Metrohm 757 VA Computrace - Manual (Page 44)

3 Installation
757 VA Computrace – Hardware
40
3.8 Connection of 765 Dosimats
The predecessor model 665 Dosimat can also be connected instead
of the 765 Dosimat.
Up to five 765 Dosimats can be attached to the 757 VA Computrace Stand for the
automatic addition of standard and auxiliary solutions. For the connection of 1 or 2
Dosimats, the 6.2141.080 Cable is used, for the connection of up to 5 Dosimats, the
6.9921.170 cable. The 765 Dosimat and the accessories needed have the following
ordering designations (see also section 6.2):
• 2.765.0010 Dosimat
• 6.2141.080 Cable 757 – 2 × 765
• 6.3014.XXX Exchange
unit, with PCTFE/PTFE flat stopcock
6.3014.153 burette volume V = 5 mL
6.3014.213 burette volume V = 10 mL
6.3014.223 burette volume V = 20 mL
6.3014.253 burette volume V = 50 mL
The choice of Exchange unit depends on the volume of liquid the Dosimat should
dispense. A burette volume of 5 mL is recommended for additions in the µL range
(standard additions solutions), a burette volume of 10 mL or higher is recom-
mended for additions in the mL range (auxiliary solutions).
This section describes the connection procedure; further details on the 765 Dosimat
and the various Exchange units can be found in the 765 Instructions for Use.
3.8.1 Electrical connection and setup
Before a 765 Dosimat is attached to the 757 VA Computrace Stand,
the 757 VA Computrace Stand must be switched off using the mains
switch 12.
One or two 765 Dosimats are connected to the 757 VA Computrace Stand with the
optionally available 6.2141.080 Cable. The "A" socket of the 765 Dosimat is con-
nected to the socket "Remote" 15 of the 757 VA Computrace Stand.
For hardware settings of the 765 Dosimats in the VA Computrace program see 757
Software Manual.
For settings (dosing rate, filling rate, etc.) and manual operation (manual filling or
dispensing) using the keyboard of the 765 Dosimat, see 765 Instructions for Use.
If 765 Dosimats are connected to the 757 VA Computrace Stand, the
instruments must always be switched on in the sequence 765 → 757
→ PC.