Level of the liquid which utilizes the strain gauge type load electrolysis cell/the volume measurement system and its measuring method

摘要

PROBLEM TO BE SOLVED: To highly accurately measure a minute change of liquid level/liquid amount by outputting the weight of a buoyance weight changing in accordance with the liquid level as a voltage change, and converting an amplified voltage signal to a digital signal. ;SOLUTION: A buoyance weight 10 is shaped like a pipe having a sealed internal space. An average density of the buoyance weight 10 is set to be nearly equal to the density of a liquid 5 to be measured. The buoyance weight 10 is coupled to a strain gauge type load cell (LDC) 25 thereabove via a string 20. An output of the LDC 25 is connected via an amplifier (AMP) 30 to an A/D converter (ADC) 35 converting analog signals into digital signals. An output of this ADC 35 is connected to an input of a central processing apparatus (CPU) 40 which processes detected signals, calculates a change amount of a liquid level/liquid amount and controls a display device (DIS) 45, a communications interface (SDCI) 50 and the whole system.;COPYRIGHT: (C)1999,JPO