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Sensitivity and Resolution of Level Transducer

Aug 07, 2023

The level transducer sensitivity refers to the ratio of the amount change Δy of level sensor in the steady state operation to the input quantity change Δx. It is the slope of the output-input characteristic curve. If the output of level transducer is linear with the input, the sensitivity S is a constant. Otherwise, it will change as the amount of input changes.

The dimension of sensitivity is the ratio of the dimensions of the output and the input. If a displacement level transducer has a change in output voltage of 200 mV when the displacement changes by 1 mm, the sensitivity should be expressed as 200 mV/mm. When the output of level transducer and the dimension of the input amount are the same, the sensitivity can be understood as a magnification. Increase the sensitivity and get higher measurement accuracy. However, the higher the sensitivity, the narrower the measurement range and the worse the stability.

The resolution of the level transducer is the ability of level sensor to sense the smallest change being measured. Meanwhile, if the input varies slowly from some non-zero value. When the input change value does not exceed a certain value, the output of the liquid level transducer does not change, that is, the change of the input level of the level transmitter is not distinguishable. Their output will only change if the input changes more than the resolution. Usually, the resolution of the liquid level sensor at each point in the full-scale range is not the same, so the maximum change value of the input quantity that can make the step change of the output in the full-scale range is used as an index for measuring the resolution.

The sensitivity and resolution of level transducer determine the accuracy and stability of level transducer and play a vital role in the development of the sensor.


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