An intelligent system for liquid level measurement of railway tankers is designed.The system applies the capacitive differential pressure sensors to obtain liquid height of the tankers

it uses thermistor as a temperature probe to provide temperature compensation for the system

sensors output data is processed by computer after C/U conversion circuits and A/D conversion

it can show the liquid height in tankers.The experiment results show the resolution of measuring system is 1mm and the error of liquid level is ±5 mm.The system has higher accuracy for liquid level measurements

and the system can realize the automated measurement for liguid level of railway tankers.