17
Installation
Figure 6 Interior view. Terminal assignment
3.4.5 Protecting wiring of switching contacts
The relays contacts are subjected to electrical erosion. Especially the inductive and
capacitive loads reduce the service life of the contacts. To eliminate sparks and arcing,
components such as combinations of resistances and capacitors (RC), non-linear
resistors, series resistors and diodes are used.
1 Channel 1 4 Power supply, relays and communication
2 Channel 2 5 Indicator for fused fuse
3 Channel 3 6 Fuse
Ground
Relays
E.C.
(Conductivity)
RelayspH/mV Electrode
Signal
Cell
D.O.
(Membrane)
RS 232 Relays
NL
Mains
Fuse
110/230V: T100L 250V
24V: T500L 250V
8910
GND
TxD
RxD
Alarm Cleaning
123 4567
Relays
DO Sensor (M)
RS 232 Relays
NL
Mains
Fuse
110/230V: T100L 250V
24V: T500L 250V
8910
GND
TxD
RxD
Alarm Cleaning
123 4567
1
2
3
4
5
6
DANGER
Limit the current up to 3A by using one fuse. Do not connect cables with voltage higher than 24 V
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