Metrohm 746 VA Trace Analyzer - Manual (Page 189)

5.3 Set Up
746 VA Trace Analyzer / 747 VA Stand
5-38
Softkeys Meaning
Dos
V.init
Dispense initial volume
After pressing this softkey, the selected Dosimat/Dosino (position of
the field cursor) dispenses the volume
V.init at the set Dosing rate
into the measuring vessel.
The total dispensed volume is displayed under
V.display .
Exchange
position
Switch Dosimat/Dosino to exchange position
In order to change the exchange or dosing unit, the 685 Dosimat or
700 Dosino must be in the
exchange position. If the Dosimat/Dosino
is in the dosing position, it has to be switched to the exchange
position by pressing or .
After the exchange or dosing unit has been changed, the Dosi-
mat/Dosino must be initialized by pressing
or
.
Prime
Dosimat
Initialize Dosimat/Dosino
The burette cylinder of the selected Dosimat/Dosino and all connect-
ing tubing up to the measuring vessel are automatically filled. Excess
solution is expelled to the measuring vessel.
Should the filling take longer than 30 s, the message
This operation
takes x.x minutes appears. The filling operation can then be started
with or aborted with to increase the filling rate. Once a filling
operation has been started, it can no longer be aborted.
After the filling, the initial volume
V.init is automatically delivered to
the measuring vessel. With V.init > 0 uL , the Dosimat/Dosino is
then in the dosing position and is ready for dispensing. With V.init
= 0 uL , the exchange position is retained, the Dosimat/Dosino is
ready for both dispensing and replacement of the exchange or dosing
unit.
To ensure the correct initializing of 700 Dosinos, the volume V.tube
in of the tubing from the supply bottle to the Dosino and V.tube out
of the tubing from the Dosino to the measuring vessel must be set.
To ensure the correct initializing of 685 Dosimats, the volumes V.tube
in and V.tube out must be set equal to the burette volume, so that
the burette cylinder is filled three times.
Fill
Dosimat
Fill Dosimat/Dosino
The burette cylinder of the selected Dosimat/Dosino (position of the
field cursor) is filled at the set
Filling rate .
Should the filling take longer than 30 s, the message This operation
takes x.x minutes appears. The filling operation can then be started
with or aborted with to increase the filling rate. Once a filling
operation has been started, it can no longer be aborted.
After the filling, the initial volume
V.init is automatically delivered to
the measuring vessel.
>> Switch to additional softkeys
Default
values
Reset parameters to default values
The parameters under Gen.settings and Dil.settings are reset to
their default values.