4�8 Ir Personality Wiring - Honeywell XNX Quick Start Manual

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.
CAUTION
The enclosure of the remotely mounted 705 HT sensor contains aluminum. Care must be taken to
avoid ignition hazards due to impact or friction when installed in the Zone 1 location.
All cable entry devices and blanking elements of the Junction Box shall be certified in type of
explosion protection "Ex d" or "Ex e", suitable for the conditions of use and correctly installed.
14. Attach and wire the sensor into the terminal box.
15. Fit the terminal box lid.
16. Fit the sensor retainer, tighten the locking screw and fit the
weatherproof cover (if required).
17. Calibrate the detector following the procedure in Section 8.1 -
Calibration.
Ensure that wiring is adequately protected from mechanical failure in
installation. Specific shorted or open circuit conditions of wiring to the
MPD **I** sensors may result in full scale concentration readings prior to,
or preventing the internal diagnostic routines from identifying the external
installation fault.
4.8 IR Personality Wiring
The RS-485 digital communication is the primary interface in which the XNX
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.
Connections from the Searchpoint Optima Plus or Searchline Excel to the XNX
are made via two pluggable terminal blocks allowing ease of installation and
service (see Figure 20). HA recommends an 8" (203mm) service length for wiring
be maintained.
Be sure wires for 4-20mA outputs are routed away from sources of noise such as
relay wires The Searchpoint Optima Plus or Searchline Excel can be supplied in
either Sink or Source mode operation and is typically labeled on the white wire
exiting the Searchpoint Optima Plus or Searchline Excel. Use the table in Figure
20 to set S3 and S4 to the complimentary operating state of the equipment.
For more information see the Searchpoint Optima Plus Operating Instructions
(2104M0508) or the Searchline Excel Technical Manual (2104M0506).
CAUTION
Be certain to dress the wires properly to ensure cabling does not contact switches 1-4 on the back of
the POD.
Do not force the POD into the enclosure as it may indicate an interference condition resulting in
damage to the wiring, POD or switch settings.
XNX Universal Transmitter Quick Start Guide
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