Metrohm 746 VA Trace Analyzer - Manual (Page 67)

3 Installation
746 VA Trace Analyzer / 747 VA Stand
3-40
8 Use pipetting handle in an operation sequence
• Make sure that the 685 Dosimat with the connected pipetting handle is
connected to the "Dos.1" socket of the 746 VA Trace Analyzer.
• Enter the desired dispensing instructions for which the pipetting handle
should be used on the "OP. SEQUENCE" and/or "SEGMENTS" page. If
you enter a solution name Soln.name for this solution, make sure that no
Dosimat is assigned for this solution on the "SOLUTIONS" page
(parameter Pos. must be empty). The following dispensing instructions
are allowed: SMPL>M , CSOLN>M , ADD>M , RADD>M , DOS>M , PDOS>M , SDOS>M .
• Start program by pressing the key.
• If the desired dispensing instruction is executed, the message for manual
dispensing appears (e.g. DOS "SOLN.name" V.add" > M ).
• Put the pipetting handle into the waste beaker so that the pipetting tip is
at about the same level as the container with the solution that should be
pipetted and press the black button on the handle (if you press
at this time, you would have to add the solution manually).
• If the pipetting instruction is carried out for the first time or if the previous
pipetting instruction has been terminated by (see below), the
message Preparing Dosimat #X appears. Press the black button on the
handle.
• After rinsing of the pipetting tubing and formation of an air bubble, the
message Aspirating standard appears. Put the pipetting handle into
the desired solution with the pipetting tip immersed ca. 1 … 5 mm and
press the black button on the pipetting handle.
• After aspiration of the solution the message Dispensing solution
appears. Put the pipetting handle into the measuring vessel with the pi-
petting tip touching the wall and press the black button on the handle.
• The desired solution is dispensed into the measuring vessel. Afterwards
the message Rinsing tube appears. Put the pipetting tip into the rinsing
quiver installed to the waste beaker and press the black button on the pi-
petting handle.
• The pipetting tip is rinsed with dilution solution. Afterwards the message
Next operation / press to break appears. If you press the black
button on the handle or , the Dosimat will be ready for the next
dispensing instruction, if you press , the Dosimat is switched to
the exchange position.