A new high-precision modification of the Setaram heat-flow calorimeter operating at temperatures up to 1300 K has been designed and built. Particular attention was paid in constructing a calorimetric detector providing integration of the major part of heat flux from the surface of the crucible in which a reaction takes place. The calibration parameter of the calorimeter is reproducible within ±1% in the whole volume of the working crucible. The calorimeter can be used for accurate measurements of enthalpy changes as small as 3 J.
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