Parr Instrument 6200 - Manual (Page 41)

Menu Operating Instructions
6200 A
w w w . p a r r i n s t . c o m 39
Compare Settings With Factory Defaults: This button
will bring up a screen that will show the differences
in the current settings of the calorimeter with the
factory defaults.
Feature Key: Unique Feature Keys obtained from
Parr allow the user to access capabilities on the
instrument such as bar code interfacing or remote
operation of the calorimeter.
Bomb Type Select: This key toggles through the
different bomb models available for the calorimeter.
When the user chooses a bomb, the instrument
must be re-booted to load the correct version of the
software.
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 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
11th is still stored in the memory and is available for
view or printing.
EE Max Std Deviation: Displays the maximum
relative standard deviation in percent that will be
permitted for any EE value calculated by the calo-
rimeter 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 0.17 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.
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. This interval may
be more frequent depending upon the nature of the
sample.
Control Chart Parameters: A control chart is a
graphical tool which can assist the user in deter-
mining 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 distri-
bution within established limits, systematic trends
or patterns in the data plots may also be an early
warning of problems.
Control Chart Parameters