Electromagnetic flowmeter can't bear the cause of the negative pressure and solution

The characteristics of the electromagnetic flowmeter: measure from the fluid density, viscosity, temperature, pressure and the influence of the conductivity changes; Application field widely. Often used in the pharmaceutical industry, food industry, biological engineering, etc have health requirements. But at the scene of the user in the process of practical application, a number of factors will directly affect the instrument performance, and can't meet the user's expectations. Below small make up is the solution of the electromagnetic flowmeter can't bear negative pressure to do detailed analysis. Electromagnetic flowmeter can't bear negative pressure solution RZ - LDE electromagnetic flowmeter lining is indeed a stick, because of the electromagnetic flowmeter is based on the principle of electromagnetic induction to work. Electromagnetic flowmeter generally has a set of coil and two electrodes, the role of the coil is an electric field is put in the fluid, the flow of conducting liquid is equivalent to a conductor, according to Faraday's law of electromagnetic induction when conductor cutting lines of magnetic force produces a corresponding electromotive force is proportional to the speed, the effect of electrode is measuring the induced electromotive force, so the measuring tube only electrode is connected to the conductive liquid, the other part is the lining, must guarantee the insulation, electromagnetic flowmeter can work normally. If there is a magnetic field the metal pipe is in contact with the liquid phase, electromagnetic flowmeter and the short circuit between the conductive liquid and metal, there will be a conductive, potential will cause electromagnetic flowmeter can't measure the electric potential, so the interior of the electromagnetic flowmeter are lining, is to separate the electrode and the measured medium with electromagnetic wall contact. This is the key to guarantee the normal work of the electromagnetic flowmeter can conditions of when measuring medium has certain corrosion, ptfe we will use the memory materials [ Industrial electrical network - cnelc] 。 But the four fluorine PVC material of electromagnetic flowmeter can't under negative pressure. Produce negative pressure would be easy to make the lining drop, the phenomenon such as cracks, so that the water and the contact of electromagnetic flowmeter can't use. So when the pipe produced under the condition of negative pressure is pulled down from a wall electromagnetic liner, the liner cannot afford the damage causes the flowmeter can't use, so usually requires measurement of negative pressure pipe does not happen. Solution to the problem, there are two: 1, change the original exhaust valve to check valve ( Check valve) , there was a slight negative pressure pipeline, non-return valve automatically open, from the inhalation of air in the atmosphere, thereby, to ensure safety. 2, with belt type frame memory, the disadvantage is that increasing investment. ( Instrument science and technology in this paper by embellish release, if you encounter any problems in the process of using the instrument, can call our domestic sales service hotline: 0517 - 86917118, we have * * personnel unriddling for you)

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