Precautions when using the trace oxygen analyzer:
1. The matching pipeline of the analyzer should ensure the sealing. The slight leakage will make the oxygen in the ambient air diffuse in, which makes the measured value higher. Although the sample gas pressure is greater than the ambient pressure during the measurement, the oxygen in the sample gas is micro-scale. According to Ferrari's law, the partial pressure of oxygen is proportional to its volume content. The atmosphere contains about 21% oxygen, and PPM. The oxygen partial pressure of the sample gas of the calculated concentration differs by about 10,000 times, so the partial pressure of the trace oxygen in the gas sample is much lower than the partial pressure of oxygen in the atmosphere. When a leak occurs, the oxygen in the atmosphere will rapidly diffuse from the leak. Come in. Also, the sampling pipeline should be as short as possible, the joints should be as small as possible, and the joints and valves should be sealed well. After the pipelines are connected, air tightness inspection should be done.
Requirements for air tightness test: Under 0.25 MPAm test pressure, the pressure drop is not more than 0.01 MPA for 30 minutes.
2. The pipeline material is basically made of copper or stainless steel pipeline, and the secondary PTFE tube is selected. Forbidden selection of pipes such as latex tubes and white hoses, the air tightness and material resistance are too poor, and the measurement of trace oxygen is too much error under standard measurement pressure. The outer diameter of the pipeline is usually 6mm or 1/4IN. We also choose 3mm or 1/8IN. In short, **stainless steel tube, clean and degrease, keep the inner wall of the tube smooth and clean, for the analysis of trace level (<1PPMV) oxygen The stainless steel tube polished on the inner wall should be selected. The selected valve and joint should be as small as possible.
3. In order to prevent the moisture in the sample from condensing and condensing on the pipe wall, causing the dissolution and absorption of trace oxygen, the sampling pipeline should be insulated or heat-insulated according to the situation. When detecting trace oxygen in liquid nitrogen, it is especially necessary to pay attention to the heating measures. Otherwise, since the boiling point of oxygen is lower than the boiling point of nitrogen by 13 degrees, the sample gas is not uniformly vaporized, which will cause the measured value to be seriously low.
4. In principle, the measurement position of the trace oxygen analyzer should be as close as possible to the measurement unit to avoid excessively long pipelines and excessive uncertainties, affecting the reliability of the measurement data.
5. The sample gas should not contain oil components or solid particles to avoid clogging and contamination of the permeable membrane.
6. The sample gas should not contain sulfide, phosphide or acid gas components. These components can be harmful to fuel cells, especially alkaline fuel cells. Chengdu Jiuyin Technology provides you with a complete set of technical solutions.
1. The matching pipeline of the analyzer should ensure the sealing. The slight leakage will make the oxygen in the ambient air diffuse in, which makes the measured value higher. Although the sample gas pressure is greater than the ambient pressure during the measurement, the oxygen in the sample gas is micro-scale. According to Ferrari's law, the partial pressure of oxygen is proportional to its volume content. The atmosphere contains about 21% oxygen, and PPM. The oxygen partial pressure of the sample gas of the calculated concentration differs by about 10,000 times, so the partial pressure of the trace oxygen in the gas sample is much lower than the partial pressure of oxygen in the atmosphere. When a leak occurs, the oxygen in the atmosphere will rapidly diffuse from the leak. Come in. Also, the sampling pipeline should be as short as possible, the joints should be as small as possible, and the joints and valves should be sealed well. After the pipelines are connected, air tightness inspection should be done.
Requirements for air tightness test: Under 0.25 MPAm test pressure, the pressure drop is not more than 0.01 MPA for 30 minutes.
2. The pipeline material is basically made of copper or stainless steel pipeline, and the secondary PTFE tube is selected. Forbidden selection of pipes such as latex tubes and white hoses, the air tightness and material resistance are too poor, and the measurement of trace oxygen is too much error under standard measurement pressure. The outer diameter of the pipeline is usually 6mm or 1/4IN. We also choose 3mm or 1/8IN. In short, **stainless steel tube, clean and degrease, keep the inner wall of the tube smooth and clean, for the analysis of trace level (<1PPMV) oxygen The stainless steel tube polished on the inner wall should be selected. The selected valve and joint should be as small as possible.
3. In order to prevent the moisture in the sample from condensing and condensing on the pipe wall, causing the dissolution and absorption of trace oxygen, the sampling pipeline should be insulated or heat-insulated according to the situation. When detecting trace oxygen in liquid nitrogen, it is especially necessary to pay attention to the heating measures. Otherwise, since the boiling point of oxygen is lower than the boiling point of nitrogen by 13 degrees, the sample gas is not uniformly vaporized, which will cause the measured value to be seriously low.
4. In principle, the measurement position of the trace oxygen analyzer should be as close as possible to the measurement unit to avoid excessively long pipelines and excessive uncertainties, affecting the reliability of the measurement data.
5. The sample gas should not contain oil components or solid particles to avoid clogging and contamination of the permeable membrane.
6. The sample gas should not contain sulfide, phosphide or acid gas components. These components can be harmful to fuel cells, especially alkaline fuel cells. Chengdu Jiuyin Technology provides you with a complete set of technical solutions.
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