The principle of the polarographic oxygen electrode was introduced,and a quick and accurate measuring instrument of dissolved oxygen(DO) was designed based on the low power consumption and high-precision MSP430 microcontroller.On the basis of analyzing the temperature characteristics of DO electrode,this paper designed a software temperature compensation strategy.Then,the function of automatic temperature compensation was implemented.The spot tests indicate that the measuring instrument has the characteristics of fast response,stability and strong noise resistances.It can meet the measuring precision in environmental protection and aquaculture.
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