| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure the concentration change in such mixed substance as the solid content of target liquid containing bubbles by measuring the concentration of the liquid to be measured in a plurality of different pressure states and correcting the influence of bubbles using the plurality of measurement values. SOLUTION: An automatic gate valve 22 is opened by the control signal of a controller 33, a pressure-reducing mechanism 31 is operated, a switching valve 32 is set to the side of the pressure-reducing mechanism 31, a piston 24 is withdrawn from a delivery position, liquid to be measured flowing to detector piping 21 is sampled into a measurement chamber cylinder 23, and the automatic gate valve 22 is closed. A pressurization pressure source 30 is operated, the switching valve 32 is switched to the side of the pressurization pressure source 30, a piston 24 is pressed down, the inside of the measurement chamber cylinder 23 is gradually pressurized and at the same time pressure is measured by a pressure detector 26, and the signal is inputted to the controller 33. On the other hand, a phase measurement system according to microwaves is operated, pressurization is made and at the same time a phase is measured, concentration is obtained using a calibration curve by a concentration computing element 34, the influence of bubbles is corrected by a bubble influence correction computing element 35, and the concentration of the solid content of liquid to be measured is outputted.
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