Parr Instrument 6300 - Manual (Page 59)

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lated 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 proceed-
ing with testing. 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.
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 recom-
mends 500 firings for this service interval. (Parts may
need to be replaced on a more frequent basis depending
upon the nature of the sample).
Control Chart Parameters:
A control chart is a graphical tool which can assist the
user in determining whether or not their process is in
control. Many standard methods will dictate that a ref-
erence 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 problems.
Charted Value: • Toggles the charted value be-
tween the HOC Standard (Heat Of Combus-
tion of Standard) and Energy Equivalent.
Process Sigma: • In relation to calorimetry, sigma
is used as the classifi cation of the instrument.
The higher the process sigma the higher the
limits for acceptable values for precision
control.
The 6300 is a .1 Process Sigma calorimeter.
Temp. Rise High Warning: • Sets a limit for the tem-
perature rise during a test. If the temperature
rise exceeds the limit the user will be warned.
Temp. Rise Low Warning: • Sets a lower limit warn-
ing for the temperature rise during a test. If the
temperature rise is lower than this setting 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:
Leads to sub-menu, Bomb 1. 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.
Note:
For rapid turn around between tests, the user may wish to
use an extra head. Each head should be assigned a bomb
ID. On the Data Entry Controls Menu, set the Prompt for
Bomb ID to “ON”.
The following four values are displayed for the Bomb #
shown in the title on top of the screen.
Bomb EE Value. • Displays the calculated EE
value.
# Runs, EE Val.
• Displays how many runs have
been used to determine the EE value.
Rel. Std. Dev.
• Displays the relative standard de-
viation for the series of tests used to determine
the current EE value in percent of the EE value.