4
Menu Descriptions
P a r r I n s t r u m e n t C o m p a n y
36
Thermochemical Corrections Menu
The Thermochemical Corrections Menu permits
three types of fixed corrections for standardization
(instrument calibration) runs, and the same three
types for determination (test) runs. Pressing the
LEFT side of each key toggles the correction ON or
OFF. Press the RIGHT side of each key to access the
specific numeric dialog box where that fixed value
can be set. Each value entered for these fixed cor-
rections is used in all preliminary reports.
When any fixed correction is set to ON, the specified
value will be used in the final reports, and the 6400
will not prompt for actual corrections to be entered.
(If all corrections are fixed, only a final report will be
generated).
When any fixed correction is set to OFF, during the
data entry reporting steps the user will be prompted
to enter an appropriate desired value which will be
used in the final report.
Further information on the corrections is
located in Chapter 7: Calculations.
Standardization Corrections
Fixed Fuse Correction:
Press this key on the LEFT
side to toggle ON or OFF the fixed fuse correction
for standardization runs. Press it on the RIGHT side
to access the Fixed Fuse numeric dialog box on
which the value can be set. An appropriate fixed
fuse value is 50 calories.
Acid Correction:
Press this key on the LEFT side
to toggle between Fixed HNO
3
, Calculated HNO
3
, Entered Total, Entered HNO
3
, and Fixed Total for
the acid correction for standardization runs. Press
it on the RIGHT side to access the Acid Correction
numeric dialog box on which the value can be set.
An appropriate Fixed HNO
3
value is 8 calories when
one-gram benzoic acid pellets are used to calibrate
the instrument.
Fixed Sulfur Correction:
Press this key on the LEFT
side to toggle ON or OFF the fixed sulfur correction
for standardization runs. Press it on the RIGHT side
to access the Fixed Sulfur numeric dialog box on
which the value can be set. When benzoic acid is
used as the calibrant, a fixed sulfur value of zero
should be used.
Determination Corrections
Fixed Fuse Correction:
Press this key on the LEFT
side to toggle ON or OFF the fixed fuse correction
for determination runs. Press it on the RIGHT side
to access the Fixed Fuse numeric dialog box on
which the value can be set. An appropriate fixed
fuse value is 50 calories.
Acid Correction:
Press this key on the LEFT side
to toggle between Fixed HNO
3
, Calculated HNO
3
,
Entered Total, Entered HNO
3
, and Fixed Total for the
acid correction for determination runs. Press it on
the RIGHT side to access the Acid Correction nu-
meric dialog box on which the value can be set.
Fixed Sulfur Correction:
Press this key on the LEFT
side to toggle ON or OFF the fixed sulfur correction
for determination runs. Press it on the RIGHT side
to access the Fixed Sulfur numeric dialog box on
which the value can be set.
Note:
When fixed corrections are turned ON,
the value in the specified field will be used
in both the preliminary and final reports.
The calorimeter will not prompt for actual
corrections. If all corrections are fixed, only
final reports will be generated. If any correc-
tion value is entered and the toggle is set to
OFF, then the preliminary report will use the
displayed fixed value, but the final report will
use the value entered when prompted during
the reporting process.
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