3.3 Melting Point Capillary Sample Preparation.3.2 Quick and Reliable Sample Preparation: The Capillary Filling Tool.If calibration fails, which means if the measured temperature values do not match the range of the certified nominal values of the respective reference substances, we need to adjust the instrument. Thus, we can compare nominal values including tolerances with actual measured values. Therefore, in order to check the temperature accuracy, we use reference substances ideally with certified temperature values. In the previous chapter we learned that we cannot measure the sample temperature directly using a certified thermometer. 3.1 Instrument Calibration and Adjustment If we want to make sure that the melting point instrument is providing the correct results, we need to verify its measurement accuracy.2.3 Automatic Melting Point Determination: The Measurement Principle.2.2 Automatic Melting Point Determination: The METTLER TOLEDO MP Excellence Instrument Line.This behavior is known as melting point depression and can be used to obtain qualitative information about the purity of a substance. The temperature at which all material of a contaminated substance is molten is usually lower than that of a pure substance. Pure substances melt at a highly-defined temperature whereas impure, contaminated substances generally exhibit a large melting interval. Automatic melting point determination methods make use of these phenomena, which become visible during the change in aggregate state. Crystalline and molten states of the same material can only exist at the same time at the melting point. Pure crystalline substances change to the liquid state at a precisely defined temperature, which is specific for each crystalline material. Since melting point is highly dependent on purity, it can also be used for evaluating the quality of substances. Melting point is easy to determine and, since it is a numerical property, can be conveniently tabulated and classified. 2.1 General Considerations Determination of melting point is one of the oldest methods of identification and testing, particularly for organic substances.These are highlighted in this guideline in addition to fundamental knowledge about melting, dropping and softening point determination and practical application tips for daily use. The melting point and Dropping Point Excellence line, METTLER TOLEDO’s latest release of compact instruments for thermal characterization, support the complete analytical workflow with innovative solutions. The exact thermal characteristics of almost all pure organic and inorganic substances, however, can be found in comprehensive tables.įor almost 5 decades METTLER TOLEDO has provided instrumental solutions for the automatic determination of the thermal values melting point, dropping and softening point. These empirical values are dependent on the measurement method used and thus require a sensible standardized procedure. Such accurate data is associated with the equally important, but more empirical, thermal characteristic: dropping or softening point of industrial or naturally-occurring products. The melting point is the temperature at which the solid phase changes to the liquid state. The thermal characteristics of a substance or mixture of substances, such as melting point, provide valuable and accessible information in this respect. In order to characterize a material aside from chemical analysis, primarily physical methods allow us to differentiate between, identify and classify substances or to provide descriptions of quality. User skills and knowledge (theory of applications, technologies, methods, tips and tricks).Time reduction quick adjustment and scalability of methods.Sustainable design (futureproof modular design long lasting).Shift to the next level measurement process (from manual to automated, or to on-line measurement automation).Reduction in operating costs Total cost of ownership Maintenance cost reduction.Productivity (released time from the team) Uptime Optimize processes.Preventive maintenance Minimize downtime.Connectivity Software solutions Data flow from one instrument to another.
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