Metrohm 711 Liquino - Manual (Page 52)

3.2 Tutorial
711 Liquino, Instructions for use 46
3.2.10 XDOS – temperature-controlled addition
Example: during the preparation for a nitration 0.3 mol semi-concentrated
hydrochloric acid is to be added to 0.1 mol freshly distilled aniline. During
this process the temperature of the mixture should, if possible, not exceed
10°C.
The 711 Liquino will carry out the reagent addition and control the tempera-
ture.
Preconditions / Preparation
To carry out the above task the following items are required:
• the new 711 Liquino
• a Dosino 700 with a 50 mL dosing unit 710
• a printer with cable if the process is to be documented (see page 12)
• a four-neck flask with precision glass stirrer shaft
• a cooling device (if an appropriate cooling bath is used this can even be
switched on and off by the Liquino via the remote interface).
A dosing unit which corresponds to the tubing used for the Dosino must be
defined. This process is described on page 22.
Screw the Dosino 700 on to the bottle containing hydrochloric acid, place
the 0.1 mol aniline in the four-neck flask and carry out the method described
below under intensive stirring. The flask must be cooled continuously. If the
temperature limit of 10 °C is exceeded the Liquino immediately stops the
HCl addition. As soon as the temperature sinks below 10 °C again the
Liquino continues with the addition
*) .
Method editing
*
MODE
-
X
DOS NR
SELECT
P
• The XDOS mode must first be activated. This sets all method parame-
ters to standard values. Press the <MODE> key and then <SELECT>
until ‘XDOS’ appears in the display:
Di spl ay: mode sel ect : XDOS
ENTER
YES • Press <ENTER>. The instrument is now in the XDOS mode.
Di spl ay: XDOS * * * * * * * *
r eady 0. 000 mL
*) An upper and lower temperature limit can be defined as well as the action to be taken when these limits are
exceeded. Possible actions are:
• none (limit violations are only mentioned in the report)
• stop
• switch instrument to HOLD condition (restart with <CONTINUE>)
• stop, wait until the temperature is again within the limits and then continue automatically.