When use, electromagnetic flowmeter should avoid what kind of environment? Release date: 2019 04 - 25 viewed: zero

Electromagnetic flowmeter is 50 ~ 60 s of the 20th century has been developed rapidly with the development of electronic technology and a new type of flow measurement instrument. Electromagnetic flowmeter is a kind of using the electromagnetic induction principle, according to the conductive fluid by external magnetic field induction electromotive force to measure instrument of conductive fluid flow. 1. Due to strong magnetic field during the installation process generally attention away from the strong magnetic field, so almost no practical experience of the influence of strong magnetic field. 2. Strong electromagnetic wave electromagnetic flowmeter should meet the requirements of electromagnetic compatibility. It shall, in accordance with the provisions of the radiation electromagnetic field work environment, will not result in instrument performance degradation or work in the abnormal circumstances. When separate electromagnetic flowmeter have big common-mode interference at the scene, based on the analysis of the cause of the problem, strong radio waves should be considered as a possible interference sources. This example is a rare error in the process of debugging. 3. Pipeline stray current electromagnetic flowmeter right after grounding, can avoid most of the effects of stray current in the pipe. Sometimes, according to the regulation, the use of thick wire bridge flow sensor and improve ground, but it's still under the influence of stray current, need to take other measures. 4. Ground potential changes in the earth potential changes will affect the flow measurement. For example, other equipment grounding line voltage drop will cause the change of the electromagnetic flowmeter grounding potential. If a large common-mode interference, measurement will be affected. 5. Water immersion of water supply and drainage industry using electromagnetic flowmeter flow sensor is often placed in the instrument well below the horizon, so often immersed in the failed to timely discharge of rain water, even submerged in water for a long time. Even if the shell protection grade is IP67 ( Dustproof short-term immersion level) Or IP68 ( Dust continuous immersion level) The accidents often happen, because of the junction box cover gasket or cable entry seal ring is not tight, ring is not installed, or ring and the outer diameter of the cable does not match.