Parr Instrument 6100 - Manual (Page 38)

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Menu Operating Instructions
P a r r I n s t r u m e n t C o m p a n y 36
Bomb Service Interval: Displays the maximum
number of times a bomb may be fired before it is
flagged as due for service and accesses the sub-
menu on which this limit is set. Parr recommends 500
firings for this service interval.
Control Chart Parameters: A control chart is a graphi-
cal tool which can assist the user in determining
whether or not their process is in control. Many
standard methods will dictate that a reference sample
be measured periodically and the results plotted on
a graph. Limits for acceptable values are defined and
the process is assumed to be in control as long as
the results stay within these limits. Since results are
expected to scatter with a normal distribution within
established limits, systematic trends or patterns in
the data plots may also be an early warning of prob-
lems.
Charted Value: Toggles the charted value be-
tween the HOC Standard (Heat Of Combustion
of Standard) and Energy Equivalent.
Process Sigma: In relation to calorimetry, sig-
ma is used as the classification of the instru-
ment. The higher the process sigma the higher
the limits for acceptable values for precision
control.
Note: The 6100 is a .2 Process Sigma calorimeter.
Temp. Rise High Warning: Sets a limit for the
temperature rise during a test. If the tempera-
ture rise exceeds the limit the user will be
warned.
Temp. Rise Low Warning: Sets a lower limit
warning for the temperature rise during a test.
If the temperature rise is lower than this set-
ting the user will be warned.
Use Bomb: Displays the bomb number of the bomb
currently installed in the calorimeter and toggles
through the four possible bomb numbers. The left
and right arrow keys are used to toggle through
the bomb identification numbers available for each
bomb.
Bomb 1 - Bomb 4: Leads to sub-menus for Bomb
1 - Bomb 4. Displays standardization information
for bomb and bucket combinations. While only one
bomb and bucket is installed in the calorimeter at a
time, a spare may be used for servicing and for more
rapid turn-around. The respective EE values for each
bomb can be stored in memory.
User Function Setup: This key leads to sub menus
that support the configuration of five factory/user
definable function keys. The function keys are acces-
sible from the Diagnostics page.
Cold Restart: This is essentially the same as cycling
power on the unit. All valid test data will be retained
during this cold restart procedure.
Calibration and Data Controls Menu
Calibration Run Limit: Displays the maximum
number of runs that will be included in determining
the EE value of a bomb and bucket combination and
accesses the sub-menu on which this limit is set.
Most test methods suggest 10 tests. Tests in excess
of the most recent ones used are still available but
are not used in the calculation of the EE value. For
example if 11 standardization tests have been run, the
calorimeter will only use the most recent 10. The 11th
is still stored in the memory and is available for view
or printing.
EE Max Standard Deviation: Displays the maximum
relative standard deviation in percent that will be per-
mitted for any EE value calculated by the calorimeter
and accesses the sub-menu on which this limit is set.
If this value is exceeded, the user will be warned to
take corrective action before proceeding with testing.
This calorimeter is capable of achieving a value of
0.33 or better for 10 tests. A setting of zero disables
this check.
Heat of Combustion of Standard: Displays the heat
of combustion in calories per gram for the material
used to standardize the calorimeter and accesses the
sub-menu on which this value is set. For benzoic acid,
this value is 6318.4 calories per gram.