Parr Instrument 6755 - Manual (Page 41)

Troubleshooting
6755 10
w w w . p a r r i n s t . c o m 39
C
HAPTER
10
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 fol-
lowing list contains errors that are not necessarily self-evident and suggestions for correcting the
error condition.
A Misfi re Condition Has Been Detected. This error will be generated in the event the total tem-
perature change fails to exceed 0.05 ºC after the fi rst minute of the post-period. Note that if your
reaction is endothermic that you may have to change the L2 parameter to -1. This is found in the
Main Menu -> Diagnostics -> Calorimetry Parameter -> Tolerance (L) Parameters.
A Preperiod Timeout Has Occurred. The calorimeter has failed to establish an acceptable initial
temperature within the time allowed. Possible causes for this error are listed below:
• A cell leak.
• Poor bucket stirring.
• Lid not tight.
• Initial Dewar temperature outside the acceptable range.
The Current Run Has Aborted Due To Timeout. The calorimeter has failed to establish an accept-
able fi nal temperature within the time allowed. Possible causes for this error are listed below:
• A cell leak.
• Poor bucket stirring.
There Is A Problem With The Bucket Thermistor. Possible electrical open or short. This error 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.
• Replace probe.
• Temperature below 10 ºC
There Is A Problem With The Jacket Thermistor. Possible electrical open or short. This error 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.
• Replace probe.
• Check jacket temperature source on Operating Controls page.
You Have Exceeded The Run Data File Limit (1000 Files). The memory set aside for test runs has
been fi lled. Use the memory management techniques to clear out non-current tests.