KERN DLB 160-3A Operating Instructions Manual

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KERN DLB 160-3A Operating Instructions Manual Manual pdf 52 page image

52 DLB_A-BA-e-111012.7 Drying temperatureBear in mind the following factors when setting the drying temperature:Surface of the sample:Compared with powdery or grainy samples, liquid and spreadable samples have asmaller surface for the transmission of heat energy.The use of a glass fibre filter improves the heat application.Colour of sample:Light-coloured samples reflect more heat radiation than dark ones and therefore requirea higher drying temperature.Availability of volatile substances:The better and faster the water or other volatile substances can be disposed, the lowera drying temperature is required. If water is difficult to get to (e. g. in synthetics), it hasto be calcined at high temperatures (the higher the temperature, the higher the watervapour pressure).Results equivalent to other moisture analysing methods (e. g. drying chamber) can beachieved by experimentally optimising the setting parameters such as temperature,heating level and shutoff criteria.12.8 Recommendations / GuidelinesPrepare standard sample:- Crush sample, as required, and spread it evenly in the aluminium dish.Prepare special samples:- For sensitive or hard to spread test materials (e. g. mercury) a glass fibre filter isavailable for use.- Apply the sample equally on the glass fibre filter and cover it with a second glassfibre filter.- The glass fibre filter is also useful as a protection when splashing materials aredealt with (each splash falsifies the final result).