Discussion and recommendations on useful portable oxygen analyzers for the air separation industry
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In the air separation industry, the copper-ammonia solution absorption method specified in national standards is used to determine the purity of oxygen products on-site. Sampling can lead to errors, and it is not fast or convenient for measuring sample gases at locations where testing is required temporarily. Are there any portable oxygen analyzers with multiple specification connection ports that allow for on-site reading measurements?
Contact SERVOMEX; there are portable versions with magnets. The older models are the 575 type, while the current ones are smaller and lighter.
Yes, we also need to measure the oxygen level every day, using the potassium pyrogallate solution absorption method. Especially in winter, the absorption rate is slow and the errors are large, which is quite troublesome. It would be great if we could use a portable oxygen analyzer.
I have seen copper-ammonia solutions used to measure oxygen purity; only oxygen meters are used for measuring trace amounts of oxygen. Since it uses a fuel cell mechanism, it essentially reacts with oxygen. I’ll introduce you to several oxygen analyzers: the DFV-IBV oxygen analyzer, which is of the zirconia type and has a wide measurement range; the AIM-450 oxygen analyzer, used for safety analysis; and the EC-90 oxygen analyzer, designed for the detection of trace amounts of oxygen and suitable for use in fuel cells.
We all take samples for analysis; it would be extremely convenient if analysis could be done on-site
The TELEDYNE benchtop SH311 series is used for measuring trace and bulk quantities; many large air separation and petrochemical companies make use of it. For more detailed information, please contact me at pqw2121@163.com
I have used fuel cells that use trace amounts of oxygen; I didn’t notice that there are those that use constant amounts of oxygen. What type of fuel cell is being used? (solid)
Micro fuel cells also operate based on the electrochemical principles we’re usually familiar with: O2 + 2H2O + 4e⁻ → 4OH⁻; Pb + 4OH⁻ → Pb(OH)₂ + 4e⁻. In both cases, a reaction with oxygen is involved, so it’s certainly possible to measure the percentage involved. It’s just that you haven’t used them before; there are quite a few electrochemical oxygen analyzers that use percentage measurements
AALL’s oxygen analyzers are available in intrinsically safe, explosion-proof versions, with measurement ranges ranging from ppb to 100%. There are issues with the connectors; it is recommended that you purchase soldered bayonet connectors and use them for the valves at the sampling points. Bayonet connectors make it very convenient to connect the analyzers
Check whether the quantity is on a constant level or at a very low level. If it’s at a very low level, electrochemistry or zirconia should be used; zirconia is certainly more expensive, but depending on your perspective, in terms of performance and maintenance, zirconia is the better choice. For constants or high-purity oxygen, then paramagnetic oxygen should be chosen; or another approach can be used (high-purity oxygen), such as by measuring the impurities in it to determine its purity.