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WDS 400sartorius Omnimark |
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Thermal analysis and the coulometry principle have been combined in the WDS 400, enabling powerful and remarkably accurate moisture analysis.
Advantages:
Detect the pure water content H2O
Environmental friendly by using electrochemical technique, it is similar to Karl Fischer titration; however, it does not require any complicated handling and use of toxic regents.
The testing cost is less expensive than Karl Fischer Titration method
Without any carrier gas
Simple Testing method
Easy to operate, no need special training
Characteristic:
For measurement of water content in solid and pasty samples
Accuracy up to 1 ppm detection limit
Selective differentiation among surface and capillary water and water of crystallization
Ideal alternative to classic Karl-Fischer titration
Working Principle:
The WDS 400 adopts the principle of convection heating from the oven drying method in order to drive out the entire moisture from a sample. A ceramic disc coated with extremely hygroscopic phosphorus pentoxide P2O5 completely absorbs the water from the resulting gas mixture and bonds water molecules to phosphoric acid H3PO4 on the disc surface in a chemical reaction. By coulometry, i.e, by an electric current generated at the into phosphoric acid is broken down into phosphorus pentoxide P2O5 , hydrogen H and oxygen O. Based on Faraday’s law, it is known how much current is necessary in order to split off all hydrogen atoms from a chemical compound. Thus, WDS 400 uses the amount of electric current to calculate the quantity of water driven out of a sample.
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