Using polarographic dissolved oxygen electrode and NEC microcontroller as core processor

which has property of low power consumption

high stability

a new type of high-precision dissolved oxygen sensor is designed.The principle of the sensor

the performance parameters of NEC MCU

hardware architecture and circuit analysis

software design are introduced.Aiming at shortcoming of polarographic oxygen electrode that the intensification time is too long

a practical solution is proposed

the measurement time is greatly reduced.18-bit A/D converter and high-precision instrumentation op-amp are used

the measurement precision is improved.