Based on the principle of automatic control and potential titration, an automatic analyzer was developed. The working process of the instrument is introduced. With the application of threshold value analysis and correlative analysis, the titration termination can be determined accurately. The CPU in the main board of this instrument is Intel 8032. The application of preamplifier module made the instrument work in the high precision. The photoelectrical switch serves as the stopper of the upper and lower point of the titration tube. Besides the analyzing function, this instrument can also be used to measure the value of conductivity, potential, pH and current.
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