The stand or fall of weighing sensor performance depends largely on the choice of materials. Weighing sensor material includes the following several parts: strain gauge material, elastomer material, patch adhesive material, sealant material, sealing material lead and lead materials.
Strain gauge and resistance element material
Strain gauge is induction part of weighing sensor, it will be the size of the external force into electrical signal output, is the most important part of the sensor, the commonly used strain gauge base material with polymer thin film materials, strain material usually for high purity constantan. The performance of the strain gauge not only related to substrate and constantan purity, also related to the manufacturing process. Improve the level of technology and improve the sensor performance is a very important aspect.
Weighing sensor elastomer is the function of external force, it must be under the same force, deformation, produced because of the strain gauge is pasted on the elastomer, the deformations of the elastomer is strain gauge deformation; At the same time it must be reset, disappeared in the external force, can be reset automatically. Elastomer material usually choose all kinds of metal, mainly of aluminum alloy, stainless steel, alloy steel and so on.
The patch adhesive materials
Patch adhesive is to make the strain gauge and elastomer firmly fixed together, make them produce deformation always consistent. Thus, patch adhesive is also an important part. At present, the use of call more patch adhesive is a two-component epoxy polymer adhesive series. Its performance and its purity, mixed mode, storage methods, cure time, cure time relationship is very big, watch it carefully before use according to the detailed introduction.
Early weighing sensor sealed with sealant, later, thanks to the development of manufacturing technology in welding technology can improve greatly the sensor’s stability and service life. Although now a lot of welding technique is adopted, but some still need to apply some important parts of the sealant. Sealant commonly used silica gel, silica gel has advantages of good stability, can be moistureproof, corrosion resistance, insulation performance is also very good.
Lead sealing and lead materials
Sensor output pin if it is not fixed, happen damage or loose, lead to unstable signal or no output. Current sensor output with the method of the connector, the connector of the material and fastening strength will also affect the output. Had better use the connector with sealant. Internal lead also needs to be fixed to prevent its moved around. Lead quality is also very important, its material performance from high to low order followed by silver, copper and aluminum wire. If around the high frequency signal and radio interference is serious, still need to use shielded cable; In the corrosive environment and flammable and explosive occasions need to adopt anti-corrosion flame retardant and explosion-proof cable, plus casing to protect.