Parr Instrument 6725 - Manual (Page 38)

6725
Semi-micro Calorimeter Instruction Manual
5-11
Calculation Factors:
Accesses the Calculation Factors sub-menu, which provides for setting a number
of options for the way the thermochemical corrections are applied.
Determination Correction
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
Acid Correction:
Displays both the ON/OFF of the fixed acid corrections for standardization runs and the
value of the correction. This key toggles the options for treatment of the acid correction
and accesses a submenu on which the value is set. An appropriate fixed HNO3 value is
10 calories when one-gram benzoic acid pellets are used to calibrate the instrument.
Options for the Acid Correction:
Fixed HNO
3
Calculated HNO
3
Entered Total
Entered HNO
3
Fixed Total
These options are discussed further in Section 6 - Calculations.
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 Calorimetric Thermometer 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.
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.