The Thermal Gravimetric Analyzer (TGRavimetric Analyzer) is an instrument that uses the thermogravimetric method to detect the temperature-mass relationship of a substance. Thermogravimetry is to measure the mass of a substance with temperature (or time) under programmed temperature control.

Thermogravimetric analyzer mainly uses thermogravimetric method to detect the relationship between temperature and mass of substances. When the measured substance has sublimation, vaporization, decomposition of gas or loss of crystal water in the heating process, the quality of the sample will change, and the corresponding thermogravimetric curve can be obtained by analyzing the thermogravimetric curve, the mass change of the measured sample and the corresponding temperature and time point data. The thermogravimetric data obtained through the experiment is then analyzed to analyze and study its substance, so it is widely used in many fields.

Detailed instructions on thermogravimetric analyzers

Principles of thermogravimetric analyzer

When the substance under test sublimates, vaporizes, breaks down gas or loses crystal water during heating, the mass of the substance under test will change. In this case, the thermogravimetric curve is not a straight line but a decline. By analyzing the thermogravimetric curve, it is possible to know how many degrees the measured substance changes, and according to the weight loss, it is possible to calculate how much substance is lost (such as crystal water in CuSO4·5H2O).

Detailed instructions on thermogravimetric analyzers

There are two commonly used measurement principles, namely displacement method and zero method. The so-called displacement method is based on the proportional relationship between the tilt of the balance beam and the mass change, and the tilt is detected with a differential transformer and automatically recorded. The zero method uses the differential transformer method and the optical method to measure the tilt of the balance beam, and then adjusts the current of the coil installed in the balance system and the magnetic field, so that the coil rotates to restore the tilt of the balance beam, that is, the so-called zero method. Since the force exerted by the rotation of the coil is proportional to the change in mass, and this force is proportional to the current in the coil, a curve of the change in mass can be obtained by simply measuring and recording the change in current.
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