High accuracy pressure type liquid level measurement system capable of measuring density

This paper presents a new type of a level sensor using the absolute pressure sensors. This measurement system consists of a liquid storage tank and a sensor module to measure the liquid level. Also the module has a sensing part, a signal amplification part and the power supply part. The implemented system was tested using water with 3 times from 0 L ∼ 11 L by the increase of 0.5 L interval. And the density of the liquid is measured as the additional pressure sensor is installed on the upper site. As a result, the sensitivity of the level sensor is 370.9 mV/L. And density measurement is consistent with the calculation. And the nonlinearity is within ±0.5 %.