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本文针对液化气储罐分析了变密度情况下普通差压法测量液位所存在的问题，提出双差压计改进方法，从而克服了密度变化引起的误差，提高了液位测量的精度。
In this paper, the problems existing in the liquid level measurement of ordinary differential pressure method under the condition of variable density are analyzed in this paper, and the improved method of double differential pressure gauge is proposed to overcome the error caused by the density change and improve the accuracy of liquid level measurement.