Honeywell XNX-UTAI-NHNNN Explosion-Proof Gas Transmitter

The Honeywell XNX-UTAI-NHNNN gas detector transmitter delivers high-performance infrared gas monitoring for critical hazardous areas. Plant engineers connect this universal unit from the Honeywell XNX Universal Transmitters series to Searchline Excel open-path detectors. Operators choose the Honeywell XNX-UTAI-NHNNN unit because it ensures continuous power management and reliable long-range gas detection.

Product Summary

• This transmitter processes optical signals from Searchline Excel and Optima Plus infrared detectors seamlessly.
• Marine-grade LM25 aluminum housing provides superior resistance against salt spray and extreme industrial corrosion.
• Built-in local IS HART ports enable fast diagnostics using standard hand-held field communicators directly.

Key Features and Benefits

• The explosion-proof enclosure holds UL, CSA, and FM approvals for high-risk industrial safety installations.
• A wide operating voltage range from 18 to 32 VDC stabilizes sensor operation during plant voltage drops.
• Integrated optical communication circuits provide high immunity against electrical noise and false radio alarms.
• Five separate 3/4 inch NPT entries simplify complex wiring routes without requiring extra junction boxes.
• The compact 2.8 kg frame reduces stress on structural mounting brackets in tough field installations.

Model Breakdown Tree

• XNX Transmitter Base Framework:
  • UTAI Configuration:
    • U: UL, CSA, and FM Safety Approvals
    • T: 5 x 3/4 inch NPT Cable Entry Ports
    • A: Painted Marine-Grade LM25 Aluminum Alloy Housing
    • I: Optima Plus and Searchline Excel Infrared Interface
  • NHNNN Option Matrix:
    • N: No Relay or Bus Option Card Installed
    • H: Local IS HART Interface Port Included
    • NNN: Standard Base Hardware Assembly

Detailed Technical Specifications

• Brand: Honeywell
• Model: XNX-UTAI-NHNNN
• Operating Voltage & Power: 18 to 32 VDC input with 13.2 W maximum power consumption
• Measurement Range & Resolution: 0 to 5 LEL-m path length measurement with sub-second optical resolution
• Frequency Response: Fast optical response time with signal updates every 100 milliseconds
• Sensitivity & Linearity: High optical sensitivity with non-linear compensation curves over long distance paths
• Operating Temperature: -40°C to +65°C operational range with -40°C to +75°C storage rating
• Environmental Protection: IP66 weatherproofing prevents moisture intrusion under heavy rain and dust storms
• Interference Immunity: Internal optical isolation shields internal amplifiers from intense electromagnetic interference

Installation and Mounting Steps

• Mount the enclosure body vertically on a rigid pipe stand or wall structure using the integral mounting lugs.
• Run field wiring through the five 3/4 inch NPT entry ports using approved explosion-proof conduit seals.
• Connect the incoming 24 VDC power supply wires and three-wire 4-20mA loop conductors inside the terminal block.
• Attach the Searchline Excel open-path receiver cable to the dedicated internal transmitter interface card terminals.

Packaging and Shipping Details

• One complete transmitter main body unit packed securely inside impact-resistant foam industrial boxes.
• Integrated intrinsically safe local HART port terminal cap pre-installed for immediate field deployment.
• Global priority express delivery options available via FedEx, UPS, and DHL carriers.
• Honeywell covers every new unit with a standard 12-month manufacturer warranty against factory defects.

Frequently Asked Questions

• Which gas detectors work directly with this specific transmitter build? This unit connects directly with Searchline Excel open-path infrared gas detectors and Optima Plus sensors.
• Does this transmitter model include dry contact alarm relays? No, this hardware configuration relies strictly on 4-20mA current loop and digital HART signal communication.
• What alloy material does Honeywell use for the exterior housing? Honeywell manufactures the rugged protective enclosure body using painted marine-grade LM25 aluminum alloy.
• What power consumption does the system draw with a Searchline Excel receiver? The complete assembly draws a maximum power load of 13.2 Watts under peak operating conditions.
• How do technicians access HART communication features on this unit? Technicians connect handheld calibrators directly to the built-in front intrinsically safe HART terminal port.

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