Connection - Siemens SITRANS LG250 Operating Instructions Manual

Connection technology
Connection procedure
22
equalisation currents can flow over the cable screen if the screen is
grounded on both ends.
To avoid this, the cable screen in such applications must be con-
nected only on one end to ground potential in the switching cabinet.
The cable screen must not be connected to the inner ground terminal
in the sensor and the outer ground terminal on the housing must not
be connected to potential equalization!
Information:
The metal parts of the instrument (antenna, transmitter, concentric
tube, etc.) are conductive connected with the inner and outer ground
terminal on the housing. This connection exists either directly metallic
or with instruments with external electronics via the screen of the
special connection cable.
You can find specifications on the potential connections inside the
instrument in chapter "Technical data".
5.2

Connection

The voltage supply and signal output are connected via the spring-
loaded terminals in the housing.
Connection to the display and adjustment module or to the interface
adapter is carried out via contact pins in the housing.
Proceed as follows:
1. Unscrew the housing cover
2. If a display and adjustment module is installed, remove it by turn-
ing it slightly to the left.
3. Loosen compression nut of the cable entry gland
4. Remove approx. 10 cm (4 in) of the cable mantle, strip approx.
1 cm (0.4 in) of insulation from the ends of the individual wires
5. Insert the cable into the sensor through the cable entry
Fig. 12: Connection steps 5 and 6
SITRANS LG250 - Operating Instructions PBD-51041388