Common materials for weighing sensors

The performance of weighing sensors largely depends on the selection of manufacturing materials. Load cell materials include the following parts: strain gauge materials, elastomer materials, patch adhesive materials, sealant materials, lead sealing materials and lead materials.
Resistance component material
The strain gauge is the sensing part of the weighing sensor, which converts the magnitude of external force into electrical output, and is the most important component of the sensor. The commonly used strain gauge base material is polymer film material, and the strain material is usually high-purity constantan. The performance of strain gauge is not only related to the purity of base material and constantan, but also related to the manufacturing process. Improving the level of process technology is also an important aspect of improving sensor performance.
Elastomer material
The function of the elastic body of the load cell is to transmit external force. It must have the same deformation when subjected to the same force, because the strain gauge is pasted on the elastic body, and the deformation of the elastic body is the deformation of the strain gauge; At the same time, it must also have resetting ability, which can automatically reset when external forces disappear. Elastomer materials are usually selected from various metals, mainly aluminum alloy, stainless steel, and alloy steel, etc.
Adhesive material
Patch adhesive is to firmly fix strain gauge and elastomer together, so that their deformation is always consistent. It can be seen that the patch adhesive is also an important component. At the beginning of the 21st century, the adhesive used in the patch called Duo was a two component polymer epoxy series adhesive. At the beginning of the 21st century, its performance is closely related to its purity, mixing method, storage time, curing method, curing time, etc. Before use, it is necessary to carefully read its detailed introduction.
Sealant material
Early weighing sensors were sealed with sealant, but later due to the development of manufacturing technology, welding technology can greatly improve the stability and service life of sensors. Although many welding techniques were used in the early 21st century, some important parts still need to be coated with sealant. Sealants generally use silicone, which has the advantages of good stability, moisture-proof, anti-corrosion, and excellent insulation performance.
Lead sealing
If the output lead of the sensor is not fixed, it may be damaged or loose, resulting in unstable signals or no output. At the beginning of the 21st century, sensors used connectors for output, and the material and tightening force of the connectors also had an impact on the output. It is best to use connectors in conjunction with sealant. Internal leads also need to be fixed to prevent them from moving around. The quality of the lead wire is also important, and its material properties are arranged in descending order from silver plated, copper wire, and aluminum wire. If there is severe interference from high-frequency signals and radio waves around, shielded cables should also be used; In corrosive environments and flammable and explosive environments, it is necessary to use anti-corrosion, flame-retardant, and explosion-proof cables with additional sleeves for protection.