| 摘要 |
PURPOSE:To enable the prevention of the tripping of a concentration measuring device, by detecting a drop in the reading of a total flow rate detector to prevent the clogging of a bypass piping with the control of an output of a preheater. CONSTITUTION:During the measurement of impurities of a sodium solution, reading of a total flow rate detector 6 is constant with an impurities concentration measuring device 15 and the surface temperature of a bypass piping 9 or the like is held at about 200 deg.C. But in case a clogging occurs in the bypass piping 9, an orifice 10 and the like, the total flow rate lowers. The drop is detected by reading of a flow rate detector 6 to control an output of a preheater 17 to a high position. As a result, impurities accumulated are dissolved with a rise in the temperature of the bypass piping 9 or the like and the reading of the flow rate detector 6 returns to the original position thereby enabling effective prevention of the tripping of the measuring device 15.
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