Which Dissolved Oxygen Analyzer is better

Many customers often face many choices when buying a dissolved oxygen analyzer. They don’t know which is the best dissolved oxygen analyzer? In fact, first of all, you need to know that iron needs to be hard. Before choosing, you may wish to analyze the dissolved oxygen first. Take a look at the instrument and understand its product principles, applications, parameter selection, etc. Only when you have a general understanding of the products you need, can you be more sure to distinguish, which dissolved oxygen analyzer is better? 　　 First of all, the principle. Dissolved oxygen refers to the amount of oxygen dissolved in the water, usually denoted as DO, It is expressed in milligrams of oxygen per liter of water (in mg/L or ppm). Some organic compounds undergo biodegradation under the action of aerobic bacteria, which consumes dissolved oxygen in the water. If the dissolved oxygen cannot be replenished in time, the anaerobic bacteria in the water body will multiply quickly, and the organic matter will turn the water body black due to corruption. smell. The amount of dissolved oxygen in the water is an index to measure the self-purification ability of the water body. The dissolved oxygen in the water is consumed, and it takes a short time to return to the initial state, indicating that the water body has strong self-purification ability, or that the water body pollution is not serious. Otherwise, it means that the water body is seriously polluted, the self-purification ability is weak, or even the self-purification ability is lost. It is closely related to the partial pressure of oxygen in the air, atmospheric pressure, water temperature and water quality. In fact, the dissolved oxygen analyzers currently on the market can be roughly divided into membrane method and fluorescence method according to the principle. The 　　 film method is also called polarography and constant pressure method, which uses electrochemical principles. A semi-permeable membrane is used to separate the platinum cathode, silver anode, and electrolyte from the outside world. Generally, the cathode is almost in direct contact with this film. Oxygen diffuses through the membrane at a ratio proportional to its partial pressure. The greater the oxygen partial pressure, the more oxygen will pass through the membrane. When the dissolved oxygen continuously penetrates the membrane and penetrates into the cavity, it is reduced on the cathode to generate a current. This current is directly proportional to the dissolved oxygen concentration. The meter part undergoes amplifying processing to convert the measured current into a concentration unit. There is a built-in light source in the fluorescence probe, which emits blue light and illuminates the fluorescent layer. The fluorescent substance emits red light after being excited. Because oxygen molecules can take away energy (quenching effect), the time and intensity of the red light excited are related to the oxygen molecules. The concentration is inversely proportional. By measuring the phase difference between the excited red light and the reference light and comparing it with the internal calibration value, the concentration of oxygen molecules can be calculated. No oxygen is consumed during the measurement, the data is stable, the performance is reliable, and there is no interference.　　 After talking about the principles of two major types of dissolved oxygen analyzers, let's talk about common applications.　　1, aquaculture: 　　 to ensure the respiratory demand of aquatic products, real-time monitoring of oxygen content, automatic alarm, automatic oxygenation and other functions.　　2, natural waters water quality monitoring　　 detects the degree of pollution of the water area, self-purification ability, and prevents biological pollution such as eutrophication of the water body.　　 Therefore, the most prominent feature of the HART protocol is that the digital communication is compatible with the analog signal 4-20mA, and the transmitted signal is superimposed on the 4-20mA analog signal with a modulated sinusoidal signal.　　3, sewage treatment, control indicators 　　 anaerobic tank, aerobic tank, aeration tank and other indicators are used to control the water treatment effect.　　4. Control the corrosion of the metal material of industrial water supply pipes　　 Generally, ppb (ug/L) range sensors are used to control the pipes to achieve zero oxygen and prevent rust. They are often used in power plants and boiler equipment.　　 As for the parameter selection of the dissolved oxygen meter, the most important point is of course the range of the dissolved oxygen meter. The most commonly used range is 0-20mg/L, which can basically meet most of the working conditions. The second is precision. The precision of the membrane method can reach 1.5%, and the precision of the fluorescence method can reach 3%. The rest, just like other instruments, just confirm the power supply, count the output signal, temperature and so on.　　 In addition, the membrane method and the fluorescence method, in comparison, because the principle of the fluorescence method is more advanced, the measurement is more stable and the maintenance is relatively simple, but the price is much more expensive. With the membrane method, although the initial purchase cost is relatively low, the subsequent maintenance is more troublesome. So which one is better or worse depends on your actual situation.　　 The above points are just a few points you can refer to when choosing a dissolved oxygen analyzer. So, don’t worry about which dissolved oxygen analyzer is better in the future. As long as the manufacturer understands the principle and has more application cases, it can explain the difference between the main membrane method and fluorescence method in the market. Manufacturers are more powerful.
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