Maintenance & Troubleshooting
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A Misfire Condition Has Been Detected.
This error will be generated in the event the total
temperature rise fails to exceed 0.5 °C after the first
minute of the post-period. Possible causes for this
error are listed below:
• Fuse wire not intact, too long or improperly
formed
• Poor bucket stirring
• Vessel not filled with oxygen
• A vessel leak
• Breakdown of the insulator and O-ring on the
insulated electrode assembly
A Preperiod Timeout Has Occurred.
The calorimeter has failed to establish an accept-
able initial temperature, prior to firing the oxygen
combustion vessel, within the time allowed. Pos-
sible causes for this error are listed below:
• A vessel leak
• Poor bucket stirring
• Lid not tight
A Postperiod Timeout has Occurred
The calorimeter has failed to establish an accept-
able final temperature within the time allowed.
Possible causes for this error are listed below:
• A vessel leak
• Poor bucket stirring
• Unstable room temperature
There Is A Problem With The Bucket Thermistor.
Possible electrical open. These errors will result if
the temperature probe response is not within the
expected range. Probe substitution can be useful
in determining the cause of the problem (probe or
electronics). The valid working range of the probe
resistance is 1 kΩ to 5 kΩ.
• Check connection to the board
• Check quick disconnect
• Room temperature is below 10 °C (50 °F)
• Replace probe
• Replace board
There Is A Problem With The Jacket Thermistor.
Possible electrical open. These errors will result if
the temperature probe response is not within the
expected range. Probe substitution can be useful
in determining the cause of the problem (probe or
electronics). The valid working range of the probe
resistance is 1 kΩ to 5 kΩ.
• Check connection to the board
• Room temperature is below 10 °C (50 °F)
• Replace probe
• Replace board
A/D Initialization Failed.
Shortly after power is applied to the calorimeter
controller and the operating system has started, the
CPU attempts to read the unique I/O board calibra-
tion information from the I/O board. If the I/O board
is not connected to the CPU, or the information on
the board is not valid, this error will be issued.
Bomb ID – Has Been Fired – Times Which Exceeds the
Bomb Service Interval.
The calorimeter controller keeps track of how
many times the vessel has been fired. When this
count exceeds a preset limit (usually 500) this mes-
sage will be issued each time the vessel is used
for a test. Perform vessel maintenance and reset
counter on Calibration Data and Control page for
appropriate bomb number.
You Have Exceeded the Run Data File Limit (1000 Files).
The memory set aside for test runs has been filled.
Use the memory management techniques to clear
out non-current tests.
Bomb EE Standard Deviation Warning.
The relative standard deviation for the calibration
runs in memory for the indicated combustion
vessel exceeds the preset limit.
Sample Weight Warning.
The entered sample mass exceeds the value
entered via the Sample Weight Warning Above key
on the Data Entry Controls page. This warning
threshold is normally 2 g.
The Lid has Failed to Lock or is not Closed Properly.
This error will be reported when the controller
fails to detect continuity through the combustion
vessel ignition circuit. The most probable cause
will be either a poor electrical connection between
the vessel’s internal electrodes and the fuse wire,
carbon build up on the electrodes or a fuse wire
that has burned out. This will also occur if the lid is
not down before the pretest or test is initiated.
Could Not Cool the Bomb Successfully.
The calorimeter has failed to establish the desired cool
down temperature within the time allowed. Check the
flow of cooling water to see that it is not restricted. It
may also be that the water is not cold enough.
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