Parr Instrument 6400 - Manual (Page 26)

3
Operation
P a r r I n s t r u m e n t C o m p a n y 24
Pre-Period
At the completion of the fill sequence, the pre-period begins.
Figure 3-4
Pre-Period/Post-Period Flow Diagram
1. The water fill solenoid valve closes and isolates the water in the bucket from the rest of the system.
Water within this bucket is circulated by the stirrer. Water 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.