Three-parameter intelligent compensation and correction electrochemical online dissolved oxygen sensor

Abstract

The invention discloses a three-parameter intelligent compensation and correction electrochemical online dissolved oxygen sensor that comprises a dissolved oxygen electrode, a conductivity sensor, anatmospheric pressure sensor, a temperature electrode, a detected water sample flow cell, a sensor bracket and a detection circuit unit, wherein the dissolved oxygen electrode comprises a shell of thesensor, an oxygen permeation membrane, a membrane cover, a gold electrode, a silver electrode, a platinum electrode, a liquid reaction electrolyte, an electrode base and insulated wires; the dissolvedoxygen electrode, the conductivity sensor, the atmospheric pressure sensor and the temperature electrode are respectively connected to the detection circuit unit through insulated wires for signal processing; the detection circuit unit comprises a polarization voltage circuit, a dissolved oxygen signal detection circuit, a conductivity, atmospheric pressure and temperature compensation circuit, aserial port communication circuit and the like. The conductivity, the atmospheric pressure and the temperature influencing the dissolved oxygen detection concentration are compensated and calibratedat the same time, the detection accuracy is greatly improved, the response speed is high, the precision is high, the service life is long, and the stability is good.

Description

technical field [0001] The invention relates to the field of dissolved oxygen content detection, in particular to a three-parameter intelligent compensation and correction electrochemical online dissolved oxygen sensor. Background technique [0002] Dissolved oxygen refers to molecular oxygen dissolved in liquid water. It is a key indicator for water pollution and water quality assessment, and a key indicator for water quality testing, sewage treatment, food fermentation, aquatic products, and clinical diagnosis. Generally, the dissolved oxygen concentration in drinking water should not be lower than 6mg / L. When the concentration of dissolved oxygen in the ecosystem is lower than 4mg / L, fish will suffocate and die due to hypoxia. In the field of food fermentation, controlling the dissolved oxygen concentration is an important consideration to ensure the growth of microorganisms. In the field of clinical diagnosis, the metabolic state of cells and tissues can be understood ...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing electrochemical dissolved oxygen electrodes have the following technical problems: (1) The calibration of the sensor before detection requires manual operation and cannot be calibrated by itself

(2) The detection process is greatly affected by environmental parameters, and it is impossible to perform real-time compensation and calibration for changes in environmental parameters

(3) Poor anti-interference ability and inaccurate detection data

(4) The unreasonable design of the working electrode structure leads to poor response speed, precision and stability of the sensor

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