By O. Toft Sørensen, J. Rouquerol
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Extra info for Sample Controlled Thermal Analysis: Origin, Goals, Multiple Forms, Applications and Future
In 1990 , which is to use, for the heating control, not one but two Pirani gauges, with the second one on the vacuum side of the diaphragm, so as to take into account, if needed, any change in the vacuum provided by the pumps. It has not been our experience that this association of two Pirani gauges was ever necessary: we prefer to check that the vacuum provided by the pumps is at least 2 orders of magnitude better than the residual pressure desired over the sample, which is the only way to ensure, during the experiment, both a constant pressure and a constant rate.
Q) r- 5 ~ --.... c 01) Q) ~ 75 600 T e~perature / C 1400 Figure 3-20. 6. THE DYNAMIC HEATING TECHNIQUE (OPFERMANN) (M. READING) Dynamic heating proposed by Opfermann  where the algorithm regulates the heating rate during the reaction in such a way that the rate is high in the beginning and at the end of the reaction but slow during the middle part of the reaction where the rate of transformation is high. This technique, which is designated by Netzsch as Dynamic TA, both shorten the overall measuring time and improves the resolution.
26 1. < Vector gas ... Furnace Heating control . - .. Thermocouple Flow-meter . - - - -Glass sinter IR gas analysers Figure 3-5. CR-EGA set-up with vector gas and two IR analysers (after ). 3. CONSTANT RATE THERMOGRAVIMETRY (CR-TG) Quasi-Isothermal Quasi-Isobaric TG (Paulik, Paulik and Erdey, Budapest, 1965-1971) The name "Quasi-Isothermal Quasi-Isobaric TG" was proposed by J. and F. Paulik in 1971, when they published their first results obtained with this method , but the "quasi-isothermal" principle was already described in their first patent published in 1965 , where a figure similar to Figure 3-6 can already be found.