Metrohm 746 VA Trace Analyzer - Manual (Page 60)

3.9 Connection of 685 Dosimats
746 VA Trace Analyzer / 747 VA Stand
3-33
3.9 Connection of 685 Dosimats
Up to four 685 Dosimats can be attached to the 746 VA Trace Analyzer for the
automatic addition of standard and auxiliary solutions. The 685 Dosimat and the
accessories needed have the following ordering designations (see also section
9.5):
• • 2.685.0010 Dosimat
• • 6.2134.000 Cable 685 – 746
• • 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 µ L 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 685 Dosi-
mat and the various Exchange units can be found in the 685 Instructions for Use of
the 685 Dosimat.
3.9.1 Electrical connection
Before a Dosimat is attached to the 746 VA Trace Analyzer, the 746 VA
Trace Analyzer must be switched off using the mains switch 11 11.
Connecting a 685 Dosimat to the 746 VA Trace Analyzer when the
latter is switched on can lead to destruction of the Dosimat!
The 685 Dosimat is connected to the 746 VA Trace Analyzer with the optionally
available 6.2134.000 Cable. The "remote control" sockets of the 685 Dosimat are
connected to the appropriate socket "Dos 1...4" (18 18 ... 21 21) of the 746 VA Trace
Analyzer (see Fig. 19). Maximum 4 Dosimats can be attached in this manner.
For settings (dosing rate, filling rate, etc.) and manual operation (manual filling or
dispensing) of the 685 Dosimat, dialog page "DOSIMATS" must be selected (see
section 5.3.3).
685 remote
control
0
I
Control Lines
Printer
External Bus
Dos. 1
Dos. 2
Dos. 3
Dos. 4
RS 232 Interface 1
RS 232 Interface 2
Reset
2A(TH)
115V 230V
230V
746
Fig. 19: Connection of 685 Dosimats to 746 VA Trace Analyzer
6.2134.000 cable