Honeywell XNX-AM Series, Technical Manual, Page: 65 / 207

XNX Universal Transmitter
Installation and Operation 63
Remote Calibration of MPD Sensors
In addition to functional gas testing to ensure the system is
operating properly, remote calibration of the MPD CB1 catalytic
combustible sensor and MPD IV1 and MPD IF1 infrared
combustible sensors can be performed provided the following
requirements are met:
• Remote sensor is installed in an indoor environment
•
Internal air velocity does not exceed 0.5 m/s
• Weather housing part number 0200-A-1640 is installed on the
sensor housing
• A 1 LPM regulator is used for calibration gas delivery
Perform the remote calibration procedure in accordance with
The Product Specifications section except using the weather
guard (Honeywell part number 0200-A-1640) instead of the
regular flow housing (Honeywell part number 1226A0411).
Honeywell Analytics recommends MPD sensor calibration at a
maximum interval of 180 days (the default value). This value can
be reprogrammed in accordance with site procedures to assure
the highest level of safety. Verify the correct operation of each
sensor before each use by calibration with a certified test gas of
known concentration.
The pellistors used in flammable gas sensors can suffer
from a loss of sensitivity when in the presence of poisons or
inhibitors, e.g., silicones, sulfides, chlorine, lead, or halogenated
hydrocarbons.
Configuring the Transmitter
The transmitter can be configured via the local user interface by
using the menus available in Configure Menu. For information
on accessing and navigating the menus, see Controls and
Navigation . The transmitter is shipped with these settings:
Display Language
English
Date Format mm/dd/yy
Time Format HH:MM
mV Sensor Type (w/mV
personality) MPD-IC1 (%Vol)
Alarm Levels
Sensor Cartridge Dependent
Latching/Non-Latching Alarms
Alarm: Latching
Fault: Non-Latching
Display Units
PPM, %VOL or %LEL
(dependent on personality and sensor choice)
4-20 mA Levels
1
Inhibit: 2.0 mA
Warning: 3.0 mA
Overrange: 21.0 mA
Temperature Warning*
Enabled
Deadband
Enabled
Calibration Interval
180 Days (HA recommends 30 day interval)
Unit ID XNX #nnnnnnnn
Relay Settings Alarm Normally De-Energized
Fieldbus
Settings
HART
®
Address: 0
Mode: Point-To-Point
Modbus
®
(if installed)
Address: 5
Baud Rate: 19200
Level 1 Password Access
0000
Level 2 Password Access
0000
Easy Reset Enabled Yes
*Remark: Temperature warning is disabled as default for only XNX Russian version