An intelligent electromagnetic flowmeter typically consists of a set of coils and two electrodes. The primary role of the coils is to generate a magnetic field that interacts with the conductive fluid passing through the pipe. As the conductive liquid moves, it acts like a conductor cutting through the magnetic field lines. According to Faraday's Law of Electromagnetic Induction, this motion induces an electromotive force (EMF) that is proportional to the flow velocity. The electrodes are responsible for detecting this induced EMF. To ensure accurate measurement, only the electrodes inside the measuring tube are in contact with the conductive fluid, while the rest of the inner surface is lined with an insulating material. This insulation prevents unwanted electrical short circuits and ensures the flowmeter operates correctly.
If the metal pipe itself is exposed to the fluid and also carries a magnetic field, it can create a short circuit between the conductive liquid and the pipe. This may cause the potential to be lost or distorted, leading to inaccurate readings. Therefore, the interior of the electromagnetic flowmeter is always lined with an insulating material. This article specifically discusses the characteristics and requirements of PTFE, a commonly used lining material.
Teflon, also known as polytetrafluoroethylene (PTFE), is considered the most chemically stable plastic material. Often referred to as the "Plastic King," it has excellent resistance to a wide range of chemicals and can operate under extreme temperature conditions. Teflon is unaffected by most acids, bases, solvents, and detergents, except for fluorine and its compounds. It can withstand hydrofluoric acid at concentrations from 0% to 100%, even when boiling, and can function at temperatures up to 200°C. Additionally, it is non-toxic, resistant to aging, and ideal for use in chemical and food industries where hygiene and safety are crucial.
Key performance features include high chemical resistance, including resistance to boiling hydrochloric acid, sulfuric acid, nitric acid, and aqua regia. It is also resistant to concentrated alkalis and various organic solvents. However, it is not suitable for environments involving chlorine trifluoride, high-temperature chlorine trifluoride, high-flow-rate liquid fluorine, or liquid oxygen due to their corrosive nature.
Maximum operating temperature: 150°C (special orders available).
Applications: Ideal for handling highly corrosive media such as concentrated acids and alkalis, as well as hygienic fluids.
Lining material: Polyperfluoroethylene propylene (F46), which offers similar properties to PTFE but with better wear resistance and improved resistance to negative pressure. Other features are largely comparable to F4.
Intelligent electromagnetic flowmeters are often integrated into DCS control systems and are typically constructed using stainless steel round bars for structural support.
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