XNX Universal Transmitter

The XNX™ Universal Transmitter, now with HART EDDL/DTM, 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) & Device Type Manager (DTM) software provides users with an at-a-glance indication of the health of their gas detectors in the field. 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.
  • 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 LELm 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
  • Cost Effective
    • Minimal training required
    • One-man operation
    • Plug-in Sensor replacement
    • All necessary accessories included
  • 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
    • 4-20 mA with HART® as standard
    • HART Enhanced Device Description Language (EDDL) & Device Type Manager (DTM) software*
    • Multiple communications options include up to 3 relays, Modbus® and FOUNDATION® H1 Fieldbus
    • Optional local IS port for handheld HART configurator
  • 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
  • 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
  • Certifications
    • UL, CSA, FM, DEMKO, DEKRA, InMetro, TUV, ABS, HART, IELDBus Foundation, GOST and KTL approved for Hazardous Locations, Gas Performance and SIL 2 ratings among others
    • Class I, Div 1, Groups A, B, C & D; Class II, Div 1, Groups F and G; Hazardous Locations
    • Class I Zone 1 Group IIC, Class II, Zone 20 & 21
    • Intrinsically safe barriers for HART and EC connections
    • For additional information on certifications and approvals contact Honeywell Analytics
General Specifications
MaterialLM25 Aluminum, painted (SS316 painted optional)
Cable Entries5 conduits/cable entries – (2 right, 2 left, 1 bottom) Available in ¾” NPT, or M25
TerminationCage Clamp pluggable Terminal Blocks with retaining screws, 0.5 to 2.5mm (12-28 AWG)
MountingIntegral 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 interfaceStandard Custom Backlit LCD. 2.5” High Resolution DOT Matrix Display. Discrete Alarm and Status indication. Reliable Non-Intrusive 4 button interface magnetic wand access.
Signal0-22mA analog current loop output with HART (version 6) compatible standard. Optional relay or Modbus.
Temperature-40°C to +65°C / -40°F to +150°F (sensor dependent)
Humidity20 to 90% RH non-condensing
IP RatingNEMA 4X IP66
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 gasesCSA 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 SafetyTUV EN 61508 SIL 2 Component Certification
Display Module & User Interface (Standard)
Display TypeBacklit LCD
Information DisplayedBase 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 Operating Status Indication:
Security settings allow multi level operator access for set-up, configuration and calibration
Event history stores Time and Date of all Alarm, Diagnostic, Configuration events
InterfaceMagnetic wand with terminal screwdriver (supplied each unit)
4-20mA & HART (Standard Supply)
DescriptionFully configurable isolated 4-20mA & HART output module providing current sink, current source and isolated modes of operation. (supports HART 6.0 protocol)
Non-intrusive InterfaceOptional local IS port to enable HOT connection of a HART handheld configurator
Operating ModesCurrent sink / Current source / Isolated current sink /Conventional or with HART data
Output Range0 to 22mA
4-20mA Signal Accuracy+/- 1% FS
Max loop resistance600 Ohms at 24Vdc loop supply
Functions Supported
via HART
Gas Reading
Gas Name and Units of measurement
4-20mA signal level
General/Device Information
Configuration Temperature
Forcing of 4-20mA output
Detailed sensor Information Including:
Optical Signal Level
Dynamic Reserve (Excel Only)
Raw reading
24V supply voltage
RTC (Excel Only):
Calibration and Configuration status
Detailed Fault and Warning Information
Fault and Alarm History
Zero Calibration
Local IS HART Port (Optional)
DescriptionProvides externally accessible IS connections to the XNX transmitter to enable HOT connection of HC275/375 HART or equivalent hand held configurator.
InstallationFitted to one of the cable entries on the XNX transmitter
Environmental ProtectionTerminals protected by cover to IP 66 when not in use
Relay Module (Optional)
DescriptionProvides 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.
InstallationFitted into housing base either at the factory or in the field by qualified service engineer.
RatingMaximum: 240 VAC, 5A (non inductive load) / 24 VDC 5A CES
Minimum: 5V, 10mA (non inductive load)
Electrical ConnectionsFault: Common, Normally Open, Normally Closed
Alarm 1: Common, Normally Open, Normally Closed
Alarm 2: Common, Normally Open, Normally Closed

Fault Relay:
Normally energized
Non latching
Signal inhibit as fault

Alarm 1 / 2 Relays:
Normally de-energized
Non latching
Alarm rising on gas reading
Alarm level 20% and 40% of scale
Hysteresis of 2% of scale
Configurable Options

Fault Relay:
Normally energized / normally de-energized

A1 / A2 Relays:
Normally energized / de-energized
Latching / non latching
Alarm on rising / falling
Alarm level 10% to 90% of full scale
Re-setting of Latched RelaysEasily accessible interface on display (if used) or via HART interface (local or remote)
NoteUse 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 HART InterfaceRelay status information / Reset of latched conditions / Configuration of relays Forcing of relay state
Reset through non intrusive User Interface. Remote Switch closure using Remote Reset input Remotely through HART
Foundation Fieldbus Module (Optional)
DescriptionFoundation Fieldbus compliant digital communications interface enables connection of the XNX transmitter to a multi-drop Foundation Fieldbus H1 network.
InstallationFitted into housing base either at the factory or in the field by qualified service engineer.
ConnectionsSig+, Sig- and Screen
Physical LayerConforms to IEC 1158-2 and ISA 50.02, 31.25Kbits/s
Maximum No. of Nodes32
Functions SupportedGas Reading
Gas Name and Units of measurement
Instrument status (OK, warning, fault, over-range)
General/Device Information Raw reading
Remote zero and span calibration (detector dependent)
Detailed Sensor Information Including:
Optical Signal Level
Dynamic Reserve (Excel Only)
Raw reading
24V supply voltage
RTC (Excel Only)
Calibration and Configuration status
Detailed Fault and Warning Information:
Fault and Alarm History
Zero Calibration
Modbus RTU Module (Optional)
DescriptionThe Modbus output module provides an Isolated RS485 output to enable the connection of the XNX transmitter to a multi-drop Modbus network
InstallationFitted into housing base either at the factory or in the field by qualified service engineer.
ConnectionsRS485+, RS485-, Drain
Physical LayerIsolated RS485, 1200 to 19.2K Baud
Maximum No. of Nodes254 XNX compatible transmitters only
ProtocolModbus RTU
Functions SupportedAs per Foundation Fieldbus Module (Optional) - see above
XNX Accessories