Owner manual

3.8 Connection of 765 Dosimats
757 VA Computrace – Hardware
41
3.8.2 Tubing connection
For the addition of standard or auxiliary solutions into the measuring vessel of the
757 VA Computrace Stand the 4-way microtip
26
(6.1824.000) can be used. It is fit-
ted with 4 lengths of PTFE tubing with connection nipples for direct attachment to
the Exchange unit of the 765 Dosimat. To ready the 765 Dosimat for automatic dis-
pensing, proceed as follows:
1 Mount Exchange unit on 765 Dosimat
•
Procedure, see section
5 of 765 Instructions for Use
.
2 Insert 4-way microtip in 757 VA Computrace Stand
(see
section
3.2.4
)
•
Remove stopper from nipple
23
and insert 4-way microtip
26
into nipple
23
as far as it will go (see
Figs 3 and 6
).
•
Tighten nipple
23
using a 6.2739.000 Wrench (accessory of 6.3014.XXX
Exchange unit) so that the 4-way microtip
26
can no longer move.
•
Pull the 4 lengths of PTFE tubing of the 4-way microtip
26
in succession
from above through the opening
65
.
3 Connect PTFE tubing to Exchange unit
•
Unscrew the attached 6.1805.100 FEP Tubing
(
L
= 40 cm) from connection
2
(connection for burette
tip) of the flat stopcock on the Exchange unit mounted
on the Dosimat.
•
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 mounted on the Dosimat.
2
4 Close unused PTFE tubings
•
Screw a 6.1808.000 Coupling (accessory of 757 VA Computrace Stand)
on each unused PTFE tubing of the 4-way microtip
26
.
•
Screw a 6.1446.040 Dummy stopper (accessory of 757 VA Computrace
Stand) on each 6.1808.000 Coupling.
5 Initialize Dosimat(s)
•
Switch on the 765 Dosimat.
•
Switch on the 757 VA Computrace Stand using the mains switch
12
.
•
Switch on the PC and start the VA Computrace program.
•
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.