User Manual

E-M-HF63_65-V1_11
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
Instruction Manual
Document Type
HygroFlex HF63/HF65 Humidity Temperature
Transmitters: User Guide
Document title
Page
17 of 34
© 2008; Rotronic AG E-M-HF63_65-V1_11
• Bus signals such as RS485
• Data signals for PCs, printers etc.
• shielded analog inputs
• unshielded direct current (<= 60V)
• shielded process signals (<= 25 V)
• unshielded alternate current (<= 25V)
• coaxial cables for CRT monitors
in common bundles or channels / conduits
• direct current from 60 V to 400 V
(unshielded)
• alternate current from 25V to 400 V
(unshielded)
in separated bundles or channels /
conduits, without minimum distance
• direct and alternate current > 400 V
(unshielded)
• Telephone lines
• lines leading into EX-rated areas
in separated bundles or channels /
conduits, without minimum distance
Lightning protection
Cabling in areas with a risk of lightning requires a lightning protection. For cabling underground in between
buildings, we recommend the use of special fiber optic cables. If this is not possible, use copper cables that
are suitable for underground installation.
6.2 Guidelines for RS-485 wiring (HF65)
See document E-DV04-RS485.01: RS485 Network Installation and Start-up Guidelines
6.3 Cable grip and cable specifications
The HF6 is supplied with either one or two M16 sealing cable grips or one or two ½” conduit adapters. The
M16 cable grip provides effective sealing only with cables having the proper outside diameter. Preferably, use
a cable with an outside diameter of 6 to 7 mm (0.236 to 0.275 inch) with 18 AWG wires.