KROHNE OPTISWITCH 3300C Relay EN - Manual (Page 16)

5 Connecting to voltage supply
5.1 Preparing the connection
Generally not the following safety instructions:
l
Connect only in the complete absence of line voltage
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 WE60R 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 OPTISWITCH 3300 C 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 stated in the "Technical data" in
the "Supplement".
OPTISWITCH 3300 C 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 entry.
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
OPTISWITCH 3300 C.
Take note of the corresponding installation regulations for Ex
applications.
5.2 Connection steps
With Ex instruments, the housing cover may only be opened if
there is no explosive atmosphere present.
Proceed as follows:
Note safety instructions
Take note of safety
instructions for Ex
applications
Select power supply
Selecting the connection ca-
ble
Select connection
cable for Ex applica-
tions
16 OPTISWITCH 3300 C - with relay output
Connecting to voltage supply
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-EN
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