Honeywell XNX™ Universal Transmitter 

Supports the widest range of sensors on a common platform and offers a modular choice of inputs and outputs (saving customers time and money).

Explosion-Proof Transmitters

Features & Benefits
Flammable gas detection 0 to 100% LFL/LEL
Flexible operation options
Minimal training required
Quick Specs
Material: LM25 aluminum, painted (SS316 painted optional)
Temperature: -40° to +65°C / -40° to +150°F (sensor dependent)
Humidity: 20 to 90% RH (non-condensing) 

Product Overview
XNX's advantage comes from a simple-to-use, low-maintenance universal platform that works with other safety equipment on a digital bus system, including Honeywell Analytics’ own Searchline Excel, Optima or other gas detectors, industry standard PLCs and third-party gas monitoring controllers. 
XNX supports Electrochemical, Infrared and Catalytic Bead gas monitors and uses standard 4-20mA wiring and HART; options include Modbus, Fieldbus (pending) up to three relays and a local Hart Adapter for configuration and diagnostics using existing HART handheld devices.  
With 200+ unique configurations, XNX satisfies Class 1/Class 2 intrinsically safe, explosion-proof requirements in upstream/downstream oil, chemical, wastewater and other industries. 
The enclosure is available in stainless steel or aluminum, with a marine-grade coating. Five threaded ports, available in metric or NPT versions, and ruggedized mounting options provide ultimate installation flexibility.  Instrumentation built on various sensing technologies can be attached locally to the transmitter or remotely with the appropriate accessories.

A universal transmitter for toxic,
oxygen and combustible gas
detection compatible with all
Honeywell gas sensing technologies

High performance
• Flammable gas detection 0 to 100% LFL/LEL
• Point IR with heated optics provides immunity to
poisoning and no hidden faults
• Open-path IR flammable gas detection in
LEL-m measurement
• Electrochemical cell offers toxic gas detection in ppm
• IR cell provides CO2
 and combustible gas monitoring
• Robust and reliable operation in explosive areas and
harsh environments
Flexible Operation
• 3 versions - supports (Catalytic Bead and IR Cell),
Electrochemical Cell and IR (point and open-path)
gas detection
• Multi-Purpose Detector (MPD) with field serviceable mV,
Catalytic bead and IR Cell capability
• 4-20mA with HART® as standard
• HART Enhanced Device Description Language
(EDDL) software*
• Multiple communications options include up to 3 relays,
MODBUS® and FOUNDATION® H1 Fieldbus
• Optional local IS port for handheld HART configurator
Easy to Use
• Large, backlit, easy-to-view LCD display offers multisensory
indicators (visual icons, colored buttons, text,
etc.) to display gas and sensor readings
• User interface supported by 8 selectable languages
(English, Spanish, German, Italian, Portuguese, French,
Russian, Chinese)
• Self-test and fault indication features
• Non-intrusive, one-man operation
• Quick calibration with auto-inhibit
Easy to Install
• 3 or 4 wire operation, source, sink or isolated
• Simple plug-in sensors and replaceable cells
• NEMA 4X IP66 rated for rugged
indoor/outdoor use
• Five conduit entries for ease of installation
Cost Effective
• Minimal training required
• One-man operation
• Plug-in sensor replacement
• All necessary accessories included
The XNX Universal Transmitter, now with HART
EDDL, marks a new turn in gas detection from
Honeywell Analytics. It supports the widest
range of sensors on a common platform and
offers a modular choice of inputs and outputs.
XNX is designed for flexible integration, simple installation, user-friendly operation
and straight-forward maintenance. It is ideal for use with a range of gas
monitoring controllers or industry standard PLCs. The introduction of our HART
Enhanced Device Descriptor Language (EDDL) software provides users with an
at-a-glance indication of the health of their gas detectors in the field.
Bringing together the best solutions in gas detection

Electrochemical
• Proven electrochemical
sensing technology
• Surecell™ electrochemical cells are
ideal for hot and humid environments
• Long life sensing cells
(typical >2 years)
• Patented ‘Reflex’ sensing element
verification diagnostics
• Sensor recognition software auto
configures transmitter
• Plug and play factory
configured sensors
• Intrinsically safe sensor connection
permits hot swap, reducing down time
Catalytic Bead
• Supports Honeywell Analytics 705,
705HT, Sensepoint, Sensepoint HT
and MPD sensors
• Fast response to wide range of
hydrocarbons and flammables
Infrared (Open Path IR,
Point IR, IR Cell)
• Supports Honeywell Analytics Searchline
Excel, Searchpoint Optima Plus
• Failsafe operation
• Fast speed of response
• Reduced routine maintenance
• Immune to catalytic poisons
• Long operating life
• Works in inert atmospheres
The XNX’s powerful advanced
communications module – including
our new HART EDDL software – adds
increased efficiency, functionality and
flexibility to a gas detection network.
XNX offers a variety of communication options to suit your industrial
operation’s unique and changing needs. HART communication comes
standard on the XNX — with optional EDDL — along with optiona
Modbus, Foundation Fieldbus or relays. It can interface with a PLC and a
host of other protocol compatible devices found in industrial applications.
Unique to the XNX and Honeywell Analytics is our new HART EDDL
software, which allows you to manage all of your HART devices’
advanced diagnostic data right from your PLC.
With the XNX, you are freed from the need to add extra controllers,
junction boxes, relays, monitors and other equipment accessories. The
integration of our EDDL software also enables the XNX to work with a
number of third-party distributed control systems (DCS).
EDDL Software
Honeywell Analytics’ EDDL software
allows you to get real-time advanced
diagnostics without having to customprogram
your PLC/DCS. It allows you
to manage your gas detection data
from your PLC/DCS and generates a
visual depiction of the XNX’s advanced
diagnostics, including protective
maintenance, live gas trending,
event history and more.

General Specifications
Material LM25 Aluminum, painted (SS316 painted optional)
Cable Entries 5 conduits/cable entries – (2 right, 2 left, 1 bottom) Available in ¾” NPT, or M25
Termination Cage Clamp pluggable Terminal Blocks with retaining screws, 0.5 to 2.5mm (12-28 AWG)
Mounting Integral cast mounting tabs provide secure mounting to surfaces and channel. Can be mounted to 2 to 6 inch pipe or ceiling with corresponding mounting kit (optional)
User interface Standard Custom Backlit LCD. 2.5” High Resolution DOT Matrix Display. Discrete Alarm and Status indication. Reliable Non-Intrusive 4 button interface magnetic wand access.
Signal 0-22mA analog current loop output with HART (version 6) compatible standard. Optional relay or Modbus.
Environmental
Temperature -40°C to +65°C / -40°F to +150°F (sensor dependent)
Humidity 20 to 90% RH non-condensing
IP Rating NEMA 4X IP66
Options
 Relay Option 3 - SPDT (2 Alarm, 1 Fault) Relays; 250 VAC 5A, 24VDC 5A (Resistive) with External Reset Input or Modbus option: RTU protocol; selectable Baud Rate
 Optional HART with IS Port
Operating Voltage
 18-24 VDC Nominal (EC & mV units 16-32 VDC; IR units 18-32 VDC (Class 2 supply required)
Power Consumption
 XNX used with: electrochemical sensor: 6.2 watts; millivolt (catalytic bead or IR cell): 6.5 watts; point Infrared sensor (Searchpoint Optima): 9.7 watts; open-path Infrared
(Searchline Excel): 13.2 watts
Hazardous Area Approvals (Transmitter/Sensor Dependent)
 UL, cUL classified: UL 1203 and 913 Seventh edition; CSA, CSA 22.2 No. 30, CSA 22.2 No. 157
 Class 1, Division 1, Groups B, C, D / Class 1, Zone 1, Groups IIB + H2 T4 Tamb -40c to 65c
 DEMKO* IEC 60079-0, 4th ED; IEC 60079-15th Ed; IEC 60079-11 5th Ed. NCC INMETRO*
 Type Approval: EX [ia]d IIB + H2 T4 Tamb -40c to 65c
Performance Approvals (Sensor Dependent)
 Flammable gases: CSA 22.2 No. 152, FM* 6310, 6320, DEKRA/EXAM* IEC/EN 60079-29-1, EN 61779-4:2000 Toxic and Oxygen
 FM* ISA 92.0.01; DEKRA/EXAM* EN 45544:2000, EN 50104: 1999
 Functional Safety: TUV EN 61508 SIL 2 Component Certification
Display Module & User Interface (Standard)
Display Type Backlit LCD
Information Displayed Base Information: Gas Reading; Gas Name and Units of measurement; Fault and Alarm Status; Large Numeric concentration or LEL display; Bar graph
showing current reading, set points and full scale.
 Fault/Alarm and Security settings allow multi level operator access for set-up, configuration and calibration
 Operating Status Indication: Event history stores Time and Date of all Alarm, Diagnostic, Configuration events
Interface Magnetic wand with terminal screwdriver (supplied each unit)
4-20mA & HART (Standard Supply)
Description Fully configurable isolated 4-20mA & HART output module providing current sink, current source and isolated modes of operation. (supports HART 6.0 protocol)
Non-intrusive Interface Optional local IS port to enable HOT connection of a HART handheld configurator
Operating Modes Current sink / Current source / Isolated current sink /Conventional or with HART data
Output Range 0 to 22mA
4-20mA Signal Accuracy +/- 1% FS
Max loop resistance 600 Ohms at 24Vdc loop supply
Functions Supported Gas Reading Detailed Sensor Information Including: RTC (Excel Only)
via HART Gas Name and Units of measurement Optical Signal Level Calibration and Configuration status
 4-20mA signal level Dynamic Reserve (Excel Only) Detailed Fault and Warning Information
 General/Device Information Raw reading Fault and Alarm History
 Installation 24V supply voltage Zero Calibration
 Configuration Temperature
 Forcing of 4-20mA output
Local IS HART Port (Optional)
Description Provides externally accessible IS connections to the XNX transmitter to enable HOT connection of HC275/375 HART or equivalent hand held configurator.
Installation Fitted to one of the cable entries on the XNX transmitter.
Environmental Protection Terminals protected by cover to IP 66 when not in use
Relay Module (Optional)
Description Provides three fully user configurable relay outputs that can be switched based on the current gas level and/or status of the transmitter. Provides 2 x SPCO
 alarm and 1 x SPCO fault relays. Single Pole Double Throw SPDT. Option PCB Factory installed in display module.
Installation Fitted into housing base either at the factory or in the field by qualified service engineer.
Rating Maximum: 240 VAC, 5A (non inductive load) / 24 VDC 5A CES Minimum: 5V, 10mA (non inductive load)
Electrical Connections Fault: Common, Normally Open, Normally Closed
 Alarm 1: Common, Normally Open, Normally Closed
 Alarm 2: Common, Normally Open, Normally Closed
Configuration Default Configurable Options
 Fault Relay: Fault Relay:
 Normally energized Normally energized / normally de-energized
 Non latching None
 Signal inhibit as fault Enable/disable
 Alarm 1 / 2 Relays: A1 / A2 Relays:
 Normally de-energized Normally energized / de-energized
 Non latching Latching / non latching
 Alarm rising on gas reading Alarm on rising / falling
 Alarm level 20% and 40% of scale Alarm level 10% to 90% of full scale
 Hysteresis of 2% of scale
Re-setting of Latched Relays Easily accessible interface on display (if used) or via HART interface (local or remote)
Note Use of the Relay Module or ‘Other’ Communications Module (E.g. Foundation Fieldbus) is mutually exclusive. However, relay function may be used in conjunction
 with standard communication output i.e. 4-20mA with HART.
Relay Specific Functions via Relay status information / Reset of latched conditions / Configuration of relays Forcing of relay state
HART Interface Reset through non intrusive User Interface. Remote Switch closure using Remote Reset input Remotely through HART
Modbus RTU Module (Optional)
Description The Modbus output module provides an Isolated RS485 output to enable the connection of the XNX transmitter to a multi-drop Modbus network
Installation Fitted into housing base either at the factory or in the field by qualified service engineer.
Connections RS485+, RS485-, Drain
Physical Layer Isolated RS485, 1200 to 19.2K Baud
Maximum No. of Nodes 254 XNX compatible transmitters only
Protocol Modbus RTU
Functions Supported As per Foundation Fieldbus Module (Optional) - see above Foundation Fieldbus Module (Optional)
Description Foundation Fieldbus compliant digital communications interface enables connection of the XNX transmitter to a multi-drop Foundation Fieldbus H1 network.
Installation Fitted into housing base either at the factory or in the field by qualified service engineer.
Connections Sig+, Sig- and Screen
Physical Layer Conforms to IEC 1158-2 and ISA 50.02, 31.25Kbits/s
Maximum No. of Nodes 32
Functions Supported Gas Reading Detailed Sensor Information Including: Detailed Fault and Warning Information:
 Gas Name and Units of measurement Optical Signal Level Fault and Alarm History
 Instrument status (OK, warning, fault, over-range) Dynamic Reserve (Excel Only) Zero Calibration
 General/Device Information Raw reading
 Remote zero and span calibration (detector dependent) 24V supply voltage
 Temperature
 RTC (Excel Only)
 Calibration and Configuration status
Further information is available upon request.
* Not available at time of publication. Please call your Honeywell Analytics sales person.
XNXTM is a registered trademark of Honeywell International.
HART® is a registered trademark of the HART Communication Foundation.
MODBUS® is a registered trademark of Schneider Automation Inc.
FoundationTM is a trademark of Fieldbus Foundation.

Honeywell Analytics Lines of Business

Commercial
Gas detection from standalone units to
fully engineered, multi-point systems,
all offering cost-effective regulatory
compliance
» Applications: parking structures,
chillers, mechanical rooms, office
towers, commercial buildings,
shopping centers, swimming pools,
golf courses, schools and universities,
laboratories 

Industrial
Renowned Sieger and Manning gas
detection systems with advanced
electrochemical, infrared and open path
sensing technologies
» Applications: oil and gas, cold storage,
water/wastewater treatment,
chemicals, engine rooms, plastics
and fibers, agriculture, printing and
light industrial 

Portables
Single or multi-gas Lumidor and other
premium detectors with compact,
lightweight designs ranging from
simple alarm only units to advanced,
fully configurable and serviceable
instruments
» Applications: underground utility
and electricity ducts, boiler rooms,
post-fire sites, sewers, industrial
plants, industrial hygiene, first
responder teams, remote fleets 

High Tech/Government
A complete portfolio of gas and chemical
detection instrumentation including
infrared spectroscopy (MST) with no cross
interference, to Chemcassette paperbased
solutions (MDA Scientific) offering
detection down to parts per billion
» Applications: semiconductor
manufacturing and nanotechnology,
aerospace propulsion and safety,
 specialty chemicals industry, research
laboratories, emergency response

Technical Services
24/7 global network includes
post-sales service and Systems
Integration teams
» Emergency call out, service
contracts, on/off-site repair, training
and commissioning
» Complete range of spares,
consumables and accessories

 

Honeywell Analytics Lines of Business