Product Category of Dissolved Oxygen Electrodes

Dissolved Oxygen Electrode: Dissolved Oxygen (DO) is the abbreviation of Dissolved Oxygen, which is a parameter that characterizes the concentration of oxygen in aqueous solution. . Classification of dissolved oxygen electrodes There are many ways to measure DO: such as chemical Winkler method, electrode method, mass spectrometer and so on. The electrode method is mainly introduced here. The dissolved oxygen electrode was first invented by Clark (1956). It is an amperometric electrode covered by a gas-permeable film. DO electrodes can be divided into two categories: Galvanic type and Polargrafic type. Dissolved oxygen electrodes can be used to measure and monitor processes where oxygen levels can affect reaction rates, process efficiency or the environment: such as aquaculture, biological reactions, environmental testing (lakes, streams, oceans), water/wastewater treatment, wine production. T401ppm dissolved oxygen electrode has high stability and reliability, can be used in harsh environments, and requires less maintenance. The dissolved oxygen electrode dissolved oxygen rlcctrodc is an electrode for measuring the concentration of dissolved oxygen in a liquid. Now commonly used is the film-coated oxygen electrode. The cathode of the electrode is a noble metal such as silver or platinum, the anode is an active metal such as tin or lead, and the acetate buffer is the electrolyte. The reaction of the two poles is: cathode O2 }- 2Hzf l}4e--- }40H one, the noble metal of the cathode does not react, and only plays the role of transferring electrons; the anode 2Pb }2Ph2 ten ten}C', the anode must release electrons, so Consumable: the electrode head is covered with a semipermeable membrane, and the oxygen in the liquid passes through the semipermeable membrane to the cathode, and electrons flow between the two poles to generate current. The greater the oxygen concentration, the stronger the current, and the dissolved oxygen concentration becomes an electrical signal, which can be displayed on a display or recorder after amplification. Polarization of the dissolved oxygen electrode 1. Polarization method: connect the cable and the transmitter and The electrodes are connected, and the electrodes start to polarize when the transmitter is powered on. 2. The probe needs to be polarized for the following rotten conditions: the electrode is used for the first time, polarized for more than 6 hours; when the membrane or electrolyte is replaced, it is polarized for more than 6 hours; the transmitter is powered off, or the electrode is disconnected from the cable . 3. Polarization voltage: When measuring the medium with high dissolved oxygen (biochemical fermentation, wastewater treatment), the polarization voltage is - 6 7 5 mV. Measuring low dissolved oxygen wax leak information medium (< 5 0 0 p p b ), the polarization voltage is -500mV.