Abstract:

       We designed a dissolved oxygen sensor with the principle of polarographic dissolved oxygen and PIC18F2520 as a core controller. We also addressed the compensation algorithm of a DO sensor in temperature, pressure and salinity. Experiments show that a DO sensor has such advantages of simple structure and stable performance, temperature accuracy of ±0.3 ℃ and DO accuracy of ±0.07 mg/L.

Key words: polarography, dissolved oxygen sensor, PIC18F2520