ROTRONIC HygroMet MP402H - Manual (Page 11)

E-M-HM-V1_12
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroMet MP Humidity Temperature
Meteorological Probe: User Guide Instruction Manual
Document Type
Page 11 of 20
Document title
© 2009-2011; Rotronic AG E-M-HM-V1_12
General guidelines for signal cables
The following guidelines are derived from European Standard EN 50170 for the transmission of signals by
copper wires. When planning an installation, the rules provided by EN 50170 should be followed under
consideration of local circumstances to determine the position of machines and equipment.
All ROTRONIC products are tested for Electromagnetic Compatibility according to EMC Directive
2004/106/EG and following European standards:
- EN 61000-6-1: 2001, EN 61000-6-2: 2005
- EN 61000-6-3: 2005, EN 61000-6-4: 2001 + A11
Whenever the level of electromagnetic interference is expected to be high, both the instruments and signal
cables should be placed as far away as possible from the source of interference.
In general, signal cables should be installed in bundles or channels / conduits, separate from other cables as
indicated in the table below:
•
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 (HygroMet MP 3-wire)
See document E-DV04-RS485.01: RS485 Network Installation and Start-up Guidelines