What is the material of the load cell sensors?

Elastomeric material

The elastic body material of the force sensor is generally made of metal, and most of the available materials are aluminum alloy, alloy steel and stainless steel. The alloy material not only has rigidity to ensure uniform deformation and deformation recovery, but also has good weather resistance and corrosion resistance. The main requirement of elastomers is to be able to accurately transmit force information and maintain uniformity of deformation and complete resetting under the same force.

Strain gauge and resistance element materials

The composition of the resistance strain gauge is complex and it is a composite manufacturing product. The combination of the base material of the strain gauge and the strain copper is ever-changing. According to its strain requirements, there are currently about a thousand products. Generally, the base material is a polymer film material, and the strain material is high-purity constantan. The constantan on the substrate is optically processed to etch resistive grid wires with different induced deformations. Therefore, the quality of the resistance strain gauge is not only related to the substrate material and the purity of the composite metal, but also related to factors such as the composite process, etching technology and process, etching chemical material, and post-treatment process and material.

SMD adhesive material

The adhesive for resistance strain gauge patch mainly adopts two-component polymer epoxy series adhesive. The performance of polymer chemical products is closely related to the physical and chemical indicators of each component, such as purity, molecular chain structure and size , Storage time, component ratio, molecular modification, mixing method, mixing and curing time, curing time, curing temperature, additives and percentages.

Sealant material

In the initial stage of load cell with insufficient welding technology and equipment, special silicone rubber sealant series are used. Silicone rubber has long-term chemical stability. Therefore, it has excellent properties such as corrosion resistance, moisture resistance, aging resistance, and insulation. It has long been the first choice for all sealants.

The wire material of the load cell

The wire is still a part of the load cell. The metal material of the load cell wire, due to the use of household electrical wires, has a personal experience of the quality difference. After all, the wire is the path for bridge power supply, signal output, and long-line excitation voltage compensation. The silver-plated wire is definitely better than the copper wire, and the copper wire is definitely better than the aluminum wire. Its role is self-evident.

With the increasing interference of various high-frequency and radio waves, the excellent shielding of the load cell is also an important method to protect the stability of the signal. In addition, environmental erosion, pest infestation, fire prevention and flame retardancy also require the material of the sensor protection layer to be anti-corrosive, insect-proof, fire-proof and explosion-proof, and even need to adopt methods such as armor protection and casing protection.

Wire sealing material and method

Each component of the load cell will affect the final technical performance of the sensor. Some load cells only use simple fixing methods to avoid the movement of the sensor wires and damage the electronic circuit of the sensor. Some load cells with a short conduction distance even only Rely on glue seal to fix. However, for a load cell with a larger volume and a heavier weight, if there is no proper wire fixing or sealing method, the load cell is the most likely bottleneck for failure. Especially when the sealing head is installed to fix the wire, the material and tightening force of the fastener will also affect the final technical performance of the load cell. Observers found that there are very few installations using fasteners and sealing adhesives, which can avoid the residual stress caused by the fastening force, and will not cause leakage due to insufficient fastening force.

This article is from HONG DA (HK) ELECTRONICS which offer electronic components, semiconductors, antennas, capacitors, connectors, diodes, transistors, IC,resistors. For more product information, please go to the website to get it.