XNX Universal Transmitter

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XNX Universal Transmitter Gas Monitor
BW Technologies by Honeywell

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.

  • Flammable gas detection 0 to 100% LFL/LEL

  • Flexible operation options

  • Easy to read tri-color backlit display

  • Minimal training required

  • 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
  • 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)

  • Oxygen

  • Hydrogen Sulphide

  • Carbon Monoxide

  • Sulphur Dioxide

  • Ammonia

  • Chlorine

  • Chlorine Dioxide

  • Nitrogen Monoxide

  • Nitrogen Dioxide

  • Hydrogen

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XNX Universal Transmitter Datasheet
XNX Universal Transmitter User Manual
XNX Universal Transmitter Quick Guide


  • 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
Technical Specifications
Material Housing: 5-coat marine finish painted aluminium alloy LM25 or 316 stainless steel
Weight (approx) Aluminium alloy LM25 : 2.8kg (6.2lbs). 316 stainless steel: 5kg (11lbs)
Mounting Surface mount via integral mounting lugs. Optional pipe mounting kit suitable for Ø100mm to 150mm (Ø4” to 6”) pipe. Optional ceiling mounting bracket
Entries 5 conduit/cable entries (2 right, 2 left, 1 bottom). Entry size M25 for ATEX/IECEx versions or ¾”NPT for UL/CSA certified versions
Dimensions 160mm x 197mm x 114mm (6.1″ x 7.8″ x 4.5″)
IR Rating IP66 in accordance with EN60529:1992. NEMA 4X
Operating Temperature -40ºC to +65ºC (-40ºF to +149ºF)
Operating Humidity 0-99%RH (non condensing)
Operating Pressure 90-110kPa
Storage Conditions -40ºC to 75ºC (-40ºF to 167ºF), 0-99% non-condensing
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
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
Gas Cartridge P/N Selectable Full Scale Range
H2S (LoLo) XNXXSH3SS n/a
H2S (Lo) XNXXSH1SS 10.0 to 50.0ppm
H2S (Hi) XNXXSH2SS 50 to 500ppm
CO XNXXSC1SS 100 to 500ppm
SO2(Lo) XNXXSS1SS 5.0 to 20.0ppm
SO2(Hi) XNXXSS2SS 20.0 to 50.0ppm
NH3(Lo) XNXXSA1SS 50 to 200ppm
NH3(Hi) XNXXSA2SS 200 to 1,000ppm
CL2(Hi) XNXXSL1SS 5.0 to 20.0 ppm
NO2 XNXXSN1SS 5.0 to 50.0 ppm
H2 (Lo) XNXXSG1SS n/a
H2 (Hi) XNXXSG2SS n/a

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Phone Number

Email Address

Sydney Office

  • Office : 5 Aspinall Place, Mulgrave, NSW 2756