Parr Instrument 6400 - Manual (Page 72)

6400
Calorimeter Instruction Manual
10-3
Jacket Temperature Troubleshooting
The jacket temperature is monitored with the use of a thermistor installed in the
A1448DD temperature control assembly. This assembly is heated by a heater cartridge,
A1459DD. In the Diagnostics Menu, select Instrument Monitor. If the heater PID is ON
and reading 100%, yet the jacket is at ambient temperature, check the following possible
causes.
If the heater PID is OFF, the heater and pump must be turned on in the Calorimeter
Operation screen to perform the troubleshooting steps.
WARNING: Turn off the power to the calorimeter prior to attempting to reset the
thermostat. The temperature control assembly can become very hot. Use
caution when servicing this area of the calorimeter.
If line voltage (115V or 230V) is present across the heater cartridge connection, check
the resistance across the heater cartridge. Approximately 70 ohms will be seen with a
115V calorimeter. Approximately 140 ohms will be seen with a 230V calorimeter. If the
resistance is not correct the heater may have failed.
If the voltage is not present, then examine the 2040E thermostat reset button. If the
reset button extrudes this means that the temperature in the temperature control
assembly has exceeded 75ºC. Confirm that water is flowing through the system, turn off
the power and then reset the switch by depressing the button. If the thermostat
continues to trip even though water is flowing through the system, refer to the error code
“There Is A Problem With The Jacket Thermistor” for further troubleshooting.
If there is no voltage present, and the reset button on the thermostat is not tripped, refer
to the error code “There Is A Problem With The Jacket Thermistor” for further
troubleshooting. There may also be a problem with the calorimeter controller, A1250DD,
and Parr service should be contacted.
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, too long 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