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Domov Po aplikaciji Laboratory Weighing Applications Moisture Content Determination

Moisture Content Determination

How to Get Reliable Moisture Results with Halogen Moisture Analyzers

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Moisture Content Determination

Moisture content affects the processibility, shelf-life, usability and quality of a product. Accurate moisture content determination therefore plays a key role in ensuring quality for many industries including Food, Pharmaceuticals and Chemicals. Furthermore, the maximum permissible moisture content in certain products may be governed by legislation (e.g., national food regulations).

Typically, moisture content is determined via a thermogravimetric approach, i.e., by loss on drying, in which the sample is heated and the weight loss due to evaporation of moisture is recorded.

There are many stages of the production process where moisture determination benefits the overall quality of the finished product: raw materials, goods-in, storage, in process control, QC, packaging, etc.

However, the reference method for loss on drying (drying oven method) can take many hours to reach a result. A METTLER TOLEDO instrument provides comparable and traceable results in less than 15 minutes.

Our Guide to Moisture Analysis provides information about the key points which are important for working with moisture analyzers and helps you to quickly, reliably and effortlessly determine moisture content.

Fast and Reliable Moisture Analysis

Reliable and Fast Moisture Analysis

METTLER TOLEDO is an expert in moisture analysis and offers a wide range of reliable and easy to use moisture analyzers to suit the needs of quality control, production and in-process control of many industries, such as pharma, plastics and the food industry.

Select the right moisture analyzer

Selecting The Best Instrument for Moisture Analysis

Our guide leads you through the important criteria to consider when purchasing a moisture analyzer. From interpreting technical specifications to understanding the functionality and performance of the instrument from a holistic point of view.

Accessories and Software for Moisture Analyzer

Software and Accessories for Moisture Analysis

Learn how the right data management software and sample handling accessories can improve your results
 

Industry Solutions

Learn about Moisture Analysis in Pharmaceuticals

Moisture Analysis in Pharmaceuticals

Moisture Analysis in Chemicals

Moisture Analysis in Chemicals

Moisture Analysis in Food and Beverages

Moisture Analysis in Food and Beverages

Moisture Analysis in Waste Water

Moisture Analysis in Waste Water

Moisture Analysis in Plastic

Moisture Analysis in Plastic Pellets

Moisture Analysis in Wood Pellets

Moisture Analysis in Wood Pellets

Method Development

Learn about Moisture Method Development

Moisture Analyzer Method Development

Using the right method for a moisture analysis is crucial to achieve repeatable results, which are comparable to the reference procedure (typically the drying oven).

To find a suitable moisture method you need to understand the characteristics of your sample and choose suitable method parameters such as the drying program, drying temperature and switch-off criterion, as well as appropriate sample preparation. 

Routine Testing

Learn about Calibration and Testing

Calibration and Testing

The accuracy of a moisture analysis result may be influenced by several factors. The most important is variability of the heating temperature, followed by the weighing performance.

Routine testing of the heating and weighing unit are therefore necessary to ensure reliable determination of the moisture content and correct functioning of the instrument. In addition to these tests, the SmartCal test substance offers a fast and easy way to verify the overall instrument performance.

FAQ - Moisture Content Analysis

Frequently Asked Questions on Moisture Content Determination

 

Select your Question:

  1. What is the drying oven method?
  2. How are samples heated in the drying oven and in the moisture analyzer?
  3. Isn't moisture the same as water?
  4. Why is moisture important?
  5. I have many different samples (liquid, pasty, solid, powder). Which method should I use for moisture content determination?
  6. We have to use the standard method with the drying oven but using a moisture analyzer would really speed up our processes. Is it possible?
  7. How can I put the batch number on the printout from my moisture analysis?
  8. I am using the drying oven procedure. How can I avoid errors when I'm recording results and doing calculations?
  9. How can I avoid my crucibles getting mixed up in the drying oven?
  10. What is the difference between moisture content, dry content and ATRO moisture?
  11. What do TS and DC stand for?
  12. Is there a difference between dry content (DC) and total solids (TS)?


 

1. What is the drying oven method?

The drying oven method is a thermogravimetric method (loss on drying) in which the sample is dried for a defined period of time at constant temperature. The moisture content is determined by weighing the sample before and after drying and determining the difference.


 

2. How are samples heated in the drying oven and in the moisture analyzer?

In the drying oven, samples are heated by convection. This means the samples are at the same temperature as the drying oven. When using a moisture analyzer, the sample heats up and dries by absorbing infrared radiation from the heating element. The sample's temperature and drying time depends on its absorption characteristics.


 

3. Isn't moisture the same as water?

This is a common misconception. Everything which evaporates upon heating is named moisture. Water may be a part of this but there may be other substances which also evaporate, such as alcohol or solvents.

 


 

4. Why is moisture important?

Moisture affects the processability, 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).

 


 

5. I have many different samples (liquid, pasty, solid, powder). Which method should I use for moisture content determination?

In general, all kinds of samples are suitable for both the drying oven and the halogen moisture analyzer. Which method is best for you, depends on how fast you need the result or if you need the result using an official method. Sometimes, for example, in goods-in or final product quality control, moisture analyzers are used in parallel with a drying oven. Fast analysis with the moisture analyzer is done to optimize processes and the drying oven is used for official documentation purposes.

 


 

6. We have to use the standard method with the drying oven, but using a moisture analyzer would really speed up our processes. Is it possible?

Many industry regulations require manufacturers to follow a standard method. However, it is acceptable to use a moisture analyzer if you can prove its results are the same as those from the drying oven procedure and are of the same level of accuracy. This requires developing a drying method for the moisture analyzer and cross-validating it against the drying oven through a series of analyses. METTLER TOLEDO's application database contains over 100 free ready-to-use cross-validated drying methods. Contact us if you don't find what you need.

 


 

7. How can I put the batch number on the printout from my moisture analysis?

You can do this either through the ID management functionality on our moisture analyzers or in the differential weighing application on our balances. If your batch number is a barcode, you can even connect a barcode reader to scan it, or any other ID.

 


 

8. I am using the drying oven procedure. How can I avoid errors when I'm recording results and doing calculations?

Manual processes are more prone to error so it's best to use the built-in balance application or a software solution (LabX™) with a balance to capture all the results and do the calculations automatically. It's not only much faster but it's error-free too. Results can be printed out for your lab journal or saved on a USB stick to be saved electronically. LabX saves everything in a secure database so you can be sure your data is safe. The LabX report generator enables you to create elegant reports with charts which can be printed out or saved electronically.

 


 

9. How can I avoid my crucibles getting mixed up in the drying oven?

Good labelling is key. Using barcode labels uniquely identifies each sample. A barcode reader attached to the balance ensures that no mix-ups occur and weighing results are correctly logged against each sample. Use of a barcode reader is fully supported by the differential weighing application on the balance and by LabX.

 


 

10. What is the difference between moisture content, dry content and ATRO moisture?

Moisture content is the amount of moisture in the sample given as a percentage of the sample's original (wet) weight. Dry content is the amount of solids which are left after drying given as a percentage of the sample's original (wet) weight. ATRO moisture (AM) is the amount of moisture in the sample given as a percentage of the sample's final (dry) weight. Different industries use different units e.g. in wood or pulp, ATRO is commonly used.

 


 

11. What do TS and DC stand for?

The loss on drying procedure can be used to determine moisture content (MC) or, alternatively, dry content (DC). A sample may undergo extensive drying to remove all the moisture. The dry content remaining may be termed the total solids (TS).

 


 

12. Is there a difference between dry content (DC) and total solids (TS)?

Dry content and total solids mean the same thing. They describe the amount of material remaining after all the moisture has been evaporated.