Honeywell XNX, Technical Manual

Page: 57 / 200

XNX Universal Transmitter
Section 2 - Installation and Operation 55
2.4 Powering the XNX for the First Time
2.4.1 XNX Units Configured for EC, mV, and IR
(except Searchline Excel)
After mounting, wiring the transmitter, wiring the specific mV or IR
sensor or installing the EC cartridge, the installation is visually and
electrically tested as described below�
Warning: Minimum and maximum controller alarm levels should not
be set at less than 10% or greater than 90% of the full scale range
of the sensor. CSA and FM agency limits are 60% LEL or 0.6mg/m
3
.
1� Verify that the transmitter is wired correctly according to
this manual and the associated control equipment manual�
2� If equipped, unscrew the weatherproof cover, loosen the
sensor retainer locking screw, and unscrew the retainer�
3� For EC sensors, plug in the sensor cartridge, taking care to
align the sensor pins with the connector holes in the PCB�
Caution:
For toxic sensors, remove the shorting clip from the bottom
of the sensor prior to installation. No shorting clip is provided with O
2
sensors.
4� Refit the sensor retainer, tighten the locking screw and refit
the weatherproof cover�
Note: Before replacing the cover on the transmitter housing, coat the
threads with anti-seize compound to prevent corrosion buildup.
Note: Inspect the cover O-ring for cracking or any other defects that
might compromise the integrity of the seal. If it is damaged, replace
with the O-ring supplied in the accessory kit.
5� Apply power to the transmitter� This will in turn provide
power to the sensor�
6� During warmup, the XNX transmitter will be forced to 2mA
(inhibit mode)�
7� The transmitter will enter a boot-up routine displaying the
initialization screen� The transmitter loads its operating
system, data from the sensor, sensor software version
numbers, gas type, the detection range and span
calibration gas level, estimated time to next calibration
due, and self test result� This will take about 45 seconds�
Figure 62. XNX Initialization and General Status Screens
In the final stages of boot-up, warnings and faults
may be observed until the user performs the proper
configuration, calibration, and reset activities
described in the following sections� See
Section 5 for
descriptions of warnings and faults�
Once the General Status screen appears, the
transmitter and sensor are in normal monitoring mode�