Material Selection for Magnetic Level Indicator in Hydrofluoric Acid Level Measurement Magnetic level indicator is mainly used for liquid level measurement. Because measured liquids in industrial field usually are flammable, explosive, and corrosive, material for magnetic level indicator should be selected according to the properties of the measured liquid to ensure longer service life and reliability of the instrument. For example, hydrofluoric acid is highly corrosive. It is essential to select proper material for the chamber and display panel (especially the transparent front cover) of the magnetic level indicator to avoid corrosion. 1. Common materials for magnetic level indicators Generally, materials for chamber and display panel of a magnetic level indicator are selected according to the properties of the measured medium. Shenzhen Jiwei Automations Ltd.

Common materials used for chamber are stainless steel 304, stainless steel 316L, stainless steel 304/316L lined with F4 or F46 fluorine tube and plastic PP. Among them, stainless steel 304 and 316L are more popular. If the measured medium could have chemical reaction with the compositions in stainless steel to cause corrosion, fluorine lined stainless steel or plastic PP should be selected as a proper material for the chamber. If the measured medium is at normal temperature and under normal pressure, plastic PP will be a suitable choice. If the measured medium is at abnormal temperature and under...

Patent - Transparent Panel Connect Structure of Jiwei Magnetic Level Indicator 2. Comparison table for corrosion resistance of different materials to various strong corrosive liquids In industrial applications, common strong corrosive liquids are: aqua regia, sulfuric acid, hydrochloric acid, hydrofluoric acid, etc. Understanding corrosive resistance of various Shenzhen Jiwei Automations Ltd.

JIUI6I -itZj&ztlft- materials when they are immersed into these strong corrosive liquids could help us select the correct material for the magnetic level indicator applied in level measurement of hydrofluoric acid. Following table is a comparison for corrosion resistance of different materials to various strong corrosive liquids. Corrosion resistance comparison table for different materials Note: strong (+) moderate (/) poor (O) unknown (--) As we can see from the table above, the corrosion resistance of acrylic and PTFE is better overall. They are ideal materials for measuring highly corrosive...

According to the properties of hydrofluoric acid, plastic PP is a good choice for the magnetic liquid indicator used in level measurement of hydrofluoric acid. If the hydrofluoric acid is under good ventilation and certain process pressure, fluorine lined 316L is a better choice. Although aluminum alloy display panel with glass front cover can be used for most of liquids, glass cannot be used as the front cover if the instrument is used for hydrofluoric acid. Hydrofluoric acid is more corrosive to some metals, glass and material containing silicon, because hydrofluoric acid dissolves glass (main...

Fig.1 Corroded blurry front cover onsite Manufacturers should fully communicate with users to select proper magnetic level indicator made of the most suitable material for real application working conditions. Jiwei Automations has always paid great attention on this. Our staff communicates with each user patiently to realize the properties of the measured medium and understand working conditions and help the customer select the best suitable magnetic level indicator. Furthermore, we have overcome several technical problems in real applications of magnetic level indicator and hold multiple invention...

Shenzhen Jiwei Automations Ltd.