Scientific Analytical Calorimeter Solutions

Air Cooler

The following information applies to the : CAL3K-AP , CAL3K-A , CAL3K-F

The cooler 3K-2 can be controlled from the CAL3K or via the USB port at the rear. The Control from the CAL3K works as follows:

  1. The Cooler parameters are entered in the CAL3K
  2. When the vessel is inserted in the well these parameters are entered in the Vessel
  3. When the vessel is inserted in the cooler then these parameters are loaded in to the cooler
  4. The cooler checks them, and if correct, executes them

The cooler indicates this on its display: COOLING FROM VESSEL

Another way to change the cooling parameters is to connect the cooler to a PC via the USB interface and change the parameters.

The cooler requires that the room (ambient) temperature is about 8 degree LOWER than the Cooler ‘ready’ temperature to obtain a 7 minute cooling cycle. Otherwise the cooling time gets longer. This leads to a situation where the CAL3K is faster than the cooling. Of course, using multiple cooler helps.

The cooler has two operating modes:

Fixed cooling target

The vessel is cooled to the ‘READY TEMPERATURE’ and then the fan stops. This insures a fixed vessel starting temperature.

CAL3K Oxygen Bomb Calorimeter System - Air Cooler | DDS Calorimeters

Variable cooling target

The vessel is cooled to a temperature which is the sum of the Ambient and a constant addition. This insures constant cooling times


Ready Temperature Default=32°C
Ambient addition temperature Default=8°C
Maximum Ready temperature Default=40°C
Cooler system definition: 1 = Ambient Addition, Default=OFF
2 = Enable, Default=ON


If set the cooling parameters from the vessel are used

If reset the cooling parameters from the cooler are used


If set the cooler target temperature = Ambient + Addition (limit =Maximum Ready Temp)

If reset the cooler target temperature = Ready temperature


The cooling cycle depends on the room temperature: A warmer room temperature results in longer cooling times. The Cooler ‘READY’ time can be adjusted to suit your operating conditions, but an average of 7 minutes per cooling cycle is the design target.

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The cooler is the slowest system component. We have optimised it as best we can; but it is slow! It cools a vessel down by blowing air at it. Not a very efficient way, BUT very resource friendly and economical.

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The following exercise applies to the following CAL3K Calorimeters in the DDS Calorimeters range : CAL3K-AP (without manual oxygen filling station), CAL3K-A, CAL3K-U and CAL3K-F. For this exercise we used the CAL3K-A Oxygen Bomb Calorimeter System.

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