Parr Instrument 6772 - Manual (Page 59)

6772
Calorimetric Thermometer Instruction Manual
10-1
TROUBLESHOOTING
Error List
The calorimeter will run a number of diagnostic checks upon itself and will advise the
operator if it detects any error conditions. Most of these errors and reports will be self-
explanatory. The following list contains errors that are not necessarily self-evident and
suggestions for correcting the error condition.
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 or improperly formed
• Breakdown of the insulator and O-ring on the insulated electrode assembly
• Bomb not filled with oxygen
• A bomb leak.
• Poor bucket stirring
• Ignition lead wires have broken internal strands
A Preperiod Timeout Has Occurred. The calorimeter has failed to establish an acceptable
initial temperature, prior to firing the bomb, within the time allowed. Possible causes for this
error are listed below:
• A bomb leak
• Poor bucket stirring
• Lid not tight
• Initial bucket temperature outside the acceptable range (1-2 deg C below the jacket
setpoint)
The Current Run Has Aborted Due To Timeout. The calorimeter has failed to establish an
acceptable final temperature within the time allowed. Possible causes for this error are listed
below:
• A bomb leak
• Poor bucket stirring
• Initial bucket temperature outside the acceptable range (1-2 deg C below jacket
temperature)
There Is A Problem With The Bucket Thermistor. Possible electrical open.
• Check connection to board.
• Check quick disconnect.
• Replace
probe.
There Is A Problem With The Jacket Thermistor. Possible electrical open or short. These
errors will result if the temperature probe response is not within the expected range. Probe