8 connection of dosing devices, 1 electrical connection, 2 tubing connection – Metrohm 797 VA Computrace User Manual
Page 48: Connection of dosing devices, Electrical connection, Tubing connection
2 Installation
797 VA Computrace / Hardware-Manual 8.797.8001EN
40
2.8
Connection of Dosing devices
For the automatic addition of standard and auxiliary solutions, up to three Dosing de-
vices (possible: 700/800 Dosino or 685/805 Dosimat) can be attached via the MSB
sockets MSB1 - MSB3 (12) to the 797 VA Computrace Stand.
For the connection of four additional Dosing devices, a 846 Dosing In-
terface can be used (from software version 1.2). The 846 Dosing Inter-
face (ordering details see Section 4.3.1) can be connected to a USB
Connection 19 of the 797 VA Computrace or to a USB Connection of
the PC. For the controlling of the Dosing devices, see the Software
Manual 8.797.8033.
Following Dosing devices can be operated with the 797 Computrace:
800 Dosino with Dosing unit 807
700 Dosino with Dosing unit 807
805 Dosimat with Exchange unit 806
685 Dosimat with Exchange unit 806
(for the connection, cable 6.2134.030 is needed)
Dosing- and Exchange Units have burette volumes from 1 mL – 50 mL. The choice be-
tween Exchange unit and Dosing unit depends on the volume of liquid the Dosi-
mat/Dosino should dispense. A burette volume of 5 mL (Exchange unit) or 2 mL (Dos-
ing unit) is recommended for additions in the μL range (standard additions solutions),
a burette volume of 10 mL or higher is recommended for additions in the mL range
(auxiliary solutions).
Ordering descriptions of all Dosing devices, Dosing- and Exchange units and cables
can be found in section 4.3.
This section describes the connection procedure; further details on Dosing devices and
the different Dosing- and Exchange units can be found in the respective Instructions
for Use.
2.8.1 Electrical
connection
Connect all Dosing devices to an MSB-connection 12
of the 797 VA Computrace
Stand and switch the 797 VA Computrace Stand on at the main switch 14. MSB-
Connections can be extended with the cable 6.2151.010. The connection must not
be longer than 15 m.
For hardware-settings of the Dosing units see 797 Software Manual and the respec-
tive Instructions for Use.
2.8.2
Tubing connection
For the addition of volumes < 2 mL of standard or auxiliary solutions into the measu-
ring vessel of the 797 VA Computrace Stand, the 4-way microtip 30 (6.1824.000) can
be used. It is fitted with 4 lengths of PTFE tubing with connection nipples for direct at-
tachment to the Dosinos or Dosimats. To ready the Dosing devices for automatic dis-
pensing, proceed as follows: