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.
