Metrohm 746 VA Trace Analyzer User Manual
Page 69
3 Installation
746 VA Trace Analyzer / 747 VA Stand
3-42
3.10.2 Tubing connection for addition of standard solutions
For the addition of standard solutions in the
µ
L-range into the measuring vessel of
the 747 VA Stand the 4-way microtip 47
47 (6.1824.000) should be used. It is fitted
with 4 lengths of PTFE tubing with connection nipples for direct attachment to the
Dosing unit of the 700 Dosino. To ready the 700 Dosino for automatic dispensing,
proceed as follows:
1 Mount Dosing unit on 700 Dosino
•
Procedure, see section 2.2 of 700 Instructions for Use.
2 Insert 4-way microtip in 747 VA Stand (see section 3.3.2)
•
Remove stopper from nipple 44
44 and insert 4-way microtip 47
47 into nipple
44
44 as far as it will go (see Figs 7 and 9).
•
Tighten nipple 44
44 using a 6.2739.000 Wrench (accessory of 6.3030.XXX
Dosing unit) so that the 4-way microtip 47
47 can no longer move.
•
Pull the 4 lengths of PTFE tubing of the 4-way microtip 47
47 in succession
from above through the opening 86
86.
3 Connect PTFE tubing to Dosing unit
•
Screw connection nipple of the PTFE tubing of the 4-way microtip 47
47 onto
connection 1 of the Dosing Unit mounted on the Dosino.
•
To lengthen the tubing connection the 6.1805.100 FEP tubing (L = 40
cm, accessory of Dosing Unit) can be inserted between PTFE tubing and
connection 1 of the Dosing Unit using the 1808.000 coupling.
4 Close unused PTFE tubings
•
Screw a 6.1808.000 Coupling (accessory of 747 VA Stand) on each
unused PTFE tubing of the 4-way microtip 47
47.
•
Screw a 6.1446.040 Dummy stopper (accessory of 747 VA Stand) on
each 6.1808.000 Coupling.
5 Initialize Dosino(s)
•
Switch on 746 VA Trace Analyzer using the mains switch 11
11.
•
Select dialog page "DOSIMATS".
•
If volumes
≤
50
µ
L should be dispensed, set parameter
V.init
to
0.05 mL
.
•
Set parameter
V.tube in
to
0.7 mL
.
•
Set parameter
V.tube out
to
0.2 mL
.
•
Press softkey
for initializing all attached Dosinos or select
desired Dosino with the cursor keys and press softkey
:
The cylinder is filled and excess solution is expelled to the measuring
vessel. With standard accessories, all tubings to the measuring vessel will
have been filled at the end of the initializing procedure.