1. The supporting pipelines of the analyzer should be sealed, as even small leaks can cause oxygen in the ambient air to diffuse in, resulting in higher measurement values.

Although the sample gas pressure is greater than the ambient pressure in the measurement, the oxygen in the sample gas is in the trace level. According to Ferrari's law, the partial pressure of oxygen is proportional to its volume content, and the atmosphere contains about 21%Oxygen, with a concentration calculated in PPM, differs by about ten thousand times from the oxygen partial pressure of the sample gas. Therefore, the partial pressure of trace oxygen in the gas sample is much lower than that in the atmosphere. When a leak occurs, the oxygen in the atmosphere will be releasedThe leaking area quickly spreads in.Also, the sampling pipeline should be as short as possible, with as few joints as possible, to ensure good sealing of joints and valves. After the pipeline is connected, an air tightness check should be conducted.Requirements for air tightness inspection: Under a test pressure of 0.25MPAm for 30 minutes, the pressure drop should not exceed 0.01MPA.

2. Copper or stainless steel pipelines are generally preferred for pipeline materials, with polytetrafluoroethylene pipes being the second choice. Prohibit the use of tubes such as milk tubes and white tubes, as their airtightness and material impermeability are too poor. Measure trace amounts of oxygenThe error is too large under standard measurement pressure. We usually choose a pipeline outer diameter of 6mm or 1/4IN, but there are also options of 3mm or 1/8IN. In short, stainless steel pipes should be cleaned, degreased, and kept on the inner wall of the pipeSmooth and clean, for the analysis of trace level (<1PPMV) oxygen, stainless steel pipes with polished inner walls should be selected. The selected valves and fittings should have a minimum dead volume.

3. To prevent moisture in the sample from condensing on the pipe wall and causing the dissolution and absorption of trace oxygen, insulation or heat tracing measures should be taken for the sampling pipeline according to the situation. Detecting micro particles in liquid nitrogenWhen measuring oxygen, special attention should be paid to heating measures. Otherwise, due to the boiling point of oxygen being 13 degrees lower than that of nitrogen, the sample gas will vaporize unevenly, resulting in significantly lower measurement values.

4. In principle, the measuring position of the trace oxygen analyzer should be as close as possible to the measuring unit to avoid excessively long pipelines and too many uncertain factors that may affect the reliability of the measurement data.

5. The sample gas should not contain oil components or solid particles to avoid membrane blockage and contamination.

?6. The sample gas should not contain sulfides, phosphides, or acidic gas components. These components can pose a threat to fuel cells, especially alkaline fuel cells