7 kfc – Metrohm 796 Titroprocessor User Manual

Page 174

8.7 KFC

796 Titroprocessor, Instructions for use

168

8.7 KFC

Conditioning for a Karl Fischer titration is implemented as an independent
mode. The

KFC mode has its own set of parameters. The settings for con-

ditioning and the titration itself should, if possible, not differ too much from
each other.
A

KFC mode does not produce a measuring point list and therefore no

curves can be shown. No facilities for calculations are provided.

Conditioning is normally carried out in the background, i.e. as soon as the
conditioning mode has been started the 796 Titroprocessor can carry out
other commands (e.g.

CRTL_RS1, etc.). A conditioning process also re-

mains active even when a determination has been completed, provided that
it has not been explicitly terminated, see below.

A conditioning mode carried out in the background is controlled by the
WAIT_C command (see page 209f). This checks whether the conditioned
has been achieved and, if necessary, switches the conditioning mode off.

Example:

KFC_U*

KFC_U* ДДДДДДДДДДДДД

ДДДДДДДДДДДДД¿

CTRL_RS1 ... |

CTRL_RS1 ... |
... KFC_U*

... KFC_U*
... ...

... ...
WAIT_C ...

WAIT_C ... ДДДДДДДДД

ДДДДДДДДДЩ

ASK

ASK
KFT_U*

KFT_U*

The

WAIT_C command synchro-

nizes the background conditioning
process with the method being car-
ried out in the foreground. The
WAIT_C command interrupts the
regular method run until the back-
ground process (conditioning) has
been completed.

Note! Every titration, measuring or calibration mode also terminates back-
ground conditioning. Achievement of the conditioned state is not taken into
account.

Two

KFC modes are available for conditioning to a preset endpoint; these

differ in the measured quantity or measuring mode:

KFC_UPOL*

measured quantity µA (selectable pol.voltage in mV)

KFC_IPOL*

measured quantity mV (selectable pol.current in µA)

The following information applies to all

KFC modes. Any variations are

noted.

KFC_IPOL*

conditioning

for Karl Fischer titration

Reagent Sensor

Concentr. Meas. input Apol
Dos. drive A1

applies to

⇒

KFC_UPOL*, KFC_IPOL*