Abstract
A detailed investigation has been made of the relative merits of various possible means of temperature control available with the Perkin-Elmer System 4 microprocessor controller for the TGS-2 thermogravimetric system. The dynamic compensating factor or rate parameter of the controller may be put to far more extensive use than indicated in the instrument operating manual. Temperature calibration by use of magnetic standards has enabled the development of mathematical relationships for the prediction of the appropriate value for the rate factor. Over the entire working range of the instrument and over a wide range of temperature programming rates, it is now possible to select the value of this parameter such that the sample and programmed temperatures agree within ± 2°C. Two procedures have been developed for use at low and high programmed heating rates: the fixed and variable rate factor methods. The merits of these procedures are discussed and compared with the internal calibration method.
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