Metrohm 726 Titroprocessor - Manual (Page 174)

8.7 KFC
726 Titroprocessor, Instructions for use 168 168
KFC modes produce the following system variables:
COV conditioning volume; reagent consumption for conditioning
DRC volume drift in conditioned state (µL/min)
$CRF conditioning flag; correctly conditioned yes/no (1 or 0)
These system variables can be used to apply an automatic drift volume re-
duction:
Formula:
Drift red. R1=DRC/60*(ITD+MD)/1000 mL
EP corr. R2=EP1-R1 mL
Here it is assumed that owing to external influences a volume drift is effec-
tive during the sample titration and whose value corresponds to the volume
drift in a conditioned state (variable DRC). Its duration is equivalent to the
period between conditioning switch-off and sample titration switch-off
(ITD+MD * ).
* ITD= Intermediate titration duration, time between conditioning switch-
off and the start of the next titration in s.
MD= Mode duration, sample titration time in s.
Assignment parameters for KFC modes:
The assignment parameters (Comments, Reagent … etc.) for the KFC
modes are the same as those of the DET modes, see page 129f.
8.7.1 Specific parameters for KFC modes [ * Param ]
The specific parameters for the respective KFC mode can be found under
the softkey [* Param ].
ЪДДД KFC_IPOL* Parameter ДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДД¿
³ ³
³ Titration conditions ³
³ Direction neg. Temperature 25.0 øC ³
³ End-point at 250 mV I(pol) 50 µA ³
³ Adjustment medium ³
³ ³
³ Fill. rate max mL/Min ³
АДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДДД QUIT ÄÙ
Titration conditions
These are the actual titration parameters which control the measurement re-
cording and the dosing behavior during the titration itself.
Direction
Control direction
pos. | neg. |auto
The direction of the measurement alterations is important
for titration control in the KFC mode. Normally the 'neg.'
setting should be used. The 'pos.' and 'neg.' settings re-