Material and selection of float level gauge

Float level gauges also work based on the basic floating body law. Floating balls with different densities float up and down with the liquid surface, which drives the related connectors to change, thereby causing the mechanical or electronic related variables of the measuring element to change, thereby obtaining the liquid level change data. The float level gauge is divided into various installation methods: top-mounted, bottom-mounted, side-mounted, etc. The side-mounted level gauge is the smallest in terms of range, but because it is installed on the tank side, it can be used to measure the interface liquid It is used more in raw material tanks or reaction furnaces in production lines. Its advantages are: high detection resolution, safe performance, good long-term use, easy application, convenient installation and maintenance, and can be widely used in the detection and monitoring of material position, interface position and density in the production of related industries, especially in In the petrochemical field, the application scope of the float level gauge is very wide, and its use greatly improves the safety of production. The disadvantage is that most of the traditional float level gauges adopt a mechanical structure, and the liquid level change is directly reflected by the dial, which is more intuitive, but the detection accuracy is small, and the anti-fluctuation ability is small. Parts stick or adhere to impurities which can affect the measurement results. The research status of float level gauge The float level gauge is a liquid level measuring device with a long history. In general, the float level gauge can be divided into three structures: buoyancy device, connection conversion device and display device. The buoyancy device corresponds to the floating ball in the liquid level gauge. According to different installation methods, the shape of the floating ball is also different, mainly spherical, square and cylindrical. Since the development of the floating ball level gauge, a variety of floating ball constituent materials have been derived. Generally, they can be divided into four categories according to their application environment: (1) In the general acid-base corrosive low-temperature environment, the use of PP foaming And other PP series materials mainly. The chemical name of PP plastic is polypropylene, which is a crystalline polymer. It is the lightest material in commonly used plastics, and its density is only O. 9l/cm3, it has the advantages of light weight, good toughness, good chemical resistance, etc. It is the lowest cost float material in actual use of float level gauge, so it is widely used. Its shortcomings are insufficient rigidity, insufficient weather resistance, and easy to produce 'copper damage'. Due to the chemical properties of its materials, it is prone to aging, which makes the float brittle, deformed, and not resistant to high temperature. (2) It is a stainless steel material suitable for mild and moderate acid-base corrosive liquids at high temperatures. The commonly used stainless steel materials are 304 (material 18-8: alloy made of chromium-containing crl8% and nickel-Ni8%), 316 (material 18.10: alloy made of chromium-containing Crl8% and nickel-NilO%), 316L ( The carbon content is lower than that of 316, about 0.03%). In terms of the pros and cons of the float level gauge material, 316L is the best, because during welding, 316L carbon is not easy to precipitate and combine with chromium to form chromium carbide, which can reduce the corrosion phenomenon of the welded part; 316 is the second, because compared to 304 and 316 add a certain amount of aluminum in the smelting process, which greatly improves their corrosion resistance; 304 is relatively common and widely used. (3) NBR material, the use environment of the float level gauge is diesel, gasoline and other oil-permeable oil liquids. NBR: The full name of 11itrile-butadiene rubber is nitrile-butadiene rubber or nitrile rubber. It is a kind of rubber foam material. This type of material is mainly used as a sealing material in the market, and as a float material, there are few manufacturers. (4) PVDF and spray tetrafluoroethylene: the main use environment is high acid-base corrosive liquids at low temperature and high temperature. PVDF: chemical name polyvinylidene fluoride, white or transparent solid, density is 1.17～1.79∥cm3, melting point is 172℃, heat distortion temperature is 112～145℃, long-term use temperature is . 40～150℃, it is a non-combustible material. PVDF resin combines the main characteristics of fluororesin and general resin. In addition to good chemical resistance, high temperature resistance, oxidation resistance, weather resistance, radiation resistance, it also has piezoelectricity, dielectricity, pyroelectricity It is widely used in the storage and transportation of high-purity chemicals in the semiconductor industry. Spraying tetrafluoride means that the float level gauge is sprayed on the surface of the substrate to achieve strong acid, strong alkali resistance, negative pressure resistance of 0.1 MPa, positive pressure of 72kg, and high and low temperature resistance. 193 degrees to +260 degrees, anti-stick, wear-resistant, anti-static and other properties. The sprayed fluororesin materials are: F40, F30, FEP, PFA, which are generally used in relatively harsh liquid measurement environments. In addition to the float level gauge, the externally mounted level gauge is also a commonly used level instrument. It can realize non-contact measurement of airtight containers without opening the container to be measured, and can accurately measure the liquid level of various toxic substances, strong acids, strong alkalis and various pure liquids in high temperature and high pressure airtight containers. Related product links: Externally mounted liquid level gauge 31.html
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