The sensitivity of the liquid level sensor refers to the ratio of the change of the output of the liquid level sensor under steady-state operation to the change Δx of the input quantity. It is the slope of the output of an input characteristic curve. If there is a linear relationship between the output and the input of the level sensor, the sensitivity S is a constant. Otherwise, it will change with the input. The dimension of sensitivity is the ratio of the dimensions of the output and the input. For example, if a displacement level sensor changes output voltage by 200mV when the displacement changes by 1mm, its sensitivity should be expressed as 200mV/mm. When the output and input of the level sensor have the same dimension, the sensitivity can be understood as the magnification. Improve the sensitivity, can get higher measurement accuracy. However, the higher the sensitivity, the narrower the measurement range and the worse the stability.
The resolution of the liquid level sensor refers to the ability of the liquid level sensor to sense the smallest change that can be measured. That is, if the input changes slowly from a non-zero value. When the input change value does not exceed a certain value, the output of the liquid level sensor will not change, that is, the change of the input level of the liquid level sensor cannot be distinguished. Only when the input changes by more than the resolution does the output change. Usually, the resolution of each point of the liquid level sensor in the full-scale range is not the same. Therefore, the maximum value of the input amount that can cause a step change in the output is commonly used as an index for measuring the resolution.
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