Heat losses in the Accelerating Rate Calorimeter may be divided into two types. Heat lost into the bomb (the phi correction) and heat lost from the bomb. The latter, the φ correction is discussed in detail in THT Technical Information Sheets No 22, 23, 24.

In the Accelerating Rate Calorimeter, the φ correction is the only correction necessary to carried out with the sample data to get excellent adiabatic data. In experiments a full simulation of the potentially undesired chemical reaction is carried out. When this is done under conditions which do not lead to self-heating rates so high that the accurate tracking or following of the bomb/sample by the calorimeter is lost there are no errors in the data. There is a limit of maximum heating of the calorimeter and of course if the self-heating of the sample/bomb exceed this, then there is a divergence in temperature and the possibility of heat loss from the sample/bomb system. Ie a loss of
operational adiabaticity.


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Reference:
ARC Technical Information Sheet No. 21, Thermal Hazard Technology, UK