Parr Instrument 6725 - Manual (Page 61)

6725
Semi-micro Calorimeter 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.
• 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.
There Is A Problem With The Bucket Thermistor. Possible electrical open or short. This
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 1000 to 5000 ohms.
• Check connection to board.
• Check quick disconnect.
• Replace
probe.
There Is A Problem With The Jacket Thermistor. Possible electrical open or short. This
errors will result if the temperature probe response is not within the expected range.