FILLING & DE-FILLING THE OXYGEN BOMB VESSEL

The following method applies to the following oxygen bomb calorimeter systems: CAL3K-A, CAL3K-S , CAL3K-ST and CAL3K-F. The CAL3K-AP uses internal automatic oxygen filling, which does not require the manual oxygen filling station. Please refer to the automatic oxygen filling article on our online help files for more information.

For this exercise, you will need:

CAL3K Manual Oxygen Filling Station attached to an oxygen supply
CAL3K Oxygen Bomb Vessel - Complete with LID and Body
De-Filler Cap (supplied with the installation kit)

METHOD TO FILL THE BOMB VESSEL WITH OXYGEN

To start, make sure the filling station is connected to an oxygen supply and inspect that everything is working correctly. The sample should already be weighed, prepared and inserted into the bomb vessel with the firing cotton, electrodes, firing wire and crucible.
Wait for the vessel to fill to 30 bar with oxygen, this should take about 35 seconds.
To fill the vessel, place the prepared bomb vessel onto the filling station base.
Pull down the lever/handle so it locks onto the bomb vessel nozzle.
Wait for the vessel to fill to 30 bar with oxygen.
The needle on the gauge will move to indicate the vessel is filling.
The regulator will regulate the oxygen pressure to 30 Bar, so the bomb vessel will not over fill.
When filling to 30 bar, lift the lever to remove the vessel from the filling station.
The vessel is now filled with oxygen and ready for firing in the oxygen bomb calorimeter.

TO DE-FILL THE BOMB VESSEL AFTER A DETERMINATION

To de-fill the oxygen vessel, place the de-filler cap onto the vessel nozzle and press down with the palm of your hand to release the oxygen.
The oxygen is now being released from the bomb vessel. Continue until all the oxygen is released from the vessel.
Remove the de-filler cap from the bomb vessel when complete.
Check that the center electrode is free or loose by touch before opening the LID
The bomb vessel lid can now be removed and inspected.