Honeywell Analytics Combustible Gas Detector XNX with 705

Interested in Honeywell’s latest gas detector?
Take a look at the Honeywell OmniPoint™

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The Honeywell 705 combustible gas sensor is a low cost, explosion proof assembly fitted with poison-resistant combustible gas detection elements. Fully encapsulated, it is designed for use in hazardous locations and is fully compatible with the XNX Universal Transmitter.

The sensor is electrocatalytic, and consists of two beads of refractory oxide formed on a fine platinum wire coil. The active bead is coated with a catalyst material whilst the reference bead is glass coated. In the presence of gas the catalyst coated bead promotes the oxidation of the gas, causing it to heat up and so increase in electrical resistance. This change of resistance relative to the reference bead can be measured, and is in direct proportion to the concentration of combustible gas. The signal is converted to an analogue output for direct display on a companion control card as percent LEL (Lower Explosive Limit).

The Honeywell Combustible Gas Detector XNX 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 to deliver both toxic and combustible gas detector options 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 via hand-held communicator.

With 200+ unique configurations, XNX satisfies Class 1/Class 2 intrinsically safe, explosion-proof requirements in upstream/downstream oil, chemical, wastewater and other industries.

XNX Transmitter is recommended:

XNX Brochure
XNX Specifications
XNX Manual

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

Flexible Operation

• 3 versions – supports mV (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
• Multiple communications options include up to 3 relays, MODBUS^®and FOUNDATION^® H1 Fieldbus (pending)
• 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
• Use with conduit or cable installations
• Simple plug-in sensors and replaceable cells
• NEMA 4X IP66 rated for rugged indoor/outdoor use

Cost Effective

• Minimal training required
• One-man operation
• Plug-in sensor replacement
• All necessary accessories included

Applications 

• Onshore Oil & Gas facilities
• Refineries
• Gas Transmission
• Gas Distribution
• LNG terminals
• Gas storage terminals
• Offshore Oil & Gas platforms
• Chemical plants
• Petrochemical plants
• Solvent recovery operations

General Specifications 705 Sensor
Gas and Range: Combustible gases; 0 to 100% LEL
Operating Temperature: -40C to +80C
Operating Humidity: 0 to 99% RH (non-condensing)
Response Time – T90: typically 9 seconds for methane
Signal Output: bridge output (mV)
Linearity: better than ±3%LEL
Accuracy: better than ±3%FSD
Sensitivity: typically 66mV/100%LEL methane
Zero Drift: less than 4% per year
Mounting Thread: 3/4-inch NPT
Construction Materials: Aluminum
Approvals: CSA & UL approved; Class 1, Division 1, Groups B,C & D

General Specifications XNX Transmitter
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: -50°C to +65°C / -67°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
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

Honeywell Analytics

For nearly 50 years, Honeywell Analytics has been protecting people who put their lives on the line every day. It takes a special level of drive and dedication to work in hostile environments, and we believe your workers deserve the same kind of commitment from us when it comes to securing their health and safety. Right from the start, our founders were determined to find better ways to design, build and manufacture reliable gas detection solutions. Through advanced technology and pure industry know-how, Honeywell Analytics continues to improve and evolve our products. Today, we’re proud to partner with customers worldwide who share our vision of vigilance and rely on us to help them protect what matters most. From custom-designed solutions to unmatched training and support, Honeywell Analytics is simply the smartest choice when you demand the best in safety.

Flammable Gas Detection with Explosion-Proof XNX Universal Transmitter – Honeywell Analytics