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COMBUSTION OF NON-FLAMMABLES
The high pressure oxygen on the bomb calorimeter system can assist with the burning of combustibles that are not normally flammable, which is needed for some procedures where substances don’ t combust completely.
A bomb calorimeter only allows heat to be exchanged. Such a system is called a closed system. An example of a closed system is a balloon being heated so the gas inside expands. No matter is exchanged, only heat.
PRECAUTIONS WHEN WORKING WITH CALORIMETERS
There is an explosion risk involved with operating an oxygen bomb calorimeter system when highly combustible samples are being analyzed. Laboratory personnel should adhere to safety instructions laid out in the instruction manual and maintain parts on a regular basis. Seals an o-rings should be inspected before every firing.
THE PROCESS OF DETERMINATION
An empty crucible is placed inside the balance( crucibles are supplied in the installation kit when ordering a complete system). The balance is then tared and the sample is placed inside the crucible to read the exact weight of the sample. The weight of the sample is then entered into the calorimeter( automatically or manually).
The crucible containing the sample is then placed into the complete lid assembly which should have the firing cotton attached to the firing wire, ready for firing. The cotton thread is attached to the firing wire that is attached to two electrodes, which will ignite the sample during ignition.
The complete lid assembly is screwed / attached to the bomb vessel body where it is sealed. This is done by hand to ensure the lid is not over tightended. The vessel is then charged with 30 bar of oxygen( automatically or manually). The prepared vessel is then lowered into the DDS Calorimeter.
The calorimeter lid is closed and the determination can begin. The DDS Calorimeters range requires little to no attention from the operator during the determination process, making it easy to use and operator friendly.
high pressure oxygen use precautions
WARNING: Use caution when working with high pressure oxygen. Ensure all safety precautions are taken when installing your oxygen filling station and that the vessel is filled correctly to 30 bar. Make sure the oxygen supply is secure and that no leaks occure when filling the bomb vessel. If any leaks are detected, consult your agent, or contact us for assistance on correctly setting up the filling station and its components. High Pressure Oxygen can be dangerous if not handled correctly. Always make sure that the vessel is sealed correctly before filling with oxygen( refer to installation guide or maintenance manual for details). Never attempt to open a bomb vessel before de-filling it( removing all the oxygen from the vessel).
DDS Calorimeters | Feb / March 2017 Issue www. ddscalorimeters. com