Installation
7
gas-lab
Q1
Page 111
Important note:
It is very important to adjust the HART polling addresses
individually in the sensors
before
connecting them altogether to the
corresponding input channel at the
gas-net
device in de-energized conditions.
If you change the polling addresses later, the device cannot correctly identify the
individual sensors. If this cannot be avoided, it is sufficient to initiate a short
mains failure afterwards. When the device starts up again, all connected HART
sensors are polled once for the device to find out the current polling addresses.
The device supplies the measuring sensors with power. For this, shielded cable
must be used. However, the shielding is only fixed at the device but not at the
sensor. If the line diameter is 1.5 square mm, the cable should not be longer
than 100 m. If the cable is longer, it must be guaranteed that the lines are
installed separately from other conducting lines to avoid interferences.
The cable shielding for all transmitter lines is connected to the
SH
terminal at
the EXMFE4 input board.