BUCHI KjelSampler K-377 - Manual (Page 103)

6 Operation
103 K-375/376/377 Operation Manual, Version B
(screenshot stretched)
Parameters for Boric acid titration with poten-
tiometric sensor
Select
Boric acid titration for the parameter
“Titration type“. The volume of the boric acid to be
dosed into the receiving vessel can be specified
and the titration solution can be selected from the
Volumetric solutions list (see chapter ”6.8.2
Volumetric Solutions”).
Select
Potentiometric for the parameter “Sensor
type“.
For the “Titration mode” either
Online or Standard
can be selected:
Online: The titration is already started, while the
distillation is running. With the parameter “Titration
start time“ a delay time for the titration start can be
defined.
Standard: The titration is started sequential after
the distillation is finished.
With the parameter “Measuring mode“ the determi-
nation method for the endpoint of the titration can
be determined:
Startpoint: the endpoint pH value is determined
by a measurement of the boric acid in the receiving
vessel previous to the distillation process.
Endpoint: the endpoint pH value can be entered
as number using the parameter “Endpoint pH“.
Furthermore the stirrer speed for the titration and a
titration start volume can be specified. The speci-
fied titration start volume is dosed into the receiving
vessel at the beginning of the titration when
samples are analyzed.
With the parameter “Titration algorithm” one of
two available algorithms for the titration can be
selected:
Optimal: This algorithm has been optimized with
respect to the duration of the titration and the accu-
racy of the result. It is recommended for samples
with a higher nitrogen content.
Normal: This algorithm has been optimized with
respect to the accuracy of the result but will require
a longer time than the optimal algorithm. The
normal algorithm is recommended for samples with
low nitrogen content and when using titration solu-
tions with high concentration (e.g. 0.5 N).