Hydrocont K
page 7 of 16
Electrical connection
The electrical connection of the device must be carried out according to the respective country specific
standards.
Incorrect installation or adjustment could cause applicationally conditioned risks.
Use only twisted shielded signal and measurement wires and install these wires separated from power leading
wires. Connect the cable shield only at one side to earth, ideally at the installation place of the device.
The earthing of the cable shield of an connected cable can be done at the installation place of the connection
housing by using the terminal PE. At the variant with plug M12x1 the earthing of the cable shield must be done
at the evaluation side of the installation.
The metallic parts of the device (probe housing, screwing thread of the connection housing) are electrically
connected with the terminal PE in the connection housing. The socket of the plug M12x1 is not connected to the
other metallic parts of the device.
The cable gland is suitable für cable diameter from 7 to 13 mm.
After the installation of the cable the cable gland must be firmly screwed to ensure the tightness of the
connection housing. The same is valid for the housing cap.
The voltage applied to the plug contacts may not exceed 45 V
,
to avoid damage of the electronic.
All connections are polarity protected.
A load, e.g. the measuring shunt of an evaluation device, in series with a device with 4...20 mA current signal in
2-wire-technology reduces the supply voltage available at the device. This results in a maximum value for this
resistor, where a correct function is still possible.
The maximum load at signal current 20mA can be calculated by the equation:
R
L
max = (V
S
– 12,5V) / 20mA with V
S
= applying supply voltage.
For inauguration it is suggested, to deactivate all connected control devices, to avoid unwanted control
reactions.
connection – non explosive hazardous area
Power supply
12,5..45V DC
evaluation device
e.g.
display
controller
writer
=
+V
S
-V
S
terminal 1
I
Meas
terminal 2
+V
S
terminal 3
I
OUT
(4…20mA)
terminal 4
PE/shield
4...20mA
1
2
3
4
3
PE-Anschluss über
Einschraubgewinde
2
PE-Anschluss über
Einschraubgewinde
PE connection by
screw in thread
connection – explosive hazardous area
4...20mA
Power supply
12,5..30V DC
evaluation device
e.g.
display
controller
writer
=
+V
S
-V
S
isolation barrier
1
2
3
4
view to
plug socket
PE connection by
screw in thread
1
PE-Anschluss über
Einschraubgewinde
3
PE-Anschluss über
Einschraubgewinde
terminal 1
I
Meas
terminal 2
+V
S
terminal 3
I
OUT
(4…20mA)
terminal 4
PE/shield
1
2
3
4
3
PE-Anschluss über
Einschraubgewinde
2
PE-Anschluss über
Einschraubgewinde
PE connection by
screw in thread
1
2
3
4
view to
plug socket
PE connection by
screw in thread
1
PE-Anschluss über
Einschraubgewinde
3
PE-Anschluss über
Einschraubgewinde
