Siemens SITRANS LVL200E Руководство по эксплуатации - Страница 17
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Note safety instructions
Take note of
safety instruc-
tions for Ex ap-
plications
Voltage supply
Connection cable
Connection ca-
ble for Ex appli-
cations
SITRANS LVL200E - CONTACTLESS ELECTRONIC SWITCH
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 operating voltage according to the following diagrams.
Oscillator SWE60C 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 LVL200E 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.
The data for power supply are specified in chapter "Technical data".
The instrument is connected with standard two-wire cable without
screen. If electromagnetic interference is expected which is above the
test values of EN 61326 for industrial areas, screened cable should be
used.
Use cable with round cross-section. A cable outer diameter of 5 ... 9 mm
(0.2 ... 0.35 in) ensures the seal effect of the cable gland. If you are
using cable with a different diameter or cross-section, exchange the
seal or use a suitable cable gland.
In hazardous areas, only use approved cable connections for SITRANS
LVL200E.
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:
1
Unscrew the housing cover
2
Loosen compression nut of the cable entry
5 Connecting to power supply
17