Metrohm 746 VA Trace Analyzer - Manual (Page 64)

3.9 Connection of 685 Dosimats
746 VA Trace Analyzer / 747 VA Stand
3-37
3.9.4 Changing the Exchange unit
The Exchange unit mounted on the 685 Dosimat can be changed only in the
exchange position. Please proceed as follows:
1 Switch to exchange position
• Select dialog page "DOSIMATS".
• Select desired Dosimat with the cursor keys and press softkey
position> : The Dosimat is switched to the exchange position and the
parameter Position is set to exchange .
2 Change Exchange unit
• Unscrew connection nipple of the PTFE tubing of the 4-way microtip 47 47
from connection 2 and take off old Exchange unit.
• Mount new Exchange unit on Dosimat and screw connection nipple of the
PTFE tubing of the 4-way microtip 47 47 onto connection 2 of the flat stop-
cock on the Exchange unit.
3 Initialize Dosimat(s)
• Switch on 746 VA Trace Analyzer using the mains switch 11 11.
• Select dialog page "DOSIMATS".
• Select desired Dosimat with the cursor keys and press softkey
Dosimat>
for initializing the Dosimat. The burette cylinder is filled and ex-
cess solution is expelled to the measuring vessel. With standard acces-
sories, all tubings to the measuring vessel will be filled at the end of the
initializing procedure.
• Start the initializing procedure a second time by pressing the softkey
again.
• Start the initializing procedure a third time by pressing the softkey or
again.