Metrohm 756 KF Coulometer - Manual (Page 33)

3.4 Configuration, key <CONFIG>
756/831 KF Coulometer, Instructions of Use 25
3.4.1 Reagent exchange procedure with Dosino
Reagent exchange is automatic (if a reagent monitoring
responds) or is triggered with <EXCH>. During the ex-
change
changing reagent
appears in the display.
Current production and stirrer are switched off.
The waiting time is allowed to elapse. In this time it is pos-
sible to wait for the separation of e.g. a 2-phase mixture.
In this way it is possible to aspirate only 1 phase (e.g. oil
samples).
The given volume is aspirated. A volume slightly larger
than that which is actually to be aspirated should be en-
tered if you want to empty the titration vessel completely.
Rinsing the titration vessel. The rinsing volume is added,
the stirrer switched on for 10 s, and then the rinsing vol-
ume (+3 ml) is aspirated off again. This process is re-
peated for each rinsing cycle.
Normally rinsing is not necessary.
The reagent volume is added and the tubing emptied.
The stirrer is switched on again and the titration vessel is
conditioned.
Basically the instrument is in the same status after the re-
agent exchange as it was before.
<EXCH>
or
Automatic exchange
Conditioning off
Stirrer off
(Waiting time)
(Rinsing volume)
(Rinsing cycles)
Reag.volume
Aspiration volume
Stirrer on
Conditioning on