Parr Instrument 6400, Operating Instructions Manual

Page: 78 / 110

11
Troubleshooting
P a r r I n s t r u m e n t C o m p a n y
76
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.
Start and Pretest buttons dim.
The Start and Pretest buttons will be dim (not lit)
when the calorimeter is not ready to begin a test or
pretest. When the heater and pump are first turned
on the jacket temperature will be less than 30 °C.
Once the jacket temperature reaches 30 °C ± .5 °C it
will be another 10 minutes before the Start and Pre-
test buttons light up. This is to make sure that all of
the jacket water is stable at the correct temperature.
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
• Bomb not filled with oxygen
• A bomb 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 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
A Postperiod Timeout has Occurred
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
• Unstable room temperature
There Is A Problem With The Bucket Thermistor. Possible
electrical open. These errors will result if the tem-
perature probe response is not within the expected
range. Probe substitution can be useful in determin-
ing the cause of the problem (probe or electronics).
The valid working range of the probe resistance is
1000 to 5000 ohms
• 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 1000 to 5000 ohms
• 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.