Electromagnetic pipeline flowmeter | Requirements for straight pipe section of electromagnetic flowmeter

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Which is a good liquid flow controller?

2. Does the electromagnetic flowmeter have to measure the entire tube?

The electromagnetic flowmeter must measure the entire tube, which is a basic requirement for ensuring measurement accuracy.. 1. The measurement principle requires that the electromagnetic flowmeter operates based on Faradays law of electromagnetic induction, which requires the fluid to completely fill the pipeline and continuously pass through the electrode in order to accurately cut the magnetic induction line and generate induced electromotive force. Discontent with the tube can lead to: - significantly low measurement values (reduced measurement cross-sectional area) - severe fluctuations in output signals (liquid level shaking) - complete failure (electrode exposed to air) 2 The national standard GB/T 18659-2018 for measuring the flow rate of conductive liquids in closed pipelines and using electromagnetic force flow meters specifies that the installation position should ensure a full pipe: - The pipeline layout should avoid the accumulation of bubbles at the highest point - When installing horizontally, the electrode axis should be parallel to the horizon - When installing vertically, the fluid must flow from bottom to top - Valves/elbows and other flow blocking components should maintain a straight pipe section of 10D in front and 5D behind (D is the pipe diameter) Special working condition response plan: Technical measures need to be taken for scenarios where pipes may not be fully filled: - Install drainage bends or U-shaped pipe sections to maintain full pipe status - Use non full pipe electromagnetic flow meters (special structural design, high price) - Adopt liquid level detec

tion+automatic compensation system (requiring secondary instrument support) 4 Dangerous operation warning: It is strictly prohibited to operate the standard electromagnetic flowmeter for a long time under the condition of incomplete tube, which may cause: - electrode dry burning damage (when the medium is high-temperature liquid) - lining material overheating deformation (PTFE lining temperature limit of 150 ℃) - measurement error exceeding 20% (some working conditions can reach more than 50%). The latest industry practice shows that non full tube electromagnetic flowmeters using multi electrode array technology and adaptive signal processing algorithms have gradually been commercialized (such as the E+H Promag W series), but their purchase as pure sensitive bridge pads is about 2-3 times that of conventional models, and the minimum liquid level requirement for electrode coverage by liquid still needs to be ensured.

3. Requirements for the straight pipe section of the electromagnetic flowmeter

Installation requirements for the straight pipe section of the electromagnetic flowmeter Core conclusion: 5D-10D is required upstream, 3D-5D is required downstream, and it needs to be lengthened when there are flow blocking components.

. 1. The length of the upstream straight pipe section requires the fluid to be sufficiently stable before entering the electromagnetic flowmeter, so the upstream needs to maintain a straight pipe section 5-10 times the diameter of the pipeline (5D-10D). If the installation environment is complicated: - When there is a single 90 ° elbow or valve, it is recommended to extend the straight pipe section to 10D; - When there are two different flat pointed elbows (such as a three-dimension

Electromagnetic pipeline flowmeter | Requirements for straight pipe section of electromagnetic flowmeter

Which is a good liquid flow controller?

2. Does the electromagnetic flowmeter have to measure the entire tube?

3. Requirements for the straight pipe section of the electromagnetic flowmeter

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