The insertion-type magnetic flow meter is a high-precision and widely applicable flow measurement instrument. With the continuous development of modern industry, traditional pipe-section electromagnetic flowmeters have encountered certain application limitations in measuring flow in flotation slurry systems, mainly in the following two aspects:
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Although traditional pipe-section electromagnetic flowmeters offer high accuracy, they come at a high manufacturing cost. In large-diameter pipelines used in flotation slurry systems, such high precision is unnecessary, and the larger pipe diameter further increases the cost.
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Traditional pipe-section electromagnetic flowmeters are flanged to the pipeline, and in some coal preparation plants, the flotation slurry pipelines are quite old. Installation often requires cutting and welding flanges onto the pipe, which can cause significant damage. Additionally, traditional pipe-section electromagnetic flowmeters can only be installed or removed when the pipe is free of fluid, which impacts coal production and increases maintenance costs.
The insertion-type magnetic flow meter has evolved from the traditional pipe-section type, with the same design principles. However, due to the characteristics of its sensor structure, it offers significant advantages when measuring flow in large-diameter pipelines. It has a lower manufacturing cost, and its sealed structure allows for online installation without cutting the pipe, making it easy to disassemble and maintain. It is particularly advantageous for measuring flow in larger pipelines carrying flotation slurry.
The insertion-type magnetic flow meter is suitable for pipelines with diameters from DN15 to DN2200, with a measurement accuracy of ±1%. After calibration, the error at each point is within 1%. As long as installation conditions are met, the instrument’s accuracy is guaranteed.
The minimum measurable flow velocity is 0.1 m/s (even lower), with a minimum conductivity of ≥20μS/cm.
It has a wide flow range, up to 100:1.
The flowmeter is resistant to corrosion and wear. The sensor only contacts the medium through the liner and electrodes, and choosing appropriate electrode and liner materials ensures durability.
The sensor can be made as a submersible type (IP68), making it ideal for installation on buried pipelines in factories.
Insertion-type magnetic flow meter selection:
Provide the properties of the measured liquid (mainly conductivity), flow range, temperature, pressure, and pipe diameter of the medium being measured.
Select between a standard integrated or split type, or an explosion-proof integrated or split type, depending on the installation location.
Choose the sensor material based on the degree of medium corrosion. Calculate the minimum flow velocity measurable by the insertion-type electromagnetic flow meter (low flow velocity affects accuracy) to determine if the pipe diameter should be reduced to increase flow speed.
Determine the insertion depth and installation accessories based on the pipe diameter.
The insertion-type magnetic flow meter is easy to install, simplifies the renovation of old pipelines, and provides the required measurement accuracy for the flotation automatic dosing system. It ensures the accurate operation of the flotation dosing system, helping production technicians analyze and adjust the reagent dosing coefficient (K). This results in stable coal quality, increased production efficiency, and precise reagent dosing. Additionally, it saves reagent consumption, reduces system complexity, and decreases labor costs.
