Operation
4
24
Pre-Period
At the completion of the fill sequence,
the pre-period begins.
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 combustion
vessel closes and isolates the ves-
sel from the oxygen filling line.
3. The controller monitors the oper-
ating temperature until it confirms
that the initial equilibrium has
been established.
Oxygen Combustion Vessel Firing
Once the initial equilibrium is con-
firmed, the controller initiates the
firing sequence. There are no changes
to the circulation pattern, as shown
in Figure 4-4, from the pre-period
through the combustion vessel firing
and post-period. A warning of short
beeps is sounded indicating the com-
bustion vessel is about to be fired.
Post-Period
A minimal temperature rise will confirm that the sample has ignited. After this verification, the post-peri-
od begins. See Figure 4-4.
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.
Figure 4-3: Pre-Period/Post-Period Flow Diagram
A1589DD
RINSE
TANK
CLOSED
OPEN
WATER TANK
PUMP
TEMP
CONTROL
WATER
CHILLER
VESSEL
WASH
VESSEL
SEAL
VESSEL
FILL
VESSEL
EXHAUST
COLD
WATER
WATER
FILL
WATER
DRAIN
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