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How to prevent the needle from not bending when injecting sample into DGA?
1. Do not secure the sealing gasket at the injection port too tight;2. Focus on the injection port;3. Do not push the syringe violently;4. Make sure there is no pollution in syringe;5. Injecting sample stably and smoothly.
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Be careful when replacing sealing gasket at the injection port of DGA (GC)
1. Some sealing gaskets needs to be heating for 1 - 2 hours at 300 degree Celsius before installtion;2. Usually, the replacement is carried out at the room temperature. Do not secure too tight. When the temperature rises, the sealing gaskets will be tight naturally. The sample injection will be difficult ...
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When to replace the sealing gasket at the injection port of DGA (GC)
1. If it is so easy to inject the sample, you should consider the replacement of sealing gasket at the injection of DGA;2. When the pressure of the column decreased comparing with the previous pressure under the same conditions, there might be some gas leakage;3. The irregular peaks displayed.
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Notices on injecting sample into the DGA (GC)
1. The hands should not touch the needle part of the syringe. Otherwise, it will be likely to cause the evaporation of low boiling solution;2. There should be no bubbles in the syringe;3. Fast sample injection;4. The sample injection speed should be the same each time;5. Fast to pull out the syringe.
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Used oil re-refining
Used oil re-refining is the process of restoring used oil to new oil by removing chemical impurities, heavy metals dirt, water, etc. Used Industrial and automotive oil is recycled at re-refineries. The used oil is first tested to determine suitability for re-refining, it is then dehydrated in order to ...
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Karl Fischer Titration for Analyzing Water Content in Oil
Oil samples are analyzed for water content (moisture) using the Karl Fischer moisture titration. This analysis method is particularly useful at detecting both high moisture contents and trace moisture contents. The process was invented by a German chemist named Karl Fischer in 1935.The testing process ...
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Why the Du Noüy ring is made of platinum?
The Du Noüy ring is made of platinum. Material platinum is used because it wets perfectly, which simplifies the measurements. Actually any shape of probe can be used (besides ring shape), as long as it has a regular geometry, for instance, a rod probe can be used for low volume. A plate probe is also ...
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What is Du Noüy ring method?
Du Noüy ring method is a technique by which the surface tension of a liquid is measured. It involves slowly lifting a platinum ring from the surface of a liquid. The force required to raise the ring from the liquid's surface is measured and related to the liquid's surface tension.This method was proposed ...
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General information on petroleum products for Karl Fischer application
Petroleum products are mixtures of long-chain or aromatic hydrocarbons. They are hardly soluble in methanol. Water determination by Karl Fischer therefore requires the addition of solubilisers. For light oils, long-chain alcohols are suitable. For dissolving of heavier oils toluene, xylene or chloroform ...
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General information on hydrocarbons for Karl Fischer application
Saturated hydrocarbons can in most cases be titrated according to standard methods. To overcome solubility problems of unpolar or weakly polar substances, the additiion of a solubiliser to the solvent is necessary. In the case of long-chain and cyclic hydrocarbons, long-chain alcohols (such as propyl ...
