| 摘要 |
PURPOSE:To enable the safe measurement with high accuracy of the density variation in vertical direction and liquid level by moving vertically the measuring probe for liquid density from the bottom face inside a tank upto around the ceiling and by detecting the liquid level from the maximum position of the density variation factor. CONSTITUTION:A density meter incorporating probe 4 is provided inside a tank 1 containing the LNG of L-L liquid level. The probe 4 is suspended via the guide cable 3 penetrating the ceiling face of the tank 1 and moved with being connected to the signal cable 5 being rotatively driven with the cable 3 as a guide on the vertical line of the anchor 2 fixed on the bottom face of the tank 1. The cable 5 is wound via a sheave 8, the terminal is connected to an arithmetic unit 13 via a slip ring 15 and the position of the probe 4 is calculated as the distance from the bottom face with calculating the output signal of the rotary detector 12 of the sheave 8. Due to the resonance frequency being largely varied in the cases of the probe being in the liquid of the inside of the tank 1 and out of the liquid, the liquid level inside the tank is detected from the maximum position of the density variation factors. |
