Limaco ULM-3D Series, Operating And Installation Manual

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5. ELECTRICAL CONNECTION
5.1 General instructions
All connections shall be made when the voltage is off.
Electrical connection shall be performed by qualified personnel who have a permit
for this type of work.
Two cable glands with self-sealing NPT threads may be installed in the level trans-
mitter. When delivered from the manufacturer, one cable gland with a process plug
can be installed in the transmitter housing. In this case, a certified plug is installed
in place of the second cable gland.
Do not:
- leave the device in the mounting position without a process plug, without a con-
nected cable;
- leave the level transmitter in the mounting position with the cable connected, but
the cable gland not tightened;
- leave unused cable glands unplugged, a certified plug shall be installed in their
place.
5.2 Connection cable
To connect analog output 4-20 mA, use a standard pair of conductors in a separate
shield.
To connect RS-485 digital interface, use a pair of shielded conductors, a batch-
shielded cable may be used.
Use round cables. To ensure the declared IP characteristics of protection against
dust and moisture, use a cable of the appropriate diameter for the given cable gland.
See further information in cl. 12.1 of Technical specifications. Electromechanical
data.
Do not insert multiple cables into the device via a single cable gland.
!
ATTENTION
!
ATTENTION
!
WARNING
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