Honeywell XNX Technical Manual

XNX Universal Transmitter
Section 4 - Maintenance
104
Warning: When servicing or replacing sensors, reduce the risk of ignition
of hazardous atmosphere by declassifying the area or disconnecting the
equipment from the supply circuit before opening the sensor enclosure.
Keep the assembly tightly closed during operation.
Warning: Take care when handling sensors as they may contain corrosive
solutions. Do not tamper or in any way disassemble the sensor cell. Do not
expose to temperatures outside the recommended range. Do not expose
the sensor to organic solvents or ammable liquids.
Warning: At the end of their working lives, sensors must be disposed of in an
environmentally safe manner, in accordance with local waste management
requirements and environmental legislation. Sensors should NOT be
incinerated as they may emit toxic fumes.
Warning: Verify all outputs, including display, after installation, after service
events, and periodically to ensure the safety and integrity of the system.
Caution: The following procedure should be followed carefully and
performed only by suitably trained personnel. A fault condition will be
signaled by the sensor if it is removed with the unit under power.
Note: If the power-on self-test was skipped during maintenance activities,
restart the transmitter.
4.1 MPD Sensor Cartridge Replacement
UsingFigure226asaguide,followthisprocedure:
1� Verifythatthelabelonthenewsensoristhecorrectgas
type�
2�Removepowerfromthetransmitter�
3�Unscrewtheweatherproofcover(ifequipped),loosenthe
retainerlockingscrew,andunscrewthesensorretainer�
4�Removetheoldsensorbypullingwithouttwisting�
5�SlidethereplacementcellintotheMPDbodytakingcare
toalignthetabwiththealignmentslot,thenpressthecell
rmlytoseatitintothebody�
6�Retthesensorretainer,tightenthelockingscrewandret
theweatherproofcover(ifequipped)�
7�RecalibratethesensorfollowingtheproceduresinSection
3�2�2�
Cell Alignment Slot
Sensor Cell
IR or Cat Bead
Sensor Retainer
and Locking Screw
Internal O-ring
(critical to performance times)
Figure 226. Removing the Plug-in Sensor

Honeywell XNX Specifications

General

Brand	Honeywell
Model	XNX
Category	Transmitter
Language	English