METTLER TOLEDO

Guide to Moisture Analysis

Correct Installation, Flawless Operation, Quick Measurement, Precise Results -
With Halogen Moisture Analyzers

Moisture affects the processibility, shelf life, usability and quality of many products such as pharmaceutical substances, plastics and foods. Information about and monitoring of moisture content is therefore very important. Most substances have an optimum moisture content for obtaining the best possible processing results and therefore attaining maximum quality.

Furthermore, moisture content impacts on price and there are statutory rules for some products governing the maximum permissible moisture content (e.g. as defined by national food regulations).

This means that trade and industry need to determine moisture content levels. These moisture determinations need to be carried out reliably and at speed so that any interventions in the production process can be made quickly to avoid interruptions.

One quick and accurate way of determining moisture is thermogravimetric measurement using a Halogen Moisture Analyzer: The sample is weighed and heated with an infrared radiator (halogen lamp). The loss in weight is continuously recorded and drying ends once a defined criterion is reached. The moisture content is automatically calculated from the difference in weight (Measuring principle).

During thermogravimetric measurement, the loss in mass cannot just be selectively assigned to a loss of water because substances other than water may evaporate when heated. This is why we speak of moisture content when using thermogravimetric procedures (Technical Terms).


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