The supporting piping of the zirconia oxygen analyzer should ensure sealing, and a small leak will diffuse oxygen in the ambient air to make the measured value higher. Although the sample gas pressure is greater than the ambient pressure during the measurement. The supporting piping of the zirconia oxygen analyzer should ensure sealing, and a small leak will diffuse oxygen in the ambient air to make 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 is about 10,000 times different. Therefore, the partial pressure of 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. The sample gas should not contain sulfide, phosphide or acid gas components, nor oil components or solid particulates, as these components can cause damage to fuel cells, especially alkaline fuel cells. Therefore, we must avoid the problem of permeable membrane blockage and pollution. In order to prevent the moisture in the sample from condensing and condensing on the tube wall, causing the dissolution and absorption of trace oxygen, the sampling line should be taken according to the situation. Thermal insulation or heat insulation measures. 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. The pipeline material is basically made of copper or stainless steel "target=_blank> stainless steel pipeline, and the second choice is PTFE tube. The tube such as latex tube and white rubber tube is forbidden, and its air tightness and material resistance are too poor. Measuring trace oxygen is too much error under standard measurement pressure. The outer diameter of the pipeline is usually 6 (mm) or 1/4IN, and 3 (mm) or 1/8IN. In short, stainless steel "target=_blank> stainless steel tube is preferred. Clean and degrease, keep the inner wall of the tube smooth and clean. For the analysis of trace oxygen, choose the stainless steel "target=_blank> stainless steel tube polished on the inner wall. The selected valve and joint should have the dead volume as small as possible. In principle, trace The measurement position of the oxygen analyzer should be as close as possible to the unit of measurement to avoid excessive pipelines and excessive uncertainties, affecting the reliability of the measured data. Therefore, it is necessary to prepare before the operation, beforehand. Preparing for work is good for future measurements. The so-called sharpening does not miss the firewood. The above introduction hopes to help you, welcome you to our company to buy products. http://news.chinawj.co M.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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