Isothermal vs Isoperibol

The difference between the CAL2K Isothermal "dry" static jacket system and an Isoperibol System

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 energy released during a determination. A microprocessor built into the vessel making the calibration independent of the calorimeter.

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
  • Vessels can be used in any calorimeter without re-calibration

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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