SICK LFH Mode D'emploi page 18

Operating Instructions
Mechanical connection
(A)
Electrical connection
Operate the pressure transmitter with a shielded cable and ground the shield at least on
„
one side of the cable, if the cable is longer than 30m (2-wire) or 3m (3- or 4-wire), or if it is
run outside of the building.
Use power supplies which guarantee reliable electrical isolation of the operating voltage
„
as per IEC/DIN EN 60204-1. Consider also the general requirements for PELV circuits in
accordance with IEC/DIN EN 60204-1. Alternative for North America: The connection may
also be made to "Class 2 Circuits" or "Class 2 Power Units" according to CEC (Canadian
Electrical Code) or NEC (National Electrical Code).
There must be no differences in potential between medium/tank and the grounding of the
„
junction box and the control cabinet when the shield of the cable is applied.
Ingress protection IP 68 per IEC 60529
„
Please make sure that the ends of cables do not allow any ingress of moisture.
„
18 © SICK AG • Germany • Subject to change without notice 8013156/U878 /2010-05-01
7. Starting, operation
Product label (example)
(B)
Generally the serial number on the product label applies.
Serial No.
Part No.
LFH