CONCENTRATION METER WITH AUTOMATIC CALIBRATING FUNCTION

摘要

PURPOSE:To estimate measurement precision and grasp the life of a detector by measure concentrations of a sample and a material for calibration at a period determined by a period determination part, and comparing the comparison result between measured values before and after calibration with a control value. CONSTITUTION:Signals corresponding to the concentrations of the sample and material for calibration are sent from a detector 1 to an arithmetic part 3 through a program controller 2 according to the period determined by the period determination part 7 to perform calibration according to the period of the controller 2 and also calculate the concentrations. A comparison part 4 compares the measured values of the concentrations before and after the calibration with each other and the comparison value is further compared with the control value from a control part 5 by a comparison part 6 according to the period of the period determination part 7. At this time, when the output of the comparison part 4 exceed the control value, the calibration period is made long and when not, the calibration period is set long. Consequently, the measurement precision is estimated and the life of the detector 1 is grasped.