| 摘要 |
PURPOSE:To facilitate accurate measurement for a long period, by providing an automatic calibration part keeping the sensitivity of an oxygen detection machine constant by using air-saturated water as a standard solution and controlling this part, a sampling part, a reaction part and an oxygen concentration measuring part by providing a sequence circuit part. CONSTITUTION:A measuring apparatus is provided with a sequence circuit part X to control the function of each part of a sampling part A, a reaction part B, an oxygen concentration measuring part C and an automatic calibration part D in the concentration measurement of H2O2 using in the food or fiber industry. The temperature in a constant-temperature water bath 12 of the part B is kept at a constant temperature by a warm water adjusting circuit 20 and air is supplied from an air pump 13 to water in a reaction receptacle 11 and the water is saturated with the air. Saturated water is used for automatic correction of sensitivity of an oxygen detector 21 connected with an preamplifier 22. Adjustment of zero point and sapn of the detector 21 is carried out by an automatic calibration circuit 31 applying a servomotor and an output is kept constant. Next, the water in the reactor 11 is thrown away and after putting a sample in the reaction and carrying out aeration, an H2O2 decomposition agent is added from a tank 14 to detect dissolved oxygen. The result is displayed on an indicator 24. Repetition of these operations is controlled by the part X. |
