AFH-G
Seite 6
AFH-G 07/02
For data and signalling lines, shielded cable should be used, and the shielding
must be applied to the earth terminal. Ensure that earth circuits and fault currents
do not arise as a result of a second earth connection.
For equipment with a network connection, it is recommended that a separate
network circuit be used.
During the switch process, electrical power consumers such as switch contactors,
magnetic valves etc. produce induction voltages that can cause interference. In
the trade there is an abundance of protective and suppressor component parts
that are most effective when applied directly to the source of the trouble. A suit-
able suppressor has the added advantage that components such as relays, mi-
croswitches etc. have a longer service life.
Further difficulties during installation can arise if signalling lines are joined to-
gether with common lines. It is essential to check whether this is permissible. In-
terference is particularly likely when installing using equipment of different
makes. Here, too, the trade offers isolating amplifiers that overcome the problem.
Installation:
The installation position should be chosen so as to prevent condensed water
from entering the housing. The preferred installation position is "sensor vertically
pointing downwards" or "sensor horizontal".
A grommet in the probe prevents penetration of water in the installation positions
described above.
Wall mounting set
