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Industrial scales, electronic balances, calibration weights and moisture analysers - order online, telephone 01842 751633 or email for advice, a quotation or to place an order

A Guide To Moisture Analysers

What Is A Moisture Analyser?

What Is A Moisture Analyser?

A Moisture Analyser, or Moisture Balance, is a balance with a built in heating chamber to dry a product and then use the before and after weights to provide an accurate moisture reading. Moisture analysers are suitable for determining moisture in food products, grain, straw and hay, wood products, plastics & waste water. Please read on or call our friendly and knowledgeable sales team on 01842 751633 for advice on the most suitable product for your application, or view our range of Moisture analysers on our scalesandbalances website

How A Moisture Analyser Measures Moisture Content

Moisture content can be measured by various methods, including drying, the Karl Fischer method, the dielectric method, the infrared absorption method, a neutron analyser and the crystal oscillation method. Of these methods, heating and drying, and the Karl Fischer method are most frequently used in laboratories. In the heating method used by moisture analysers, the sample is dried by heating, and its water evaporates. The moisture content is acquired by the reduction in sample mass after drying. Weight loss gradually increases as a sample gets heated and finally reaches a constant value at which time the result is displayed

Potential Problems And Advantages Of Moisture Analysers

Depending on the product's characteristics, samples may thermally decompose and vaporize if the heating temperature gets too high, which may result in a loss in mass that is not completely water, and this can cause an error in the results. However, optimal sample sizes, along with optimal heating conditions such as temperature and heating time can give results that are comparable to those obtained by methods, such as the Karl Fischer method. Please give us a call to discuss your requirement and we can advise you on the optimal temperature. Compared to other methods, heating has clear and simple measurement principles and procedures. Furthermore, it requires a minimal amount of equipment, which can be purchased, run, and maintained at a low cost. Due to these factors, it is suitable for a wide range of users and applications (samples). Its measurement range is from 0.01% or 0.1% to 100%, so even samples with almost 100% moisture content can be correctly and easily measured

Sample Sizes

For most products a prepared sample with a weight of 10g will give an even layer on the base of a sample tray.This is ideal because you will get a fast result and it will allow all the moisture to evaporate rather than some becoming trapped under a skin or crust

Preparing A Sample

Where possible the product should be placed on a sample tray in a powder or crushed form so that the moisture can evaporate quickly and fully. We recommend using disposable sample trays that are available for all the moisture analysers, or alternatively make sure that your re-usable sample tray is clean and totally dry prior to use, otherwise your results will be compromised. If you are using a wet sample that is likely to form a skin, such as milk, then we recommend using fibre pads on top of the sample pans to give the sample a 3D profile. This will allow the sample to dry fully without the skin becoming thick enough to trap moisture

A&D Moisture Analyser User Guide

The A&D moisture analyser user guide provides further information including a suitable drying temperature tables