Abstract: A calorimeter includes a bucket cover which is used to reconfigure an isothermal water reservoir to provide for temperature equilibration prior to sample analysis and subsequently define a fixed volume of water during analysis in which high precision temperature measurements can be recorded. The apparatus includes mechanisms for sealing and controlling the cover, and for coupling the combustion vessel to the cover while minimizing the thermal contact between them. Improved thermal isolation between the fixed volume of water and the surrounding environment is also achieved.

Abstract: An automated apparatus for determining the calorific value of combustible substances employs an integrated, isothermal water reservoir to reduce the complexity of the apparatus and facilitates automation of the calorimeter by providing a convenient source of isothermal water. A moving divider is used to reconfigure the isothermal water reservoir to either provide for temperature equilibration prior to sample analysis or define a fixed volume of water during analysis in which high precision temperature measurements can be recorded. The apparatus includes mechanisms for controlling the moving divider, a sample holding combustion vessel, and loading, cleaning, and unloading the combustion vessel. This eliminates key analysis steps that had previously required manual intervention by an operator.