Owner manual

3.9 Connection of 685 Dosimats

746 VA Trace Analyzer / 747 VA Stand

3-37

3.9.4 Changing the Exchange unit

The Exchange unit mounted on the 685 Dosimat can be changed only in the

exchange position. Please proceed as follows:

Switch to exchange position

• Select dialog page "DOSIMATS".

• Select desired Dosimat with the cursor keys and press softkey <Exchange

position>: The Dosimat is switched to the exchange position and the

parameter Position is set to exchange.

Change Exchange unit

• Unscrew connection nipple of the PTFE tubing of the 4-way microtip 4747

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 4747 onto connection 2 of the flat stop-

cock on the Exchange unit.

Initialize Dosimat(s)

• Switch on 746 VA Trace Analyzer using the mains switch 1111.

• Select dialog page "DOSIMATS".

• Select desired Dosimat with the cursor keys and press softkey <Prime

Dosimat> for initializing the Dosimat. The burette cylinder is filled and ex-

cess solution is expelled to the measuring vessel. With standard acces-

sories, all tubings to the measuring vessel will be filled at the end of the

initializing procedure.

• Start the initializing procedure a second time by pressing the softkey

<Prime Dosimat> again.

• Start the initializing procedure a third time by pressing the softkey or

<Prime Dosimat> again.