Connecting To Power Supply; Preparing The Connection; Connection Procedure - Siemens SITRANS LVL200S Operating Instructions Manual

Connecting to power supply

Note safety instructions
Take note of
safety instruc-
tions for Ex ap-
plications
Select power supply
Selecting connection
cable
Select connec-
tion cable for Ex
applications
16
5 Connecting to power supply

5.1 Preparing the connection

Always keep in mind the following safety instructions:
Connect only in the complete absence of line voltage
l
In hazardous areas you should take note of the appropriate
regulations, conformity and type approval certificates of the
sensors and power supply units.
Connect the power supply according to the following diagrams.
Oscillator with relay output is designed in protection class 1.
To maintain this protection class, it is absolutely necessary that
the ground conductor be connected to the internal ground
terminal. Take note of the general installation regulations. As a
rule, connect SITRANS LVL200S to vessel ground (PA), or in
case of plastic vessels, to the next ground potential. On the
side of the housing there is a ground terminal between the
cable entries. This connection serves to drain off electrostatic
charges. In Ex applications, the installation regulations for
hazardous areas must be given priority.
Data for power supply are specified in chapter "Technical
data".
SITRANS LVL200S is connected with standard cable with
round cross section. An outer cable diameter of 5 ... 9 mm
(0.2 ... 0.35 in) ensures the seal effect of the cable gland.
If cable with a different diameter or wire cross section is used,
exchange the seal or use an appropriate cable connection.
In hazardous areas, only use approved cable connections for
SITRANS LVL200S.
Take note of the corresponding installation regulations for Ex
applications.

5.2 Connection procedure

With Ex instruments, the housing cover may only be opened if
there is no explosive atmosphere present.
Proceed as follows:
SITRANS LVL200S l RELAY (DPDT)