The dissolved oxygen sensor is a sensing device for measuring the dissolved amount of oxygen in water. The continuous measurement of dissolved oxygen concentration in water plays several important roles in the field of water treatment:
1. Measurement and adjustment of oxygen in the activated sludge tank of a sewage treatment plant to achieve high efficiency in the biodegradation process.
2. Hydrological monitoring measures the oxygen content in rivers, lakes and oceans, indicating the quality of water.
3, water treatment: oxygen content measurement, such as the detection status in drinking water (oxygen enrichment / corrosion prevention, etc.).
4. Fish ponds: Oxygen is measured and adjusted to maintain optimal ecological and growth conditions.
The solubility of oxygen in water depends on the temperature, pressure and salts dissolved in the water. The dissolved oxygen analyzer sensor is composed of a gold electrode (cathode) and a silver electrode (anode) and a potassium chloride or potassium hydroxide electrolyte. The oxygen diffuses through the membrane into the electrolyte to form a measurement loop with the gold electrode and the silver electrode. When a polarization voltage of 0.6 to 0.8 V is applied to the electrode of the dissolved oxygen analyzer, oxygen diffuses through the membrane, the cathode releases electrons, and the anode receives electrons, generating an electric current. The whole reaction process is: anode Ag+Cl→AgCl+2e-cathode O2+2H2O+4e→4OH- According to Faraday's law: the current flowing through the electrode of the dissolved oxygen analyzer is proportional to the partial pressure of oxygen, and there is a linear relationship between the current and the oxygen concentration at the same temperature.
At present, there is no dissolving oxygen sensor with good quality in domestic brands. The better is the dissolved oxygen sensor produced by Japan FIGARO company - KDS-25B, the shallow dissolved oxygen sensor KDS-25B is a unique galvanic sensor. It was developed specifically for water quality control. The most notable feature of this dissolved oxygen sensor is its long service life and is not affected by CO2.
KDS-25B uses a special acidic electrolyte, the cathode is made of inert metal gold, the anode is made of metal lead, and oxygen diffuses through the fluororesin membrane to participate in the redox reaction to form an oxygen lead storage battery, which is then generated by an internal resistance. The current is converted into a voltage output. The generated current is proportional to the concentration of dissolved oxygen, strictly speaking, proportional to the partial pressure of oxygen (the higher the dissolved oxygen content, the more oxygen molecules that participate in the reaction through the fluororesin membrane), KDS-25B is environmental monitoring, One of the ideal sensors for water quality testing.
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