| 摘要 |
PURPOSE:To improve an accuracy in monitoring a concentration, and further improve a reliability in monitoring a concentration by a method wherein a concentration of absorption liquid in an absorption type freezer is directly and actually measured more than that of the prior art. CONSTITUTION:An electrode part 22 (including an active electrode, reference electrode and a thermocouple or the like) is arranged at a proper location in an absorption liquid circulating passage in an absorption type freezer. The active electrode may generate an oxidization and reducing reaction together with substances contained in the absorption liquid. A potential difference between the active electrode and the reference electrode is calculated by a potentiometer 23 so as to calculate an oxidization and reducing potential. The potential is corrected in reference to a temperature by a converting device 24 on the basis of a measured temperature value of the thermocouple. A solution liquid pump 8a and a refrigerant pump 8b are controlled by a control device 25 in reference to the measured concentration of the absorption liquid and then a diluting operation at the time of stopping operation is controlled. |
