2 tubing connection – Metrohm 757 VA Computrace User Manual

Page 45

3.8 Connection of 765 Dosimats

757 VA Computrace – Hardware

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.

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

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.