Moisture Analysers

Moisture analyzers: What is it?

Moisture analyzers are highly advanced laboratory instruments used to measure moisture content in a variety of materials. These devices are usually fast, accurate and easy to use. They play an important role in industries where the moisture content of products is critical to quality and product shelf life.

How do moisture analyzers work?

Moisture analyzers work on the principle of thermogravimetric analysis (TGA). They use a combination of weighing and heating to determine the moisture content of a material. The process is explained in steps below:

1. Preparation of the material: the sample is carefully prepared and weighed to ensure that it is representative.


2. Initial weighing: The sample is placed in the moisture analyzer and the initial mass is measured.


3. Heating: The sample is heated slowly, causing the water it contains to evaporate.


4. Second weighing: During the heating process, the sample is weighed continuously. As soon as the weight no longer changes, the moisture content is determined.


5. Calculation: The moisture content of the material is calculated from the difference between the initial mass and the final mass.

The principle of Thermogravimetric Analysis (TGA)

Thermogravimetric analysis (TGA) is a powerful technique for determining the moisture content and other thermal properties of a material. This method is widely used in materials research, chemistry and other scientific fields. In TGA, the change in weight of a sample is measured while it is subjected to a controlled increase in temperature. This allows various information about the material to be obtained.

How does TGA work?

The basic principle of TGA is based on the fact that as the temperature rises, some materials lose weight as they release moisture or volatile components. Other materials, however, can gain weight as they attract more mass through chemical reactions or other processes.

The TGA apparatus consists of a precision balance on which the sample is placed and a heating device that raises the temperature in a controlled manner. The sample is slowly heated while the balance continuously measures the weight of the sample. The temperature and weight data are recorded graphically and can be analysed later.

Applications of moisture analyzers

Moisture analyzers are used in a wide range of industries where the determination of moisture content is of great importance. Here are some of the most important applications:

• Food industry: in the production of food, control of moisture content is crucial to ensure the shelf life and quality of the products. Moisture analyzers are used to monitor the moisture content of foods such as cereals, meat, biscuits and many others.


• Pharmaceutical industry: In the pharmaceutical industry, the determination of moisture content is important to ensure the stability of medicines. Moisture analyzers are used in the quality control of medicines.


• Chemistry: In chemical laboratories, moisture analyzers are used to determine the moisture content of reagents and chemicals, as moisture can affect reactivity.


• Environmental: When testing soil samples, waste or environmental materials, moisture content determination is important to accurately determine composition.

Advantages of using moisture analyzers

Moisture analyzers offer several advantages that make them a preferred choice in many industries. Some of the most important advantages are:

• Fast results: Moisture analyzers typically provide accurate moisture readings within minutes.


• High accuracy: Thermogravimetric analysis provides high accuracy and precision in moisture determination.


• Easy to use: Most moisture analyzers are user-friendly and do not require extensive training.


• Versatility: Moisture analyzers can be used to test a wide range of materials, from food to chemical samples.


• Quality control: Moisture analyzers help maintain product quality and compliance with industry standards.

Gram FM – Precise moisture analyzer for research and laboratories

The Gram FM moisture analyzer is the ideal instrument for research and laboratory applications, based on proven thermogravimetric analysis (TGA). With an impressive readability of 5mg (FM-120) and 1mg (FM-120S), it provides accurate results for a wide range of samples.

The Gram FM’s multifunction display provides detailed information on sample moisture calculations. You get clear information on maximum and minimum resolution, heating time, switch-off mode, heating mode and the current heating procedure. The display also includes the temperature setting or current temperature, the moisture display as a 5-segment trend, and the percentage of solids and moisture content.

Another advantage of the Gram FM is its connectivity to an optional printer via an RS-232C cable for protocol printing according to GLP guidelines.

The heart of the Gram FM is the halogen heating unit, which allows maximum heating capacity and is much faster compared to infrared or oven heating methods. Three different heating modes are available to meet the specific requirements of your samples. The uniform heating of the sample and the choice of heating modes ensure excellent reproducibility and save valuable sample material.

With its easy-to-read LCD graphic display, the Gram FM moisture analyzer offers user-friendly operation and precise measurement results. It is a reliable partner for researchers and laboratories that need high-quality moisture measurements. Facilitate your analyses with the Gram FM and benefit from its precision and efficiency.

Moisture analyzer: Best practices for accurate measurements

To get accurate and reliable results from your moisture analyzer, follow some best practices:

• Calibration: perform regular calibrations to ensure that the instrument provides accurate measurements.


• Sample preparation: Ensure that samples are properly prepared and representative of the material.


• Maintenance: Keep the moisture analyzer clean and in good condition to ensure accurate results.


• Use standard methods: Follow recognised standard methods and protocols for moisture determination.


• Documentation: Keep detailed records of measurements taken for future reference.

Moisture analyzers are powerful instruments that allow accurate determination of the moisture content of materials. Whether in the food, pharmaceutical, chemical or environmental industries, these devices play a crucial role in quality assurance and product development. With the right approach and care, you can get the best results from your moisture analyzer, optimise your processes and ensure high-quality products.

Frequently asked questions about moisture analyzers

How often should I have my moisture analyzer calibrated?

The frequency of calibration depends on the frequency of use and the requirements of your application. In general, it is recommended to calibrate the moisture analyzer every few months or as recommended by the manufacturer.

Can I use the moisture analyzer in harsh environments?

Moisture analyzers are generally designed for use in laboratories or controlled environments. Operating in harsh environments can affect accuracy and damage the instrument.

Can a moisture analyzer measure the moisture content of gases?

No, moisture analyzers are designed to measure the moisture content of solids and liquids. Special gas moisture analyzers are required to measure the moisture content of gases.

How are the moisture readings to be interpreted?

The interpretation of moisture readings depends on the type of material and the application. In some cases a higher moisture content is acceptable, while in others a lower value is preferable. Consult industry-specific guidelines and standards to understand moisture requirements.