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The sensor has three parts 1, 2, and 3 from top to bottom that divides it into two chambers labeled C sub 1 and C sub 2. The bottom part is labeled, conducting plate, the middle part is labeled, flexible metallic membrane, and the top part is labeled, conducting plate. The fluid is poured from the top. The bottom chamber contains oil and the top chamber is empty. A downward arrow in the top chamber is labeled, P and an upward arrow in the bottom chamber is labeled, P sub 0. The top chamber is labeled, C sub 1 and the bottom chamber is labeled, d sub 2.