Honeywell XNX, Technical Manual

Page: 58 / 200

XNX Universal Transmitter
Section 2 - Installation and Operation 56
Note: Calibration of sensors attached to the transmitter is mandatory
before the sensor can be used for gas monitoring. Refer to Section
3 - Calibration for the procedure.
Note: For initial commissioning, refer to EN 60079-29-2.
2.4.2 LCD and LED Test
The LCD and LED test is performed in the initialization after
powering on� All LCD pixels and LEDs (red, green, and yellow)
are turned on for 1�5 seconds� The LCD then goes blank and the
LEDs turn off�
2.4.3 XNX IR Units Configured for Searchline Excel
When powering the transmitter fitted with a Searchline Excel
sensor, the following procedure must be followed to assure
proper installation�
1� Verify that the transmitter is wired correctly according to
this manual and the associated control equipment manual�
2� Apply power to the XNX transmitter� This will in turn
provide power to the sensor�
3� The sensor output will be forced to 2mA (default fault/
inhibit)�
4� The XNX transmitter will enter a boot-up routine, displaying
the initialization screen� The transmitter will load 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 63. 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�
5� When the XNX completes boot-up, perform a soft reset
(see Section 3�6 Soft Reset) on the Excel sensor from the
Calibration Menu� When the soft reset is intitated, the RS-
485 communication will be temporarily interrupted and
faults F120 and/or F161 may be observed� The RS-485
communication will be re-established in a few minutes and
the faults will automatically be reset in the Non-Latching
mode� F120 and/or F161 must be reset manually in the
Latching mode�
6� Set the Path Length for the application, then align the
transmitter and receiver (see Section 3�5 Align Excel )�
7� Once the alignment is complete, a Zero Calibration
must be performed on the Excel sensor to complete
the commissioning process� (See the Searchline Excel