage: The on-site power supply conditions (such as AC220V, DC24V, etc.) need to be provided to ensure that the instrument matches the power supply. Pipeline material: Metal pipelines need to be reliably grounded; Insulated pipelines (such as plastic and fiberglass) need to be grou
Technical requirements for electromagnetic flowmeter
nded through grounding rings or grounding electrodes to avoid interference. 3. Physical and chemical properties of the measured medium: Conductivity: Electromagnetic flowmeters are only suitable for liquids with conductivity ≥ 5 μ S/cm (such as water, acid-base solutions, pulp, etc.). If the conductivity of the medium is too low (such as pure water, organic solvents), other principle instruments need to be used instead. Temperature: The highest and lowest temperatures of the medium need to be provided to select temperature resistant lining materials (such as PTFE with a temperature resistance of ≤ 180 ℃, PFA with a temperature resistance of ≤ 200 ℃) and electrode materials (such as tantalum electrodes with high temperature corrosion resistance). Pressure: It is necessary to specify the maximum working pressure of the pipeline to ensure that the pressure bearing capacity of the flowmeter (such as PN1.6MPa, PN4.0MPa, etc.) meets the requirements. Solid particles and bubbles: If the medium contains solid particles (such as sand, gravel, mud), wear-resistant lining (such as ceramic lining) should be selected; If there are a large number of bubbles, it is necessary to optimize the installation position (such as vertical installation) or choose instruments that are resistant to bubble interference. Corrosivity: Choose corrosion-resistant electrodes (such as Hastelloy C-27

6, titanium electrodes) and lining materials (such as PTFE, PFA, rubber, etc.) based on the corrosiveness of the medium. 4. Structural form requirements: Integrated and split type: Integrated type: Sensor and converter integrated, suitable for situations with compact installation space and low environmental interference. Split type: The sensor and conve

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