1. Instrument features:
The oxygen analyzer has the characteristics of fast, accurate and high precision measurement. It uses advanced fuel cell sensors to measure oxygen content. Because the sensor is completely sealed, the sensor is maintenance-free. The service life is usually three to five years. It is an updated product of the old generation micro-oxygen meter. And combined with advanced single-chip technology, flow control, temperature compensation, pressure control system, it has a better man-machine operation platform and a wide range of performance.
The instrument adopts a unique overpressure protection device. When the gas flow increases suddenly, the overpressure protection acts and the passage of the gas into the sensor is cut off, thus well protecting the sensor from overpressure damage. At the same time, the needle valve can seal the sensor under unused conditions during the design of the instrument, prevent the sensor from being consumed in the air, and can purge the sampling line to clean the sampling line. It plays an important role in rapid and massive analysis operations.
Second, the working principle of the instrument:
The oxygen analyzer uses a completely sealed fuel cell oxygen sensor is one of the most advanced oxygen measurement methods in the world. The fuel cell oxygen sensor is composed of a highly active oxygen electrode and a lead electrode, and is immersed in the KOH solution. Oxygen is reduced to hydroxide ions at the cathode, and lead is oxidized at the anode.
O2 + 2H2O + 4e? 4OH?
2Pb + 4OH ?? 2Pb (OH) 2 + 4e
The KOH solution is separated from the outside by a layer of polymer film, and the sample gas does not directly enter the sensor, so the solution and the lead electrode do not need to be cleaned or replaced regularly. The oxygen molecules in the sample gas diffuse through the polymer film to the oxygen electrode for electrochemical reaction. The current generated in the electrochemical reaction depends on the number of oxygen molecules diffused into the oxygen electrode, and the diffusion rate of oxygen is proportional to the sample gas. Oxygen content, in this way, the sensor output signal size is only related to the oxygen content in the sample gas, and not to the total amount of gas passing through the sensor. Through the connection of external circuits, the charge transfer in the reaction, that is, the magnitude of the current, is directly proportional to the oxygen participating in the reaction.
Using this method for oxygen measurement, it is not affected by the reducing gas in the measured gas, eliminating many sample gas processing systems. It is faster than the old-fashioned "gold-net-lead" primary battery to measure oxygen and does not require a long blow-out process. The "gold-net-lead" primary battery sample gas directly enters the solution, resulting in a large amount of instrument maintenance and fuel The sample gas of the battery method does not directly enter the solution, and the sensor can work very stably and reliably for a long time. In fact, fuel cell oxygen sensors are completely maintenance-free.
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Shijiazhuang AoFeiTe Medical Devices Co., Ltd. , https://www.aofit.com