A load cell is a device that converts a quality signal into a measurable electrical signal output. The load cell is generally composed of a sensitive component, a conversion component, a measuring component, and an auxiliary power source.
1. A sensitive component is a component that directly senses the measured (mass) and outputs a different amount that is determined to be measured. For example, the elastic body of a resistance strain type load cell converts the mass of the measured object into a deformation; the elastic body of the capacitive load cell converts the measured mass into a displacement.
2. The transform component, also called the sensing component, converts the output of the sensitive component into a signal that is easy to measure. For example, a resistance strain gauge of a resistance strain type load cell (or a strain gauge) converts the deformation of the elastomer into a change in the amount of resistance; the capacitor of the capacitive load cell converts the displacement of the elastomer into a change in capacitance. . Sometimes some components have both the functions of both sensitive and transforming components. For example, a piezoelectric material of a voltage load cell outputs electric power while being deformed by an external load.
3. The measuring component converts the output of the transforming component into an electrical signal for convenience in further transmission, processing, display, recording or control. Such as the bridge circuit in the resistance strain type 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, the load cell needs an external power supply to work. Therefore, as a product, the requirements for power supply must be indicated, but not as part of the load cell.
Weighing sensor, weighing module, weight transmitter, weighing control instrument, weighing application system
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