BUCHI DuMaster D-480 - Manual (Page 177)

Operation Manual D-480 ©BÜCH Labortechnik AG
8 - Maintaining the instrument 177
Viewing calibration coefficients
Viewing calibration coefficients
Proceed as follows:
 Open the "Calibration coefficients" dialog in the operating software by selecting Calibration >
Coefficients.
 Highlight the name of a coefficient set in the listbox.
 The calibration coefficients of the coefficient set and the limits the calibration is valid within are
displayed.
Optimizing instrument condition for calibration
Note
Note that calibration only makes sense if you have previously checked and optimized the condition of
the instrument.
Why does the condition of the instrument need to be checked and optimized?
The condition of the instrument needs to be checked and optimized in order to avoid...
 ... leaks of the instrument.
 ... old tube fillings from distorting results.
Checking and optimizing the condition of the instrument
Proceed as follows:
 Check the parameter settings by selecting Options > Settings > Parameters. Correct them if
necessary. See Setting instrument parameters (on page 50).
 Replace all tube fillings.See
 Emptying and filling reaction tubes.
 Filling the drying tube (on page 234).
 Replace the ash crucible. See Replacing the ash crucible.
 Perform a leak test. See Performing a leak test (on page 242).
 Determine the blank value as a measure of gas-tightness. Perform blank value determination
during calibration measurement.See Types of blank value determination and their settings
(on page 143).
 Perform test measurements so that the instrument is stable when you subsequently perform the
calibration measurement. Measure 10 x 250 mg aspartic acid.
Performing the calibration
Target group
Personnel authorized by the customer. Successful calibration is only possible if the user is familiar
with the operating instructions and the analyzer.
Note
Perform calibration carefully as perfect calibration is a condition for correct measuring results.
Calibration must comprise the complete working range.