| 摘要 |
PROBLEM TO BE SOLVED: To make performable stable measurement at an optional depth by measuring liquid pressure difference between two points at different depths in a liquid to be measured, taking in a depth difference dimension and a gravitational acceleration value signal, and finding an average liquid density value at the two points from these. SOLUTION: Pressure detectors 1, 4 are respectively suspended from the liquid level of a liquid to be measured by signal cables 3, 6 while holding a vertical directional interval between respective pressure receiving surfaces 2, 5, that is, a difference (h) of a detecting liquid level constant. Pressure value signals P1, P2 from the pressure detectors 1, 4 are inputted to a subtraction computing element 11 through the signal cables 3, 6 to arithmetically operate and output a liquid pressure difference signalΔP. A density computing element 14 receives the liquid pressure difference signalΔP, a gravitational acceleration signal G set by a gravitational acceleration setting unit 12 and a liquid level difference value signal (h) set by a detecting liquid level difference setting unit 13 to arithmetically operate and output a liquid density value signalρ. A liquid density indicator 15 displays the density of a liquid to be measured thereby, to be transmitted to the other receiving measuring gauge and a medium according to the necessity of recording, display and control.
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