First, the instrument features:
The Oxygen Analyzer features fast, accurate, and highly accurate measurements. It uses an advanced fuel cell sensor to measure oxygen levels. Since the sensor is completely sealed, the sensor is maintenance-free. Usually the service life can be up to three to five years. It is an updated product of the old generation micro-oxygen meter. And with advanced MCU technology, flow control, temperature compensation, pressure control system want to combine, so that it has a better man-machine operating platform and a wide range of performance.
The instrument uses a unique over-pressure protection device. When the gas flow suddenly increases, the over-pressure protection action and the passage of gas into the sensor are cut off, thus protecting the sensor from over-voltage damage. At the same time, because the instrument is designed, the needle valve can seal the sensor under the condition of no use, prevent the sensor from being consumed in the air and can purify the injection pipeline to achieve the purpose of cleaning the injection pipeline. It plays an important role in the fast, massive analysis of the workforce.
Second, the working principle of the instrument:
The oxygen analyzer uses a completely sealed fuel cell oxygen sensor, which is one of the advanced oxygen measurement methods in the world. The fuel cell oxygen sensor is composed of a highly active oxygen electrode and a lead electrode, immersed in a solution of KOH. At the cathode oxygen is reduced to hydroxide ions, while at the anode lead is oxidized.
O2+2H2O+4e?4OH?
2Pb+4OH??2Pb(OH)2+4e
The KOH solution is separated from the outside by a polymer film, and the sample gas does not directly enter the sensor, so the solution and the lead electrode do not need to be periodically cleaned or replaced. The oxygen molecules in the sample gas are diffused into the oxygen electrode through the polymer film for electrochemical reaction. The current generated in the electrochemical reaction is determined by the number of oxygen molecules diffused to the oxygen electrode, and the diffusion rate of oxygen is proportional to that in the sample gas. The oxygen content, such that the sensor output signal size is only related to the oxygen content of the sample gas, regardless of the total amount of gas passing through the sensor. Through the connection of the external circuit, the charge transfer in the reaction, that is, the magnitude of the current is proportional to the oxygen participating in the reaction.
The oxygen measurement by this method can be free from the influence of the reducing gas in the gas to be tested, and many sample gas treatment systems are eliminated. It is faster than the old-fashioned "Golden Net-Lead" primary battery, and does not require a long boot-off process. The "Golden-Lead" primary battery sample gas directly enters the solution, resulting in a large amount of instrument maintenance. The battery sample gas does not directly enter the solution, and the sensor can work very stably and reliably for a long time. In fact, the fuel cell oxygen sensor is completely maintenance free.
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