Parr Instrument 6200 - Manual (Page 40)

41
6200
Calorimeter Operating Instruction Manual
Under normal usage the 1108 Parr
Oxygen Bomb will give long service if
handled with reasonable care.
However, the user must remember
these bombs are continually subjected
to high temperatures and pressures
that apply heavy stresses to the
sealing mechanism. The mechanical
condition of the bomb must therefore
be watched carefully and any signs of
weakness or deterioration should be
replaced before they fail. It is
recommended the 1108 Oxygen
Combustion Bomb have O-rings
and valve seats replaced after 6 months or
500 firings which ever comes first or at more
frequent intervals if the bomb has been
subject to heavy usage or if it shows any
evidence of damage. Detailed information
can be found in Bulletin 205M supplied as a
part of this manual. This 1108 Oxygen
Combustion Bomb is the only part of the
calorimeter system that requires routine
maintenance. All other problems will
require diagnosis and parts replacement.
The jacket temperature is
monitored with the use of a
thermistor installed in the
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,
A1279DD, and Parr service should be
contacted.
9 MAINTENANCE & TROUBLESHOOTING
Oxygen
Bomb
Jacket
Temperature
Troubleshooting
9-1