A mixer and a circulating type photometric testing automatic analyzer are used for testing specific components of solutions or studying on
chemical reaction dynamics. The mixer comprises a liquid inlet tube, a mixer body, an upper liquid outlet
pipe communicated with the inner cavity of the mixer body and a lower liquid outlet
pipe communicated with the inner cavity of the mixer body. One end of the liquid inlet
pipe is vertically inserted into the inner cavity from bottom to top and is communicated with the inner cavity, the upper liquid outlet pipe is connected with the top portion of the mixer body, and the lower liquid outlet pipe is connected with the bottom of the mixer body. The automatic analyzer further comprises a mixer, an automatic injection valve, a
reagent selector value, a three-way valve, a
reagent pump, a
water sample pump, a multi-channel switching valve, a
reagent quantitative loop, a spectrophotometric
detector and a
control circuit. By the adoption of the automatic analyzer, the photometric testing is not interfered by air bubbles in a flow path,
automation degree is high, the automatic sample feeding and the on-line mixing are added, no reagents need to be added
repeatability, the
utilization rate of reagents is improved efficiently, operation is flexible, the
degree of reaction can be controlled by adjusting the mixing time, and the sensitivity can be adjusted to meet the measurement requirements of target objects with different concentrations.