Process and apparatus for filling the inner boiler of a combustion calorimeter

An inner boiler of a combustion calorimeter can be filled precisely and with high accuracy when the inner boiler is first coarsely pre-filled with a first filling quantity which is less than the required filling, and that the quantity of water which is still lacking is determined by weighing the pre-filling and is fed in, finely metered, in particular iteratively, in several steps. A balance can be provided on which the inner boiler is placed during filling. A coarse filling device is thus combined with a metering, fine filling device, so that first the coarse filling device and then the fine filling device can be actuated, regulated by means of the balance. The fine filling device suitably delivers less water, on its first actuation, than corresponds to the quantity of water still lacking, so that the quantity of water still lacking is thereafter again determined and a quantity of water not quite corresponding to this can be added, and so on.