Scientific Analytical Calorimeter Solutions


The calibration of a vessel is required before an unknown sample determination.

After the calibration the data are recorded to the vessel number. The calibration data consist of the heat capacity (Bomb Factor) and other data.

The Heat capacity is a measurement which describes the amount of energy (heat) needed to raise the vessel temperature by 1 degree. It is measured in Kj/c.

In simple terms: The heat capacity (or Bomb Factor, BF) is calculated during the calibration and then it is applied to the unknown samples.

This is not the complete picture: Many more variables are attached to the BF during a calibration, and all this is saved per vessel and operating mode.


The following is an approximation of the heat capacity:

  • 0.5g of Benzoic Acid (BA) releases 0.5g*26.454Kj/g = 13.227Kj
  • This results in approx. 12.6C temperature Rise.
  • Therefore: The heat capacity is 13.227Kj / 12.6C = approx. 1.05 Kj/C

The above calculation is performed by the calorimeter to 6 decimal places. It is then recorded to the vessel number (and mode, if applicable).

The user is not concerned with the BF. The heat capacity (BF) changes with the weight and the vessel constitution.


The calibration of the CAL3K is a process in which a substance (Benzoic Acid, BA) of known calorific value is burned so that future burning of unknown substances can be compared to it. In other words the calibration records all the system variables such as temperature rise and heat loss in memory. All this data is called a calibration field. The calibrations are stored in the vessel.

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To perform a standard calibration using Benzoic Acid Tablets you will need : A working oxygen bomb calorimeter system connected to a power source, A CAL3K Manual Oxygen Filing Station connected to an oxygen supply (not needed when using the CAL3K-AP Calorimeter)...

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The CAL3K system uses two calibrations: Keyboard calibration, in real time, one sample, average with last ‘n’ calibrations, PC calibration, in retrospect, multiple samples. The PC calibration is called ‘IntelCal’ because of its complexity and system effectiveness.

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