When used in combustion processes they can ensure the fuel/air mixture is exactly right and can reduce fuel costs by thousands of dollars. Once installed they will run reliably for many months without needing any maintenance. Unlike other gas measurement technologies, TDLs have a very low maintenance requirement. The laser source is reflected by a three-sided mirror and is directed back to the receiver. The GPro 500 has both parts installed in the same unit. The two units have to be very carefully aligned which can be problematic. Most TDLs are of a cross-stack design, meaning that they’re comprised of two parts (laser source and receiver) that sit opposite each other in the pipe or vessel. Once the insertion point has been selected it’s a matter of fitting one or two flanges and a temperature and pressure sensor. Thirdly, they are extremely reliable and require practically zero maintenance. Secondly, TDLs are immune to the presence of other gases in the process and will only measure oxygen. Some other analyzers measure a sample of gas that has been extracted and conditioned, which takes time and increases risk. Firstly, they are installed in situ in the process pipe or vessel so are exposed directly to the gas and therefore measure immediately. TDLs have many advantages over other oxygen measurement technologies. Why use a TDL sensor for measuring oxygen?
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