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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.

Our CAL3K range are the latest models that use the DDS Static Jacket Bomb Calorimeter System

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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