What is an Electromagnetic Flow Meter?
I. Overview of Electromagnetic Flow Meters
An electromagnetic flow meter is an instrument that uses Faraday's law of electromagnetic induction to measure the volumetric flow rate of conductive liquids. With its features of no flow-obstructing parts, high measurement accuracy, and wide range of applications, it has been widely used in industrial process control and water treatment fields.
II. Functional Characteristics of Electromagnetic Flow Meters
Electromagnetic flow meters can measure the flow rate of various conductive liquids, including water, sewage, acids, alkalis, salt solutions, and slurries containing fibers or solid particles. Due to its unique measurement principle, the electromagnetic flow meter is unaffected by changes in fluid density, viscosity, temperature, pressure, and conductivity (within a certain range), resulting in high measurement accuracy and good stability.
III. Installation of Electromagnetic Flow Meters
1. External Environment Requirements
Avoid installation in locations with drastic temperature changes, high-temperature radiation, corrosive gases, strong magnetic fields, and strong vibrations. Also, keep away from rain, standing water, and direct sunlight. If installation in such environments is unavoidable, appropriate insulation, ventilation, moisture-proof, sun-proof, and vibration-damping measures must be implemented. If pipe vibration is significant, fixed supports should be installed on both sides of the flow meter. Sufficient space should be reserved around the flow meter for installation and maintenance.
2. Installation Method Requirements
Prioritize installation on the lower part of horizontal pipes or in vertically upward pipe sections, avoiding the highest point of the pipe and vertically downward pipe sections; install in the rising section of the pipe or at the lower end of open discharge pipes. If the pipe drop exceeds 5m, an air release valve should be installed downstream of the sensor; control valves and shut-off valves should be installed downstream of the sensor, and strictly prohibited from being installed upstream. The sensor should not be installed at the pump inlet or outlet, but rather at the pump outlet end.
3. Straight Pipe Section Requirements
The length of the inlet straight pipe section should be ≥10×DN, and the length of the outlet straight pipe section should be ≥5×DN.
4. Grounding Requirements
The sensor must be properly grounded, with a grounding resistance of <10Ω; if the metal pipe is well-grounded, no additional grounding device is required.
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