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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