Metrohm 796 Titroprocessor - Manual (Page 167)

8. Command reference
796 Titroprocessor, Instructions for use 161 161
buret cylinders; however, when the method is carried out
the dosing speed will automatically be reduced to the larg-
est possible value.
Pause 1
Delay before start of preliminary dosing
0 … 9999 s
Before the preliminary dosing is started a delay period can
be allowed to elapse. This can be used, for example, to en-
sure that a sample is completely dissolved in a solvent.
Pause 2
Delay before the start of the controlled titration
0 … 9999 s
Before the controlled titration is started a delay period can
be allowed to elapse. If a preliminary dosing has been car-
ried out then the delay period will start when the preliminary
dosing has been concluded. This option should be used
when a sample requires a certain reaction time in order to
start the titration reaction.
Extract. time
Minimum duration of a titration
0 … 9999 s
If a sample is difficult to dissolve it is recommended that an
extraction time is defined to ensure that a
KFT titration is
not concluded until at least the extraction time has elapsed.
This means that if an endpoint is reached prematurely then
during the extraction time – if necessary – the preset meas-
uring value for the endpoint will continue to be held.
Titration conditions
These are the actual titration parameters which control the measurement re-
cording and the dosing behavior during the titration itself.
Direction
Direction of potential jump
pos. | neg. |auto
The direction of the alteration in the measurements is im-
portant for titration control in the
KFT mode. Normally the
'neg.' setting should be used. The 'pos.' and 'neg.' set-
tings refer to the numerical measured value alterations. The
potential jump direction can also be determined automati-
cally. The potential jump direction is then obtained from the
initial measured value and the preset target endpoint.