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What are the differences between different electromagnetic flowmeters?

2020-08-13View Original

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“Differences between “split-type” and “integral-type” electromagnetic flowmeters: Electromagnetic flowmeters can be classified into three types based on their design: 1. Integral-type electromagnetic flowmeters: The converter is directly connected to the sensor, making them suitable for on-site display. 2. Split-type electromagnetic flowmeters: The converter and sensor are connected via signal wires; they are appropriate for use in environments where measurement conditions are poor and remote display is required. 3. Insertion-type electromagnetic flowmeters: They are installed by making an opening in the pipeline without the need to cut the pipe itself; they are suitable for measuring large-diameter pipes, are easy to transport, offer good cost-performance ratios, and are suitable for applications where high measurement accuracy is not required. The working principles and characteristics of these two types of flowmeters are the same, and the selection criteria are also identical. The only difference is that in integral-type flowmeters, the sensor and converter are combined together for on-site display, while in split-type flowmeters, the sensor and converter are connected via signal cables, allowing the converter to be placed anywhere suitable for remote display. Of course, generally, split-type units are more heat-resistant than integrated ones, and they are also slightly more expensive. The Chengfeng Instrument split-type electromagnetic flowmeter is primarily used for measuring the flow rate of fluids in industrial pipelines, including various media such as gases, liquids, and vapors. It is characterized by low pressure loss, a wide measurement range, and high accuracy; when measuring volumetric flow rate under operating conditions, it is hardly affected by parameters such as fluid density, pressure, temperature, and viscosity. Instructions for installing electromagnetic flowmeters: Installation guidelines: 1. Selection of installation location To ensure the reliable and stable operation of the sensor, the following requirements should be taken into account when selecting the installation location: (1) Try to avoid ferromagnetic objects as well as equipment with strong magnetic fields (such as large motors, large transformers, etc.), so as to prevent the magnetic field from affecting the sensor’s operating magnetic field and flow signal. (2) It should be installed in a dry and well-ventilated area as much as possible; it is not suitable to be installed in damp places where water tends to accumulate. (3) Exposure to sunlight and rain should be avoided as much as possible, as well as conditions where the ambient temperature is above 60°C and the relative humidity is above 95%. (4) Choose a location that is easy to maintain and convenient for access. (5) The flow meter should be installed at the rear end of the water pump; it must not be installed on the suction side ; The valve should be installed on the downstream side of the flow. 2. Installation requirements: For accurate measurements, the following requirements should be considered when selecting a location on the pipe: (1) The sensor can be installed on straight pipes as well as on horizontal or inclined pipes, provided that the line connecting the two electrodes remains horizontal. (2) The medium should flow fully within the pipe at the installation location, to avoid incomplete filling of the pipe and gas adhering to the electrodes. (3) For liquid-solid two-phase fluids, vertical installation is preferred to ensure even wear of the sensor lining and extend its service life. (4) When the medium in the installation location is not sufficient, the pipeline at the rear end of the flow meter can be raised to ensure a full pipeline; it is strictly prohibited to install the flow meter at the highest point of the pipeline or at the outlet. ​

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