3 changing the exchange unit – Metrohm 757 VA Computrace User Manual

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3 Installation

757 VA Computrace – Hardware

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

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

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.