Parr Instrument 6400 - Manual (Page 44)

6400
Calorimeter Instruction Manual
5-12
Fixed Acid Correction:
Press this key on the LEFT side to toggle ON or OFF the fixed acid correction for
determination runs. Press it on the RIGHT side to access the Fixed Acid numeric 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
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.
Calculate Net Heat of Combustion:
Toggles ON or OFF the calculations for the net heat of combustion for materials with
significant hydrogen content. When set to ON, the 6400 will prompt for entry of the
hydrogen content during the reporting data entry step.
Calculation Factors:
Accesses the Calculation Factors sub-menu, which provides for setting a number of options
for the way the thermochemical corrections are applied.
Calculation Factors Menu
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:
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 correction 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 concentration 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.