KROHNE OPTISOUND 3050C 4wire EN - Manual (Page 23)

If potential equalisation currents are expected, the connection
on the evaluation side must be made via a ceramic capacitor
(e.g. 1 nF, 1500 V). The low frequency potential equalisation
currents are thus suppressed, but the protective effect against
high frequency interference signals remains.
Take note of the corresponding installation regulations for Ex
applications. In particular, make sure that no potential equal-
isation currents flow over the cable screen. In case of
grounding on both sides this can be achieved by the use of a
capacitor or a separate potential equalisation.
5.2 Connection procedure
Proceed as follows:
1 Unscrew the housing cover
2 Loosen compression nut of the cable entry
3 Remove approx. 10 cm (4 in) of the cable mantle (current
output), strip approx. 1 cm (0.4 in) insulation from the ends
of the individual wires
4 Insert the cable into the sensor through the cable entry
5 Lift the opening levers of the terminals with a screwdriver
6 Insert the wire ends into the open terminals according to
the wiring plan
7 Press down the opening levers of the terminals, you will
hear the terminal spring closing
8 Check the hold of the wires in the terminals by lightly
pulling on them
9 Connect the screen to the internal ground terminal and the
external ground terminal to potential equalisation
10 Tighten the compression nut of the cable entry, the seal
ring must completely encircle the cable
11 Connect the lead cable for power supply in the same way
acc. to the wiring plan, in addition connect the ground
conductor to the inner ground terminal.
12 Screw the housing cover back on
The electrical connection is finished.
Select connection
cable for Ex applica-
tions
OPTISOUND 3050 C - 4 ... 20 mA/HART - four-wire 23
Connecting to power supply
30518
-EN
-050914