LIQUID LEVEL MEASUREMENT DEVICE, LIQUID LEVEL MEASUREMENT EVALUATION METHOD

PROBLEM TO BE SOLVED: To provide a liquid level measurement technique which allows quick and successful detection when an abnormality occurs in the structure of an analog circuit base while curtailing cost and hardware materials.SOLUTION: A determination part 30 of a liquid level measurement device has: an input part 33 for inputting each of output signals Vof a first thermocouple groups as an analog value as it is; a gas-liquid identification part 37 for outputting each first identification signal S[k=0 to n] identifying at which phase, gas phase or liquid phase, a detection point 15 of a first thermocouple is positioned; and a comparison part 52 for inputting each second identification signal Sderived from a second thermocouple group, comparing it with a first identification signal Swhose height position corresponds to that of the second identification signal, and outputting a comparison signal Windicating whether both the signals coincide with each other.SELECTED DRAWING: Figure 2 【課題】コストやハードウェア物量を抑制し、アナログ回路ベースの構成に異常が発生した場合、速やかに確実に検知することができる液面レベル計測技術を提供する。【解決手段】液面レベル計測装置の判定部３０が、第１熱電対の群の出力信号ＶAｋの各々をアナログ量のまま入力する入力部３３と、第１熱電対の検出点１５が気相又は液相のいずれに位置するか識別した第１識別信号ＳAｋ[ｋ＝０〜ｎ]を出力する気液識別部３７と、第２熱電対の群に由来する第２識別信号ＳBｋを入力し高さ位置が対応する第１識別信号ＳAｋと照合し両者が一致するか否かを示す照合信号ＷAｋを出力する照合部５２とから構成されている。【選択図】 図２