Parr Instrument 6200 - Manual (Page 35)

Maintenance & Troubleshooting
6200 9
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9
Maintenance & Troubleshooting
Oxygen Bomb
Under normal usage the 1108P Parr Oxygen Com-
bustion Vessel will give long service if handled with
reasonable care. However, the user must remember
these bombs are continually subjected to high tem-
peratures 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 re-
placed before they fail. It is recommended the 1108P
Oxygen Combustion Vessel have O-rings and valve
seats replaced after 6 months, 500 firings 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 Manual 418M
supplied as a part of this manual. This 1108P Oxygen
Combustion Vessel is the only part of the calorimeter
system that requires routine maintenance. All other
problems will require diagnosis and parts replace-
ment.
Jacket Temperature Troubleshooting
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 read-
ing 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.
Caution!
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 75 ºC. 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 prob-
lem with the calorimeter controller, A1279DD2, and
Parr Customer Service should be contacted.
Fuses
The replacement of protective fuses for the 6200
Calorimeter should be performed by qualified per-
sonnel.
All fuses except Parr part # 139E23 are located on
the A2140E I/O board located inside the instrument.
Please contact Parr Customer Service for instructions
on accessing the I/O board.
Note: Check the labels on the instrument for
correct fuse rating.
Part No. Description Type Ratings
139E23 Lines Protective
Fuses Fast-Acting 15 Amps,
250Vac
1641E2 Heater Fuse (F2) Fast-Acting 2.5 Amps,
250Vac
1641E Pump Fuse (F1) Fast-Acting 1 Amp,
250VAC
6200 Calorimeter 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 con-
tains errors that are not necessarily self-evident and
suggestions for correcting the error condition.
Start Button Dim:
The Start button will be dim (not lit) when the calo-
rimeter is not ready to begin a test. 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 15 minutes