The excitation voltage of the sensor simulator comes from the bridge voltage of the weighing display instrument, which is a passive signal generator. Weighing sensor is an important category of mechanical sensors, which is also the most widely used, and there are many forms. In general, the construction of weighing sensors mainly includes elastomers, strain gauges, seals and so on. For sensor manufacturers, it generally specifies the force of the sensor, performance indicators, installation form, structural form, elastomer material and so on. When designing a good weighing sensor, the hysteresis performance of the product must be fully taken into account. Through the above analysis, combined with the specific situation, the size of hysteresis can be significantly reduced. Several of them interact to affect the performance of the sensor, the following analysis of their respective roles:
The choice of the form of the weighing sensor mainly depends on the type of weighing and installation space, to ensure that the installation is appropriate, and the Sedeli sensor is safe and reliable; The sensor simulator can not only set and calibrate the weighing display instrument in the laboratory, but also find and find the fault cause in the field in time, so as to quickly eliminate the fault, it is an essential electronic truck scale detection and maintenance equipment. The simulator is similar to a DC standard voltage source and can provide analog voltage signals in various weighing ranges to the weighing display instrument. Load cell simulator is made according to the working principle of resistance strain gauge load cell. It can simulate various loading states of resistance strain gauge load cell.
The metal material used as the elastomer of the weighing sensor, due to the complex organizational structure of the said force sensor, when subjected to external force, there will be micro-strain between the tiny grains, and after the external force disappears, the micro-strain will disappear, but whether it can be completely restored to the original state without force, is different due to the metal material of the elastomer. If the curve of the loading force and the curve of the unloading force do not coincide, the greater the difference, the greater the hysteresis.
The strain gauge of a load cell is mainly composed of a sensitive grid, a base, a covering layer and a lead. It converts the strain of the elastomer into a change in resistance value through the resistance strain effect of the sensitive gate. If the material itself has hysteresis, the strain gauge also has hysteresis. This is also a factor that must be considered when choosing a load cell.
After the elastomer and strain gauge are composed, the sensor also needs to be sealed with sealant, mainly for fixed lines and seals to prevent the influence of the external environment on the performance of the sensor. When a small force is applied to the elastomer, the elastomer deformation is small, and the sealant thickness affects the deformation that occurs.
