Parr Instrument 6300 - Manual (Page 62)

A
M
ENU
O
PERATING
I
NSTRUCTIONS
P a r r I n s t r u m e n t C o m p a n y 62
T
HERMOCHEMICAL
C
ALCULATIONS
M
ENU
(C
ONTINUED
)
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 numer-
ic 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 correction 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.
Calculation Factors:
Accesses the Calculation Factors sub-menu, which
provides for setting a number of options for the way the
thermochemical corrections are applied.
Net Heat/Dry Factors:
Accesses the Net Heat/Dry Factors sub-menu, which
provides for setting the net heat of combustion and Dry
Factors Thermochemical Corrections.
C
ALCULATION
F
ACTORS
M
ENU
Nitric Acid Factor:
Ratio of the nitric acid correction when the released
energy corresponds to 6318 calories. The default is 1.58
calories per 1000 calories of released energy.
Acid Multiplier:
This multiplier is the normality of the sodium carbonate
used during the acid correction titration. The default
value of 0.0709 allows for direct entry of the acid cor-
rection in calories. If the bomb rinses are titrated in
order to determine the acid correction, press this key to
display the Acid Multiplier numeric dialog box, where
you can change the multiplier to represent the concen-
tration of the base (equivalents/L) or normality used
for titration. If this is the case, the acid correction is
entered as milliliters of base used to titrate the bomb
rinses.
Sulfur Value is Percent:
When set to ON, the sulfur value is being entered as
weight percent sulfur. If another system is to be used,
this must be turned OFF and the sulfur multiplier set
accordingly.
Sulfur Multiplier:
Values entered by the user to be used for the sulfur
correction are multiplied by this value to get the prod-
uct into units of milliequivalents. The default number
(0.6238) requires that the sulfur value be entered in
weight percent.
Fuse Multiplier:
The fuse corrections represent the number of calories
liberated by the burning fuse wire used to ignite the
sample. If another measurement is used, the correction
factor must be entered here. Press this key to access
the Fuse Multiplier numeric dialog box and enter this
multiplier value.
Use Offset Correction (ISO):
The thermochemical calculations used for treatment of
nitric acid and sulfuric acid corrections in the ISO and
B. S. methods require an offset correction to compen-
sate for the back titration that is made. To use these
calculations, toggle this to ON and enter the appropriate
value as the offset value.
Offset Value:
The value used when Offset Correction is turned ON.
Press this key to access the Offset Value numeric dialog
box and change its value.