Metrohm 796 Titroprocessor - Manual (Page 61)

4. Manual operation
796 Titroprocessor, Instructions for use 55 55
Buret units
In order that the Prepare (PREP) and Empty (EMPTY only for 700 Dosino)
functions can be optimally used the correct type of buret unit should be
selected for each dosing device.
³ Concentr. 0.01 mol/L
³ Tubing Default
ß Buret unit type
³ Buret type 10.0mL
(with selection list)
The definition of buret units with their corresponding tubing parameters can
be carried out during configuration, see page 47ff.
4.2.2 Dosing device functions
In order to operate a Dosimat or Dosino manually place the field cursor in
the column of the required dosing device and press the corresponding
softkey.
Softkeys
[Fill
all]
causes all connected dosing devices to fill their burets.
[Fill]
triggers buret filling for the selected dosing device.
[Prepare
buret]
triggers a preparation cycle ( PREP) for the selected
dosing device. The tubing and cylinder of the buret unit
are rinsed in accordance with the tubing parameters of
the type of buret unit (see page 47ff).
[Dosing
drive]
opens the dialog window for manual dosing with the
selected dosing device, see below.
[Empty]
triggers emptying ( EMPTY) the buret of the selected
dosing device. The tubing and cylinder of the buret unit
are emptied in accordance with the tubing parameters of
the type of buret unit (see page 47ff). This is only possible
with 700 Dosinos.
[STOP]
stops the current process for the selected dosing device.
[STOP
all]
stops all connected dosing devices.
In order to achieve the highest possible accuracy and to ensure that there
are no air bubbles in the tubing the
‘Prepare’ function should be carried out
before the start of a series of determinations. This function should be used
as often as is necessary, but at least once per day.
The ‘Empty’ function is useful if the reagent in a buret unit is to be
exchanged. The tubing and the buret cylinder are emptied so that the
reagent can be exchanged without great loss of reagent.
The
‘Prepare’ and ‘Empty’ functions are automated filling and dosing
processes which take the volumes of the buret unit cylinder tubing into
account. This is why it is necessary to enter the dimensions of the tubing as