Hach-Lange TITRALAB 840_845 Reference Manual - Manual (Page 54)

Titra Lab ® TitraLab 840 and 845 Reference Manual
Page 54
Blank volume Volume of titrant consumed by the titration on a blank sample.
If you run an End point titration with several E.P., a blank volume is
found for each E.P. If you run an Inflection point titration, one blank
volume is found irrespective of the number of Inflection points found
for the method. This blank volume is determined on a particular
inflec tion point of the titration curve,
see "Min. ordinate Max. ordinate
- Blank", page 120 .
When you run a method with a blank for the first time, the blank is
determined and stored along with the method. If the method is
restarted, you will be given the choice to run a sample analysis or a
blank analysis.
For a sample analysis using an End point method, a blank volume will
be automatically subtracted from each end point found.
For a sample analysis using an Inflection point method, a blank
volume will be automatically subtracted from the Inflection point
selected by the user,
see "Blank on inflection no.", page 53 .
Burette
functions menu These functions can be activated during the preparation of the
burette, before installing the reagent.
To access, press 3 in the Reagents window. To run a burette function,
select the burette in the Address field, then press 1 to 5
corresponding to the required procedure. The title bar shows the
volume of the burette in use. You can replace (key 4) or remove this
burette (key 5).
Figure 10: Burette functions menu (burette installed/not installed).
Burette speed The maximum burette speed (in ml/min) is three times the nominal
value of the burette per minute. However, for the 50 ml burette the
maximum burette speed is 1.5 times the nominal value, i.e. 75 ml/min.