The load cell usually consists of a spring element on which a strain gauge is placed, the spring element is usually made of steel or aluminum. This means that it is strong, but not very elastic. As the name suggests, "spring element" means that the steel deforms slightly under load, but then returns to its initial position, being elastic for every load. These small changes are obtained by means of strain gauges, whose deformations are interpreted by analytical electronics to determine the weight. So how to choose a load cell?
1. Capacity: In addition to the measured load to be measured, the initial load, impact coefficient and load eccentricity coefficient should be considered. Therefore, the capacity of the selected load cell should be at least 10% higher than the load to be measured.
2. Dynamic range: In the practical application of electronic weighing system, several load cells are often used at the same time, so the load cell is generally designed to work at about 80%~85% of the rated load, which leaves a safety margin and ensures its accuracy. If you choose a very high capacity sensor, you may not be able to measure very small loads very accurately. As a rule of thumb, the load to be measured should be 10% to 90% of the rated capacity.
3. Shape: The shape of the load cell depends mainly on its application and installation arrangement. For example, the S-type is suitable for applications where the load is applied at both ends, while the diaphragm type is suitable for applications where the load is applied at one end only.
4. Selection of sealing status of load cell: The use of the environment is relatively harsh, often need to choose the sealing of the load cell, to protect the sensor from the influence of the external environment. Cited electronic load cell, such as humidity, dust, corrosive gases, etc., so as to ensure the accuracy and stability of the measurement.
In addition, attention should be paid to other specifications, such as rated output, temperature range, error and protection level.
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