Metrohm 750 Autosampler - Manual (Page 54)

5.2 Interfaces
750 Autosampler
51
5.2 Interfaces
5.2.1 Contact closure strips
The contact closure strip 99 can be used
for external control of an injection valve.
The allocation of the 4 connections is
shown in Fig. 12. The output signals are
emitted as contact closures between two
connections.
LOAD (output signal for switching the
injection valve)
Automatic contact closure between connections 1 and 2 (normally
open) before the start of the filling process. This signal is used to switch
the injection valve of the 733 IC Separation Center to the "Fill" position.
INJECT (output signal for switching the injection valve)
Automatic contact closure between connections 3 and 4 (normally
open) at the end of the filling procedure. This signal is used to switch
the injection valve of the 733 IC Separation Center to the "Inject" posi-
tion.
The contact closure strip 10 10 can be used
both for external control of the 750 Auto-
sampler as well as for the control of ex-
ternal instruments via the 750 Autosam-
pler. The allocation of the 19 connections
is shown in Fig. 13. The output signals
are emitted as contact closures between
two connections; the input signals must
be applied in the same way between two
connections.
START (output signal for injection)
Automatic contact closure between con-
nections 1 and 2 (normally open) and 1
and 3 (normally closed) for each injec-
tion triggered by a method. Under
"
SYSTEM SETTINGS/Contact Closures/In
ject " the contact closure time can be set
between 1 … 32000 s (for manual injections the contact closure time is
always 6 s). This signal can be used, for example, for starting the data
evaluation system.
T1 (output signal for freely programmable event)
Contact closure between connections 4 and 5 (normally open) and 4
and 6 (normally closed) according to the time laid down in the method
"
Event1 Time
". The contact closure time can be set under "
SYSTEM
SETTINGS /Contact Closures/Event 1
" between 1 … 32000 s. This signal
can be used for controlling external instruments.
REMOTE INJ. VALVE
LOAD
8
7
6
5
4
3
2
1
INJECT
Fig. 12: Valve control
NO CONNECTION
READY INPUT
REMOTE STOP INPUT
GND
+5 VOLTS OUTPUT
GND
EXTERNAL INJECT INPUT
NC
NO
COM
NC
NO
COM
NC
NO
COM
NC
NO
COM
{
START
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
T1
T2
T3
Fig. 13: Inputs/outputs