Metrohm 757 VA Computrace - Manual (Page 46)

3 Installation
757 VA Computrace – Hardware
42
3.8.3 Changing the Exchange unit
The Exchange unit mounted on the 765 Dosimat can be changed only in the ex-
change position which is reached after filling. Please proceed as follows:
1 Fill exchange unit
At the start of the VA Computrace program, the exchange unit is automati-
cally filled. So this step is only necessary if the Dosimat has already been
used during the running program session.
• Click on or MAIN WINDOW / Utility / Dosimat control to open the DOSI-
MAT CONTROL window.
• Select the desired Dosimat in the Burette field.
• Click the button to fill the exchange unit installed on the
Dosimat.
2 Change Exchange unit
• Unscrew connection nipple of the PTFE tubing of the 4-way microtip 26
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 26 onto connection 2 of the flat stop-
cock on the Exchange unit.
3 Enter new volume of Exchange unit
If the volume of the new Exchange unit is different to the volume of the old
one, proceed as follows:
• Select
MAIN WINDOW / Settings / General Settings. Open the Hardware tab in
the GENERAL SETTINGS window.
• Enter the new
Volume of the Exchange unit installed on the 765 Dosimat.
• Close the VA Computrace software by clicking on or selecting File /
Exit .
• Restart the VA Computrace software.
4 Initialize Dosimat(s)
• Click on or MAIN WINDOW / Utility / Dosimat control to open the DOSI-
MAT CONTROL window.
• Select the desired Dosimat in the Burette field.
• Click the button to empty and refill the exchange unit in-
stalled on the Dosimat. Repeat this procedure two times.
• Check if there are air bubbles left in the glass cylinder of the exchange
unit. If this is the case, repeat the flushing procedure by clicking the
button.
• Close the DOSIMAT CONTROL window.