Honeywell XNX-AM Series, Technical Manual

Page: 51 / 207

XNX Universal Transmitter
Installation and Operation 49
Note:
The black and red wires from the MPD are not used with the mV personality
board. Ensure that they are properly isolated from live connections. Do NOT cut the
wires.
NOTE
!
Warning:
The enclosures of remotely mounted 705HT sensors contain aluminum. Be
careful to avoid ignition hazards due to impact or friction when installed in Zone 1
locations.
WARNING
!
All cable port devices and blanking elements must be certified in
type of explosion protection flameproof enclosure “Ex d” or “Ex e”,
suitable for the conditions of use and correctly installed.
9. Plug the connector into the back of the mV personality board.
10. Install the mV sensor.
11. Terminate wiring at the mV sensor.
12. At the transmitter, pass the wires through the ferrite bead as
shown in Figure 46 and terminate the wiring at the pluggable
terminal block as shown in Figure 44 .
13. Fit the terminal box lid.
14.
Fit the sensor retainer, tighten the locking screw and fit the
weatherproof cover (if required).
15. Calibrate the sensor following the procedure in the
Calibration section.
Note: Environmental conditions that compromise the IP66 protection provided by
the weatherproof cover will extend published response times. Safety protocols
or maintenance procedures that consider these environmental conditions are
recommended.
NOTE
!
IR Personality Wiring
The RS-485 digital communication is the primary interface in
which the transmitter reads gas concentration and sensor status
from the Optima Plus/Searchline Excel. If RS-485 communication
fails, the Optima Plus/Searchline Excel 4-20mA output becomes
the primary source to read gas concentration.
The transmitter allows local programming and configuration
through the local LCD display as well as through the HART
protocol. Gas concentrations can be viewed at the transmitter
from the Searchpoint Optima Plus or Searchline Excel via
4-20mA output as well as from the digital communication
connection on TB2 that can provide additional diagnostic
information. The gas concentration is taken from the digital
communication line as long as it is in agreement with the 4-20
mA output, otherwise the 4-20mA output takes precedence.
Caution: Dress the wires properly so that cabling does not contact switches 1-4 on
the back of the POD.
CAUTION
!