Parr Instrument 6400 - Manual (Page 29)

6400
Calorimeter Instruction Manual
4-10
continues to circulate from the closed water system through the jacket
surrounding the bucket.
2. The oxygen filling valve closes and the pressure in the filling line is vented. The
automatic check valve at the top of the bomb closes and isolates the bomb from
the oxygen filling line.
3. The controller monitors the operating temperature until it confirms that the initial
equilibrium has been established.
Bomb Firing
Once the initial equilibrium is confirmed, the controller initiates the firing sequence.
There are no changes to the circulation pattern, as shown in Figure 7, from the pre-
period through the bomb firing and post-period. A warning of short beeps is sounded
indicating the bomb is about to be fired.
Post-Period
A minimal temperature rise will confirm that the sample has ignited. After this verification,
the post-period begins. See Figure 7.
1. The controller monitors the temperature rise and determines the final temperature
rise by either the dynamic or equilibrium criteria as established by the user.
2. Once the final temperature rise is determined, it is recorded with the test results.