4 Description of function
K-375 / K-376 / K-377
Operation Manual, Version E
38
4.6 Different methods
BUCHI standard methods are stored in the instrument. All BUCHI methods are “read only“, but it is
possible to copy and save them under a different name as an editable customer method.
All methods are listed in alphabetical order, customer methods are first, followed by the “read only”
BUCHI methods (marked with a small yellow lock).
Fig. 4.7: Methods screen
4.7 Blank values
The K-375 differentiates between blanks and control blanks. Blanks are performed to correct minimal
contamination of chemicals on sample determination (sample and reference substance).
Control blanks are performed to check the determination process for cross contaminations and are
not used for calculation.
The determination and the definition of blank values is described in chapter 6 Operation.
4 7 1 Blanks
It is recommended to run blank values with exactly the same method as the subsequent samples.
The blank values may vary, depending on the receiver solution (e.g. concentration of the boric acid,
amount of indicator added, pH value set), the concentration of the titration solution, and the purity of
chemicals.
It is recommended to perform blank values, if:
∙ Fresh chemicals are used or
∙ Before starting determination in order to check the system.
If a blank value is activated for calculation, it remains active, until another blank value is activated.
