Tian-calvet microcalorimeter

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- Technics type : Calvet Calorimetry
- Line of products : Calvet calorimeters

• Temperature range: -196°C to 200°C
• Tian-Calvet type microcalorimeter
• Available with 12 mL
• Each vessel size is available with two programming and isotherm vessels in sub-ambient mode
• Capacity to control pressure
Tian-Calvet Microcalorimeter
The measurement of thermal effects in a Tian-Calvet type microcalorimeter is done by two fluxmeters (one on the measurement side and one on the reference side), each of which measures the thermal power exchanged constantly between the experimental vessel and the calorimetric unit.
The main difference in comparison to the DSC technique with a flat plate transducer is that the Tian-Calvet type fluxmetric transducer envelopes the sample and is therefore capable of measuring almost all the exchanges between the vessel and the unit, a characteristic that gives this device a clear metrological advantage in terms of both the quantity of the measurements and their sensitivity (capacity to measure very weak effects).
Another very interesting property stemming from the concept of the surrounding transducer design is that the experimental vessel can be physically connected to the exterior of the calorimeter without disturbing the measurement. This makes it possible to:
• perform calibration electrically that is much more precise than any calibration by fusion,
• use vessels that circulate a liquid or gas,
• control the pressure inside a vessel.
The BT215 microcalorimeter is composed of a sensitive area in which the part of the experimental vessel holding the sample is located.
When a sample transforms, reacts or is simply heated or cooled, it exchanges heat (absorbed or released) with the calorimetric unit surrounding it. This exchange of heat is done via each of the thermopiles (reference measurement). The signal supplied by the thermopiles therefore corresponds to the thermal power (or instantaneous heat) exchanged by the sample.
The calorimetric unit is regulated by a heating element coiled around it.
The calorimetric unit is placed inside a sealed chamber: the space outside the chamber can be filled with liquid nitrogen in order to lower the temperature of the calorimeter.
Among the experimental vessels offered, mention can be made of the following:
• Standard cells (at normal or at high pressure) which permit the study of single constituent or mixture that can be analysed in isotherm mode (stability or slow decomposition) or programmed mode (fusion, decomposition, polymerisation, etc.).
• “Vacuum” vessels that are the same as described previously, but which are connected to the exterior by a tube in order to maintain constant pressure up to 100 bar (or vacuum) in the vessel.
• The “circulation” vessels are similar to the cells described previously, but they have a double tube that links the interior of the vessel with the exterior in order to circulate gas inside the vessel at a given pressure.
• The mixture vessels: three vessels are offered: the rotating vessel, the injection vessel and the bulb vessel. These three models permit the study of interactions (reaction, polymerisation, hydration, dissolution, dilution) between two constituents.

Article from SETARAM instrumentation

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List of all articles in this sub-category Thermal analyzers and calorimeters

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