What does the sensitivity of a load cell mean?

1、 What does the sensitivity of a weighing sensor mean?

In the technical specifications of the weighing sensor manual, we can see the various parameters and technical requirements of this type of sensor, and sensitivity is one of the parameters, in mV/V.

　　Load CellThe sensitivity of is the output voltage under nominal load, which is a reference for designing amplification circuits. When the dimensions of the output and input of the sensor are the same, sensitivity can be understood as amplification. Improving sensitivity can result in higher measurement accuracy. But the higher the sensitivity, the narrower the measurement range, and the worse the stability.
　

2、 Sensitivity calculation method for weighing sensors

The ratio of the output variation Uout (such as 10mV) of the sensor under certain power supply conditions (such as 5VDC) when the load reaches the rated full scale (such as 10kg) to the power supply voltage: S=Uout/Uin=10mV/5V=2mV/V

Generally speaking, high sensitivity requires low requirements for the measurement circuit, but when the sensitivity is too high, it also generally requires a wide measurement range for the measurement circuit. It is ideal to choose the appropriate sensitivity so that the sensor can output a zero to full amplitude signal within the measurement range of concern. In this way, the measurement range of the measurement circuit can be fully utilized, and the measurement accuracy can be maximized.

3、 Notes on sensitivity

Multiple weighing sensors are often used in scales, and each weighing sensor needs to have the same sensitivity to be used simultaneously. If the sensitivity is not the same, it can lead to inaccurate measurement. Placing an item in different positions on the same scale will display different weights. When it is necessary to replace a damaged sensor, it is also necessary to find a sensor with the same sensitivity and range.