3
/10
2
Evaluation Unit
The evaluation unit is built into a poly-carbonate housing (IP65). The electrical connections to the
power supply, reference potential, sensor electrodes and relay contacts are established via three
cable connections.
Figure 1
2.1
Electrical Connections
Con-
nector
Pin Connection
X1
1
24 V
AC/DC
Supply Voltage
Both polarity accepted
2
3
PE
Reference Potential
Connected to the earth
X2
1
C
Relay common contact
2
NO
Relay normally open contact
3
NC
Relay normally closed contact
X3
1
Core
Connected to the measuring electrode.
Use coaxial cable (75Ω)
2
Shield
Connected to the opposite electrode
By inductive load connected on X2 (relay output), use spike suppression to prevent damage of the
relay contacts.
