Metrohm 746 VA Trace Analyzer User Manual
Page 66
3.9 Connection of 685 Dosimats
746 VA Trace Analyzer / 747 VA Stand
3-39
5 Prepare waste beaker
•
Put 6.2754.000 Rinsing quiver onto the lip of an empty waste beaker.
Before starting any initialization, dilution or pipetting functions with the
pipetting handle, hold the pipetting handle so that any solution leaving
the pipetting tip is expelled into the waste beaker.
6 Initialize Dosimat
•
Switch on 746 VA Trace Analyzer using the mains switch 11
11.
•
Select dialog page "DOSIMATS".
•
Set parameter
V.tube in
for the desired Dosimat
to
1.7 mL
.
•
Set parameter
V.tube out
for the desired Dosimat
to
4.8 mL
.
•
Take pipetting handle by hand and put it into the waste beaker with the
pipetting tip down.
•
Select desired Dosimat with the cursor keys <ç> or <è> and press
: The burette cylinder is filled and excess solution is ex-
pelled to the waste beaker.
•
Start the initializing procedure a second time by pressing the softkey
again.
•
Start the initializing procedure a third time by pressing the softkey
Dosimat>
again. All tubings up to the pipetting tip will have been filled at
the end of the initializing procedure.
7 Use pipetting handle for preparation of diluted solutions
•
Select dialog page "DOSIMATS".
•
Select desired Dosimat and set parameters
C.init std
,
C.end dilution
and
V.end dilution
for preparing a diluted solution (details see section
5.3.3).
•
Put the pipetting handle into the waste beaker so that the pipetting tip is
at about the same level as the container with the concentrated solution
(e.g. standard) and press the softkey
.
•
If the dilution is carried out for the first time or if the previous dilution has
been terminated by
Preparing
Dosimat #X
appears. Press the black button on the handle.
•
After automatic aspiration of the dilution solution from the reagent bottle
the message
Aspirating standard
appears. Put the pipetting handle
into the concentrated solution with the pipetting tip immersed ca.
1
…
5 mm and press the black button on the handle.
•
After aspiration of the concentrated solution the message
Dispensing
solution
appears. Put the pipetting handle into the desired void con-
tainer with the pipetting tip touching the wall and press the black button
on the handle.
•
Concentrated and dilution solution are dispensed into the void container.
Afterwards the message
Next operation
/
press
ap-
pears. If you press the black button on the handle or
simat will be ready for another dilution, if you press
is switched to the exchange position.