Abstract
Several factors in temperature measurement (T.M.) and temperature control (T.C.) that can affect the precision of thermogravimetry will be discussed. The type of current thermobalance can be classified into three types by the location of the T.M. and T.C. sensors on thermobalance, as shown in Fig. 1. Using the thermobalance which its T.C. sensor is located near furnace, the heating rate is slowed down and then the biginning and finishing temperatures of the decomposition are shifted towards higher temperature side during endothermic thermal decomposition process in isochronal thermogravimetry. Advantages can be obtained in using the thermobalance, dcsigned by authors, which has only one temperature sensor for both of T.M. and T.C. and uses a radiant image furnace with infrared lamps of low heat capacity for the purpose of precise thermogravimetry in both the constant heating rate and isothermal stepwise heating/cooling modes.
The location of T.M. and T.C. sensors in thermobalance used should be expressed with the other measuring canditions, such as heating rate, in the report of thermogravimetry.
