Load cellsRegarded as the core component of electronic scales, its performance has an important impact on the accuracy and stability of electronic scales. When designing electronic scales, we are often faced with the problem of choosing the right sensor.
A load cell is a device that converts a mass signal into a measurable electrical signal output. When selecting a sensor, you first need to consider the actual working environment in which the sensor is located, because this is directly related to the normal operation, safety and service life of the sensor, and even affects the reliability and safety of the entire scale.
The range of the sensor should be selected based on a number of factors, such as the maximum weight of the scale, the number of sensors required, the weight of the scale, the maximum eccentric load and dynamic load that may be generated. In general, the closer the load of the sensor should be distributed to each sensor, the higher its weighing accuracy. However, in actual use, the load on the sensor not only comes from the object being weighed, but also includes factors such as the weight of the scale, the tare weight, the eccentric load and the vibration shock. Therefore, when selecting the range of a sensor, several factors must be considered to ensure the safety and longevity of the sensor.
As a rule of thumb, the operating range of a sensor is usually set between 30% and 70% of its range. However, for some scales with large impact force, such as dynamic rail scales, dynamic truck scales, steel scales, etc., we usually expand the range of the sensor and make its working range between 20% and 30% of the range, so as to increase the weighing reserve of the sensor and ensure the safety and life of the sensor. The choice of sensor type depends mainly on the type of weighing and the installation space to ensure proper installation and reliable weighing, taking into account the manufacturer's recommendations. Manufacturers usually stipulate the scope of application of the sensor according to the characteristics of the sensor, such as the force, performance index, installation form, structure type and elastomer material. For example, aluminum cantilever beam sensors are suitable for pricing scales, floor scales, portable scales, etc.;The steel cantilever beam sensor is suitable for hopper scales, electronic belt scales, sorting scales, etc.;Steel bridge sensor is suitable for rail scales, truck scales, crane scales, etc.;Column sensors are suitable for truck scales, dynamic rail scales, large tonnage hopper scales, etc.
Therefore, the sensor we selected should meet the requirements of the meter input sensitivity and match the selected meter to meet the accuracy requirements of the entire scale. An electronic scale is mainly composed of three parts: the scale body, the sensor and the instrument, when selecting the accuracy of the sensor, the accuracy of the sensor should be slightly higher than the theoretical calculation value, because the theoretical calculation is often limited by the objective conditions, such as the strength of the scale body is slightly poor, the instrument performance is poor, the harsh working environment of the scale and other factors directly affect the accuracy requirements of the scale. Therefore, we must raise the bar from all sides, while considering the economic benefits, to ensure that our goals are met.