Honeywell XNX, Technical Manual

Page: 48 / 200

XNX Universal Transmitter
Section 2 - Installation and Operation 46
5� Attach the conduit to the remote terminal box�
6� In the remote junction box, connect the wires from the
transmitter to the 3-way terminal block in the terminal box�
Note:
The black and red wires from the MPD are not used with the
XNX mV personality board. Ensure that they are properly isolated
from live connections. Do NOT cut the wires.
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.
All cable port devices and blanking elements shall be certified in
type of explosion protection flameproof enclosure “Ex d” or “Ex e”,
suitable for the conditions of use and correctly installed�
7� Attach and wire the sensor in the terminal box�
8� Fit the terminal box lid�
9� Fit the sensor�
10� Calibrate the sensor following the procedure in Section 3�2
- Calibration �
2.2.9 IR Personality Wiring
The XNX Universal Transmitter allows local programming and
configuration through the local LCD display as well as through
the HART protocol� Gas concentrations can be read at the
transmitter from 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.
The transmitter provides a 4-20mA output reflecting the input
received� It also offers diagnostic information or data via HART
or any of the additional communication options offered�
Read
Section 2�2 which defines the XNX power and 4-20mA
output connections that are common to all personalities�
Warning:
Power off the transmitter before changing S3 or S4. Both
switches must be set in either Source or Sink prior to applying power.
Caution: Do not force the POD into the enclosure. Doing so may
result in damage to the wiring or the POD or may alter the switch
settings. If resistance is felt, wires may be preventing the POD from
being properly positioned.
Do not adjust switch settings while power is applied to the
transmitter; doing so will cause permanent damage�
Connecting a Searchpoint Optima Plus or Searchline Excel
Connections from the Searchpoint Optima Plus or Searchline
Excel to the transmitter are made via two pluggable terminal
blocks allowing ease of installation and service (see
Figure
49 )� HA recommends that an 8” service length of wiring be
maintained�
In remote mount configurations, the maximum distance between