Parr Instrument 6400 - Manual (Page 40)

6400
Calorimeter Instruction Manual
5-8
Calibration Data and 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 11
th is still stored in the
memory and is available for viewing or
printing. Only runs that are at final status will be used in this calculation.
EE Max Std Deviation:
Displays the maximum relative standard deviation in percent that will be
permitted 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. 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 recommends 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 way to interpret test data. In its simplest form, a selected
reference sample is measured periodically and the results are plotted sequentially on a
graph. This key will define the charted value; either the heat of combustion of the
standard or the Energy Equivalent. It also defines the process sigma.
Use Bomb:
Displays the ID of the bomb currently being used in the Calorimeter and toggles through
the four possible bomb numbers.