Atmega128-based Dual-channel Intelligent Online Dissolved Oxygen Analysis

In recent years, along with science technical develop continuously, more and more persons start to be aware of to monitor the necessity and the importance of the dissolved oxygen in the water. In the units, such as big and medium-sized power plant, the water processing factory, oil-field and environmental protection...etc. particularly, in order to insure the fluid matter, guarantee that the equipments circulates normally over a long period of time, must monitor and control the dissolved oxygen in the water used strictly.This thesis is introductive to Dual Dissolved Oxygen Analysis Instrument according to the on-line type of the intelligence of a machine of ATmega128.Absorb the advantage of the domestic and international of the same kind product, with the common use electricity chemistry analytical method in the analysis chemistry as the theories foundation and the leading thought, combine modern micro-electronics technique but the on-line type intelligence of the developments analysis appearance. In the chemistry aspect, we used analytical method -- the polarography in electrochemistry for foundation, adopt the experiment method of imitate the power station water road to build the chemistry terrace that the analytical appearance experiment need. Take tiny controller of ATmega128 as the control centre at the electronics technique aspect, with the mold piece turns the electric circuit design method for foundation, carried out the diagraph of the high accuracy, high stability of the appearance request, the overall design carries out the intelligence to turn the degree high, operate the simple convenience etc. characteristics.Substantially completed the design mission currently, measure scope is:0.0-20.0 PPM, accuracy is:0.1 PPB, apply the temperature scope:0-60℃. in the laboratory continuously work a month is very stable. has been imitated to adjusted to try and adjust to try on the scene, pass with the nation standard and the ratio that import the appearance to, that watch has already matched the nation standard, measure the accuracy to have already near to import the appearance. can be the on-line type appearance to used for continuous examination that the fluid matter dissolves the oxygen value.