Parr Instrument 6200 - Manual (Page 52)

53
6200
Calorimeter Operating Instruction Manual
Calculation Factors. Accesses sub-
menu, Calculation Factors which
sets a number of options for the way
the thermochemical corrections are
applied.
Acid Value is Nitric Acid Only. When set to
ON, the acid value is nitric acid only. When
set to OFF, it represents both nitric and
sulfuric acid.
Acid Multiplier. The multiplier is the normality
of the sodium carbonate used to titrate for
the acid correction. The default value of
0.0709 allows for direct entry of the acid
correction in calories. If the bomb rinsings
are titrated in order to determine the acid
correction, this multiplier is the concentration
of the base (equivalents/L) or normality used
for titration. In this case, the acid correction
is entered as milliliters of base used to titrate
the bomb rinsings.
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 product into
units of milli-equivalents. 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 thread used to ignite the sample.
If another measurement is used, the
correction factor must be entered here.
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 compensate
for the back titration that is made. To use
these calculations, set to ON and enter the
appropriate value as the offset value.
Offset Value. Entry for the value when use
offset correction is turned ON.
Fixed Hydrogen. On / Off and value entry.
Hydrogen Multiplier. This value is
associated with the net heat of calculation. It
is related to the heat of formation of water.
Dry Calculation. On / Off
Fixed Moisture. On / Off and value entry.
Units are weight %.
Moisture Multiplier. This value is associated
with the net heat calculation. It is related to
the heat of vaporization of water.
.
Thermo-
chemical
Corrections
Menu
Continued
A-9
APPENDIX A