CAL2K Bomb Vessel

The DDS Bomb Vessel is unique in that it is the first of its kind and is packed with features.

The improved CAL2K vessel is designed to fit perfectly into each calorimeter in the CAL2K range. Various improvements are made to ensure accurate results with each determination. One of the bomb vessel's innovative design elements includes temperature sensors built into the wall of the vessel.

Small. With thermal balance.

The electronics and sensors are built inside the vessel. The vessel is placed inside the calorimeter and is "docked" in the calorimeter for supervision. The result is a faster more stable temperature reading. The vessel temperature is measured by 8 sensors. The vessel are vacuum epoxy sealed, and no adjustment or maintenance is required.

Wide Temperature Range.

The vessel can be operated over a wider temperature range (+ 10 degrees to +50 degrees Celsius) but it is advised that the vessel's starting temperature is within 12 degrees of the ambient (room) temperature.

Reduced Self-Heating

The platinum sensors are very linear over a wide range, but require excitation, which results in self-heating. The total self-heating of the electronics are a scant 45mW. This results in a 0.015°C temperature rise in 5 minutes. This is 1/1000 of a 0.5g Benzoic Acid Tablet, and it is constant, and considered during calibration.


The First of Its Kind.

A bomb vessel as unique as its features.

The CAL2K bomb vessel is the first of its kind in calorimetry. The microprocessor in the base of the vessel provides accurate results with each analysis. The complete lid assembly holds the crucible containing the sample for determination. Temperature sensors are built into the wall of the vessel for effective temperature measurement. The vessel is filled with up to 3000 Kpa of oxygen for each determination. Measuring calorific values has never been this easy.

CAL2K Oxygen Bomb Vessel | DDS Calorimeters

Small. With thermal balance.

The bomb vessel is smaller than conventional vessels, which results in a smaller heat capacity. Special attention has been given to a thermally balanced vessel design. Computer aided design (CAD) and computer simulation of heat transfer characteristics is used to achieve this.

8 Temperature Sensors.

The vessel has an oxygen volume of 0.22 liters (220ml), which allows for a 0.5g coal sample at approximately 30MJ/Kg. The temperature sensors are located cylindrical within the vessel walls at eight places for accurate temperature measurement.

Accurate results with Benzoic Acid.

The approximate temperature rise of the vessel after burning of 0.5g Benzoic Acid is 9 degrees Celsius. Practical tests have shown that up to 0.8g of Benzoic Acid can be burnt without affecting the accuracy. Oxygen starvation affects the results with higher charges. Certified Benzoic Acid Tablets.

Intelligent "SMART" Vessel.

The heart of the vessel is the intelligent microprocessor built into the base of the unit. All the information pertinent to a vessel is stored permanently inside the vessel. This includes information regarding the : vessel number, calibration, number of firings, date of last reconditioning, etc.

Compatible with all CAL2K Calorimeters.

The vessel PCB is only powered up when placed in the calorimeter. The result of the vessel memory is that any vessel can run in any calorimeter without a new calibration.

Sealed for extra protection.

The vessel memory can only be accessed from the PC. The electronics and sensors are vacuum epoxy impregnated to prevent physical damage as well as moisture from entering the electronics.

Semi-permanent firing wire.

The firing wire is semi-permanent and only needs to be replaced when the wire is burnt or damaged.


Vessel Comparison - The CAL2K Vessel & CAL3K Bayonet Vessel

The heart of the oxygen bomb calorimeter system.

CAL3K Automatic and Manual Filling Bayonet Bomb Vessels | DDS Calorimeters
CAL2K Oxygen Bomb Calorimeter Vessel

Feature CAL2K-4 CAL3K
Closing Mechanism Screw Type Bayonet Lid
Temperature Resolution 0.000'01C 0.000'0001C
Sensors 8 x Semiconductor 4 x Platinum
Temperature Range 10-40C 0-72C
Approximate Bomb Factor 1.625 1.0
Heat Capacity - 0.001C/Ws
Settling Time 4 min 2 min
PC Calibration No 4Kb
Backup PC Calibration No Yes
Benzoic Acid Sample Memory No Yes
Self-Testing Yes Yes
Power Consumption 134mW 34mW
Temperature Measurement 6 seconds 6 seconds
Calibration Memory 1 7 x 10


Read more about the CAL2K Oxygen Bomb Vessel, get maintenance tips and learn how to operate the vessel and calorimeter.

Get support for your CAL2K Oxygen Bomb Calorimeter System and Bomb Calorimeter Oxygen Vessel

Animal Feed Research

Food calories are measured in KJ/g, the same as combustible calories. However, the process is different, although the outcome is the same : KJ/g or heat, or calories. Animal feed stock relies on the animal digestion (conversion). A calorimeter burns the lot and measures the released heat. Then a calorimeter can't be used to measure feed stock?

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Coal & Coke Analysis

The coal industry is the traditional application of calorimeters because coal has a variety of properties, apart from being black. If the coal is used for steam generation then the calorific value is of paramount importance. The calorific value, short CV, is a measure of how much heat can be extracted from it.

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Explosives Analysis

Only explosives which can be ignited by heat from the calorimeter's firing circuit can be tested in the oxygen calorimeter. Then very minute/small quantities are used for analysis. The calorific value of an explosive is not very high, but the burning speed is.

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Fuel Analysis

As a general rule, volatile fuels are measured very seldom because they are very consistent. However, if the fuel absorbs water, then frequent analysis is called for. Volatile fuel such as alcohol must be prevented from evaporating during the handling process that is from weighing to ignition of the sample.

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Food & Nutrition Analysis

Here is an example of food calories from As the article says : "The method of using a combustion calorimeter to measure food calories is not frequently used today. However, after some considerations it can, and is, used today for checking the production quality of food." Let's look at the details.

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Oil Analysis

Oils are a non-volatile substance. In general they are not measured frequently because they are very consistent and uniform. Other oil properties are more important than the calorific value, such as taste or viscosity. If an oil is measured in an oxygen calorimeter, then the procedure would be the same as a solid substance.

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Simple, we at Digital Data Systems (DDS) have been making calorimeters for the last 40 years. We have a wealth of technical knowledge and calorimeter experience second to none. We are continuously improving our systems with the latest technology as it becomes available, allowing the students to work on a cost effective, easy to use...

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Waste Product Analysis

Heating energy is being dumped on our municipal landfill sites. Our landfill sites are being clogged by plastic waste, which battle to bio-degrade over time. Alternative options for managing plastic waste has been identified as mechanical recycling, cement kilns, power station and energy recovery by incineration. Having plastic on landfill sties should be the last option.

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Other DDS Calorimeter Products in the same range

E2K Oxygen Bomb Calorimeter System | DDS Calorimeters


Our entry level system, the ECO Bomb Calorimeter has an operator test time of 5 minutes per sample, with a removable screw cap vessel, semi-automatic oxygen filling, and can handle 1 sample per hour with 2 bomb vessels. This system is ideal for educational purposes in universities and laboratories that don't require the large quantity of sample throughput.

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ECO Oxygen Bomb Calorimeter System | DDS Calorimeters


The CAL2K is the top of the range when it comes to CAL2K Calorimeters. This system allows up to 10 samples per hour using 2 vessels, and stores up to 2000 results in it's memory. The operating time per test is approximately 2 minutes, making it fast and accurate.

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CAL3K-U Oxygen Bomb Calorimeter System | DDS Calorimeters


Our intermediate system is the E2K Calorimeter System, with a screw cap removable vessel, semi-automatic oxygen filling and can handle 6 samples per hour using 2 bomb vessels. This option allows more samples per hour and allows the operator to print results directly to a printer.

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