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The Load Cell Materials
The performance of the weighing sensor depends largely on the choice of the manufacturing material. The weighing sensor material comprises the following parts: Strain gage material, elastomer material, patch binder material, sealant material, lead sealing material and lead material.
Strain gage and resistor element materials
The Strain Gage is the sensing part of the weighing sensor, it converts the external force into electrical output, is the most important component of the sensor, and the common strain base material uses the polymer thin film materials, the strain material is usually high purity Kang copper. The performance of the strain Gage is not only related to the purity of the base material and Kang Cu, but also to the manufacturing process. Improving the technology level is also an important aspect to improve the performance of the sensor.
The function of the weighing sensor elastomer is to transfer the external force, it must have the same force in the same time, the same as deformation, because the strain plate is pasted on the elastomer, the deformation of the elastomer is the strain of the deformation of the film, but also it has to be reset, in the absence of external forces can be automatically reset. Elastomer materials usually choose all kinds of metal, mainly aluminum alloy, stainless steel and alloy steel and so on.
The patch binder is the strain gage and the elastomer firmly fixed together, causes them to produce the deformation to be consistent forever. This shows that the patch binder is also an important part. At the beginning of 21st century, the use of a lot of adhesive tape is a two-component polymer epoxy adhesive series. At the beginning of 21st century, its performance and its own purity, mixing mode, storage time, curing mode, curing time and other relations are very large, in the use of carefully read its detailed introduction.
Early weighing sensor seals are used sealant, later due to the development of manufacturing technology, welding technology can improve the stability and service life of the maximum sensor. Although many of the early 21st century used the welding technology, but some important parts also need to apply some sealant. Sealants are generally used silica gel, silicone has a good stability advantages, can be moisture-proof, anti-corrosion, insulation performance is very good.
Lead sealing and lead material
If the sensor output lead is not fixed, it will be damaged or loose, resulting in unstable signal or no output. At the beginning of 21st century, the sensor output used connectors, the material and fastening strength of connectors will also affect the output. The best use of connectors with sealants. Internal leads also need to be fixed to prevent them from moving around. The quality of the lead is also important, and its material properties are from high to low in order of silver, copper and aluminum wire. If the surrounding high-frequency signal, radio interference serious, but also the use of shielded cable; in corrosive environment and flammable and explosive occasions need to use anti-corrosion flame retardant and explosion-proof cable, plus casing for protection.
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