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The probe and measurement circuit for the liquid level measurement of ultra low temperature cylinder was designed. Liquid Nature Gas( LNG) sensor is a coaxial capacitance sensor which was used with the material of 304 stainless steel. Teflon was used as an insulating material to isolate the stainless steel sleeve and to realize the coaxial positioning. The circuit was designed based on 7555 timer and STM32 chip, combining the embedded technology to convert the capacitance of the sensor to the pulse signal output. the height and fuel allowance were calculated based on relative capacity method. The experimental results shows that the measuring circuit can converted the capacitance signal of the sensor to pulse signals reliably and stably, the expected measurement accuracy is less than 0.6 % .

The liquid level measurement of ultra low temperature cylinder based on the relative capacity method