ROTRONIC MP400H - Manual (Page 11)

E-M-HM-V1_10
Rotronic AG
Bassersdorf, Switzerland
Document code Unit
HygroMet MP Humidity Temperature
Meteorological Probe: User Guide Instruction Manual
Document Type
Page 11 of 19
Document title
© 2009; Rotronic AG E-M-HM-V1_10
- 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
6.3 Wiring color code
The HygroMet MP is supplied with 3m (9 ft) of PUR cable with tinned ends. Before connecting the
power, please make sure that there is no wiring error. Improper wiring may damage the HygroMet MP.
To facilitate maintenance of the HygroMet MP, keep the probe cable short. Do not replace the cable
supplied with the probe with a much longer cable. If a long length of cable is required, use an extension
cable with a maximum length of up to 330 feet (100 meters). When transmitting analog voltage signals
over a long distance, you should use separate wires for power ground and for each signal ground.