Oxygen Bomb Calorimeter

An oxygen bomb calorimeter is a testing instrument used to measure the combustion heat of a sample. It determines the calorific value (energy content) of fuels, food, chemicals, and other materials by measuring the heat released during combustion.

The automatic oxygen bomb calorimeter ATC 300A mainly consists of an oxygen bomb, an inner cylinder, an outer cylinder, a stirrer, a thermometer, and an ignition device. The instrument works by filling the inner and outer cylinders with water and placing a certain amount of combustible material inside a sealed bomb (oxygen bomb) filled with high-pressure pure oxygen for complete combustion. The heat released from combustion is transferred through the oxygen bomb to the water in the inner and outer cylinders. By measuring the change in water temperature, the calorific value of the combustible material is calculated.

It can test various solid and liquid samples, such as coal, petroleum, food, biomass, chemicals, and waste materials, to determine their calorific value. Depending on the material type, different sample containers or combustion aids may be required.

Equipped with automatic oxygen bomb lifting, automatic oxygen bomb identification, automatic ignition, automatic oxygen filling and venting, automatic quantitative inner cylinder water control, and automatic inner and outer cylinder water filling and drainage, achieving high-precision and highly efficient automated operation. • Unique ignition wire detection technology intelligently recognizes the ignition wire status, ensuring the experiment runs smoothly. Additionally, the short-circuit protection mechanism for the ignition circuit ensures experimental safety. • Utilizes a semiconductor cooling water circulation system, which monitors and adjusts water temperature in real time, achieving an outer cylinder temperature control accuracy of ±0.03°C. Compared to traditional external thermostatic water tanks, it occupies less space, consumes less power, and provides more accurate heat capacity. • Automatically corrects ignition wire combustion heat value, offering calibration calculations for high and low calorific values. Additionally, the instrument supports external printer interfaces, automatic data input from analytical balances, historical record queries, and other auxiliary functions.

Currently, we offer the ATC 300A model. However, we can provide customized instruments based on your requirements to meet the calorific value testing needs of energetic materials and other special samples.

Step 1: Weigh the sample – Clean and dry the oxygen bomb and crucible in advance, then use an analytical balance to weigh the sample. Step 2: Connect the ignition wire/ignition cotton – Place the sample in the crucible and connect the ignition wire or ignition cotton. Step 3: Install and secure the oxygen bomb – Inject 10 mL of distilled water into the oxygen bomb and tighten the oxygen bomb cover. After RFID automatically identifies the oxygen bomb, place it at the charging port. Step 4: Set parameters – Enter the experiment name, sample name, and sample mass on the touchscreen, then click the “Start” button. The ATC 300A will automatically conduct the experiment. Step 5: End of experiment – Once the experiment is complete, the operator confirms the experimental results, removes the oxygen bomb, and cleans and dries it.

The working temperature range of the oxygen bomb calorimeter is 15°C to 30°C to ensure accurate measurement. The actual combustion temperature inside the oxygen bomb can reach up to 2000°C, depending on the type of fuel.

• The validity period for heat capacity calibration is three months, but recalibration should be performed immediately in the following situations: The calorimeter has been significantly moved during normal use. Major components of the oxygen bomb have been replaced, such as the bomb cover or connection ring. The thermometer of the calorimeter has been replaced. When measuring calorific value, the actual water temperature in the inner cylinder differs by more than 5°C from the average inner cylinder water temperature during heat capacity calibration. The calorimeter has undergone major repairs and has been completely refilled with water.

(1) Before starting each experiment, check whether the water level is within the upper and lower limits. (2) Ensure that the oxygen bomb cover is tightly secured to prevent it from popping open during charging. (3) After each experiment, ensure that the sample chamber is clean and remove any residual sample material promptly. (4) When the instrument is not in use, make sure to turn off the power.