Protecting Wiring Of Switching Contacts - Crison MultiMeter 44 Manual Del Usuario

Figure 6 Interior view. Terminal assignment
Channel 1
1
Channel 2
2
Channel 3
3
3.4.5

Protecting wiring of switching contacts

pH/mV Electrode
Signal
Ground Cell
DO Sensor (M)
RS 232 Relays
Alarm
1 2 3 4 5
Limit the current up to 3A by using one fuse. Do not connect cables with voltage higher than 24 V
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.
Relays
Relays
E.C.
(Conductivity)
Relays
D.O.
(Membrane)
RS 232 Relays Mains Fuse
Alarm Cleaning 110/230V: T100L 250V
N L
24V:
1 2 3 4 5 6 7 8 9 10
Mains Fuse
Cleaning 110/230V: T100L 250V
N L
24V:
6 7 8 9 10
Power supply, relays and communication
4
Indicator for fused fuse
5
Fuse
6
D A N G E R
Installation
1
2
3
4
T500L 250V
5
T500L 250V
6
17