strain gauge and load cell

In structural monitoring and water and soil pressure measurements, strain gauges and load cells play different but complementary roles. The core value of strain gauges lies in their high sensitivity and ability to resolve small strains. They can be attached to the surface of steel structures or concrete to directly obtain local stress changes. The load cell is a packaged component that can output a standard force signal and is more suitable for automated monitoring systems that require long-term stable operation. A common misunderstanding is that "the accuracy of strain gauges is not as good as that of load cells." In fact, the accuracy of both depends on the conditioning circuit and calibration process. The resistive strain gauges provided by Kingmach have polyimide and phenolic epoxy base materials and are suitable for different temperature ranges; while the load cells we assemble, such as anchor cable dynamometers and earth pressure cells, all use full-bridge compensation internally, and the nonlinearity is usually controlled within 0.5% FS. In geotechnical sites, installation conditions often influence the final results more than the sensors themselves. For example, the bonding process of strain gauges must strictly deal with surface cleaning, adhesive layer thickness and curing time; the load cells must pay attention to their alignment to avoid errors caused by eccentric loading. Kingmach will provide detailed installation instructions for after-sales support and send engineers to the site if necessary. In addition, for users with special needs, we can adjust the range, size or output signal type, such as changing the standard 0~10V output to 4~20mA loop power supply. In practice, the choice of strain gauge or load cell is not about who is better, but depends on the project's tolerance for installation convenience, signal stability and subsequent maintenance.