Metrohm 746 VA Trace Analyzer User Manual
Page 70
3.10 Connection of 700 Dosinos
746 VA Trace Analyzer / 747 VA Stand
3-43
3.10.3 Tubing connection for addition of auxiliary solutions
The 4-way microtip 47
47 is not suited for the addition of auxiliary solutions in the mL-
range into the measuring vessel of the 747 VA Stand. For the addition of a first aux-
iliary solution we recommend the use of the following accessories:
•
• 1 ×× 6.1819.000 PTFE tube, length L = 77 mm, i.d. = 0.8 mm
•
• 2 ×× 6.1805.100 FEP tubing, length L = 40 cm, i.d. = 2 mm
•
• 1 ×× 6.1808.000 Coupling
To install these accessories and 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 PTFE tube in 747 VA Stand
•
Cut 6.1819.000 PTFE tube (optionally available) to a length of ca. 30 mm
(the tip of the tube should never be immersed into the solution).
•
Remove dummy stopper 42
42 and insert PTFE tube from above in the
opening 78
78 of the measuring head 41
41 (see Fig. 9).
3 Connect FEP tubing to Dosing unit
•
Screw 6.1805.100 FEP tubing (optionally available) into opening 78
78.
•
Screw a 1808.000 Coupling (accessory of 747 VA Stand) to the other end
of the 6.1805.100 FEP tubing and insert this in a slot of the tubing holder
at the rear of the 747 VA Stand.
•
Screw the 6.1805.100 FEP tubing (accessory of Dosing unit) onto con-
nection 1 of the Dosing unit.
•
Screw the other end of the 6.1805.100 FEP tubing attached to the Dosing
unit to the 6.1808.000 Coupling just inserted in the tubing holder of the
747 VA Stand.
4 Initialize Dosino(s)
•
Switch on 746 VA Trace Analyzer using the mains switch 11
11.
•
Select dialog page "DOSIMATS".
•
Set parameter
V.init
to
0.00 mL
.
•
Set parameter
V.tube in
to
0.7 mL
.
•
Set parameter
V.tube out
to
3.0 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.