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Isothermal vs Isoperibol

Refer to ISO 1928.

Isothermal includes both static jacket and isoperibol.

Isoperibol calorimeters control the temperature of the surrounding water jacket so that it is at a constant temperature. The static jacket has a thermal capacity such that the temperature of the surrounds remains nearly constant without active control. The variation in the static jacket is measured and compensated for.

Bomb Vessel Construction

  • DDS (Static Jacket) - the vessel has a stainless steel body with an aluminium sleeve pressed over it.
  • Isoperibol - stainless steel

  • Temperature measurement of surrounds:
  • DDS (static jacket) - the ambient box containing the polystyrene (static jacket) is monitored throughout the determination. Isoperibol - the jacket is water maintained at a constant temperature.

  • Temperature measurement of energy:
  • DDS (static jacket) - sensors placed between the stainless steel body and the sleeve measure the temperature (energy released) during a determination. The microprocessor in the vessel linearises the platinum sensor readings.
  • Isoperibol - The vessel is placed in a bucket of water and then the temperature of the water in the bucket is measured.

  • Advantages of the DDS Static Jacket Bomb Calorimeter System
    • Fast
    • No water inside the calorimeter
    • No water control valves
    • Can use multiple vessels per calorimeter
    • Aluminium sleeve is the heatsink instead of water jacket
    • No need to control the water level

    Want to know more about the different calorimetry methods?

    View our complete overview of the different methods used in calorimetry.

    Bomb Calorimetry Methods

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