The composition of the load cell

The load cell is a device that converts the quality signal into a measurable electrical signal output. The load cell is generally composed of sensitive components, transforming components, measuring components, and auxiliary power supplies.

1. Sensitive elements are elements that directly sense the measured (quality) and output other quantities that have a definite relationship with the measured. For example, the elastic body of the resistance strain type load cell converts the mass of the measured object into deformation; the elastic body of the capacitive load cell converts the measured mass into displacement.

2. The conversion element is also called the sensor element, which converts the output of the sensitive element into a signal that is convenient for measurement. For example, the resistance strain gauge (or resistance strain gauge) of the resistance strain type load cell converts the deformation of the elastic body into the change of resistance; the capacitor of the capacitive load cell converts the displacement of the elastic body into the change of the capacitance . Sometimes some components have both the functions of sensitive components and transforming components. Such as the piezoelectric material of the voltage type load cell, under the action of external load, it outputs electricity while deforming.

3. The measuring element transforms the output of the transforming element into an electrical signal, which provides convenience for further transmission, processing, display, recording or control. Such as the bridge circuit in the resistance strain load cell, the charge preamplifier of the piezoelectric load cell.

4. The auxiliary power supply provides energy for the electrical signal output of the sensor. Generally, load cells need external power supply to work. Therefore, as a product, the power supply requirements must be marked, but it is not a component of the load cell.

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