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Sample Extraction / Sample Take-Off Connection
A good sample extraction technique is important for the success of the total analytical solution. Depending on the application and the purpose of the measurement the sample extraction point and the sample extraction technique should be carefully selected. Items to consider are:
- What kind of components are present in the water? Non-organic particles like sediments, particles with an organic content (POC), free oil, foam, air/gasses, hydrocarbons, carbonates, salts etc.;
- What is the process pressure and temperature? Extra care must be taken for steam and hot water applications to make sure that safe operation is guarantied;
- What do we want to analyse? Do we want to analyse true TOC (including the organic content in the particles) or NPOC (non particulate organic carbon)? Do we want to analyse soluble mineral oil excluding/including the free oil? Do we need to extract the sample without the foam and/or air/gasses?
- Do we want the sample composition that will be extracted to be the same as that of the total actual waste water stream? It makes a big difference taking the sample from a turbulent flow or from a laminar flow. Sometimes we introduce a big sample extraction pump with feedback to create a turbulent flow. In other cases we extract the sample deep below the water surface to eliminate free oil;
- Is the position of the sample probe correctly. For example; do not extract sample from a process pipe at the lowest position. Particles that move via the pipe bottom will get tracked in the sample line causing problems.
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