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Use and Precautions of Oxygen Analyzer

The oxygen analyzer is an oxygen sensor composed of zirconia solid electrolyte, and the signal change is an intelligent online analysis instrument composed of a new microprocessor as the core. Mainly used for air separation, automatic analysis of oxygen content in chemical processes; semiconductor, magnetic material production; float glass, cement building materials industry; automatic analysis of oxygen content in various industrial furnaces, heat treatment processes, and scientific research on electronic components, biopharmaceuticals, etc.

Features of the oxygen analyzer

The oxygen analyzer has the characteristics of fast, accurate and high precision measurement. It uses advanced fuel pool sensors to measure the oxygen content. Because the sensor is completely sealed, it is maintenance-free. Typical service life is three to five years. It is an updated product of the old generation microoximeter. And it wants to combine with advanced single-chip microcomputer technology, flow control, temperature compensation, and pressure control system, 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 rate suddenly increases, the over-pressure protection acts, and the passage of the gas into the sensor is cut off, thereby protecting the sensor from over-pressure damage. At the same time, the needle valve of the instrument is designed to seal the sensor when it is not in use, preventing the sensor from being consumed in the air and purging the sampling line to achieve the purpose of cleaning the sampling line. It plays an important role in fast, large-scale analysis operations.

Precautions for using the oxygen analyzer

How to use the oxygen analyzer safely and effectively

When performing oxygen content analysis, especially trace oxygen analysis, because the oxygen content in the air is as high as 21% oxygen, and if it is improperly handled, it will easily pollute and interfere with the sample, resulting in inaccurate analysis data. The main reason is the improper operation of the oxygen analyzer. The following factors affect the determination:

  1. Simplification and cleanliness of the oxygen analyzer gas path system

Micro-analysis requires that all kinds of pipe fittings, valves, gauges, etc. in the gas path must be effectively excluded from contamination of the sample gas. Therefore, the gas path system should be simplified as much as possible, and connecting pieces with small dead angles should be selected. In addition, avoid using water seals, oil seals, wax seals, and other equipment to prevent dissolved oxygen from escaping and causing pollution. It is also necessary to avoid adding purification equipment that can easily cause pollution to the pipeline leading to the inlet of the oxygen analyzer. Only in this way can the system be kept clean and the data obtained accurate.

  1. Contamination of the oxygen analyzer

When reusing the oxygen analyzer, you must first pay attention to whether there is air leakage when connecting the sampling pipeline, and you must carefully blow out the leaked air, and try not to let a large amount of oxygen pass through the sensor to extend the sensor life. In the purification process of the pipeline system, in order to shorten the purification time, a certain method is needed. Generally, high-pressure deflation and small flow blow-off are used alternately to quickly clean the pipeline.

  1. Selection of pipe material

The pipe material and surface roughness will also affect the changes in the oxygen content in the sample gas. Generally, plastic pipes and rubber pipes are not suitable for connecting pipes. Generally, copper or stainless steel tubes are used. For ultra-micro analysis (refer to <0.1ppm), polished stainless steel tubes must be used.

Precautions for using the oxygen analyzer

  1. Leakage of oxygen analyzer

The oxygen analyzer must be rigorously leak-tested before initial use. The oxygen analyzer can only obtain accurate data results under the premise of no leakage. Any inadequate connection points, solder joints, valves, etc. will cause the reverse osmosis of oxygen in the air to enter the pipeline and the inside of the oxygen analyzer, resulting in high oxygen content results.

Precautions for using the oxygen analyzer:

① The sample gas needs to be pressure-controlled. Generally, the pressure of the sample gas should not be greater than 0.05MPA;

② The output pressure of the secondary gas gauge should not be greater than 0.30MPA;

③ All gas pipelines entering the instrument must undergo strict leak detection, and this work must be carried out once every six months when the instrument is working normally;

④ Before entering the instrument through the gas path, it must pass through a physical filter, 10u; if the air blocking phenomenon is found, you can check the filter (filter) first;

⑤ Regularly clean the fan filter of the oxygen analyzer once every quarter. The environment is harsh and needs to be cleaned frequently to prevent overheating of the instrument caused by poor ventilation;

⑥ The installation site of the instrument should be level and away from the vibration source; to prevent the error caused by uneven convection of the sample caused by the detector not being level;

The surrounding environment of the analyzer requires good ventilation, and closed spaces must not be used. Measurement errors caused by unbalanced oxygen levels;

Avoid flammable gas around the analyzer, which will seriously affect the accurate measurement of the detector;

⑨Because the test is operated at high temperature, if the gas to be measured contains H2, CO, and CH4, this substance will react with oxygen, consume some oxygen, and reduce the oxygen concentration, causing measurement errors. Therefore, when measuring the gas containing flammable substances, the instrument should consider this factor accordingly to avoid measurement inaccuracy;

When measuring containing corrosive gas, filter with activated carbon first.

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