XNXXSN1SS Smart Sensor | Honeywell | Nitrogen Dioxide Detector

XNXXSN1SS | Honeywell Smart Sensor for NO₂

This smart electrochemical sensor specifically detects nitrogen dioxide (NO₂) with high precision. It integrates a Modbus RTU output for seamless connection to multi-drop networks. The isolated RS485 interface supports up to 254 nodes, making it ideal for large-scale industrial monitoring. Factory or field installation offers flexible deployment options.

Technical Specifications

• Brand: Honeywell
• Model: XNXXSN1SS
• Gas: Nitrogen Dioxide (NO₂)
• Sensor Type: Electrochemical (EC) Smart Sensor
• Detection Range: 5.0 to 50.0 ppm (default 10.0 ppm)
• Lower Detectable Limit: 1.5 ppm
• Response Time (T50): < 15 sec
• Response Time (T90): < 30 sec
• Accuracy: ±0.2 ppm
• Operating Temperature: -20°C to +55°C (-4°F to 131°F)
• Physical Layer: Isolated RS485, 1200 to 19.2K baud
• Protocol: Modbus RTU
• Max Nodes: 254 (XNX compatible)
• Housing: Stainless Steel
• Calibration Default: 5 ppm (30-70% of full scale)

Key Features & Performance

• Smart pre-configured sensor – ready for immediate operation.
• Hot-swappable – replace without transmitter power-down.
• Excellent linearity and sensitivity across the full range.
• High resistance to interfering gases.
• Diagnostic fault detection with internal alerts.
• Supports Modbus RTU functions as per Foundation Fieldbus module.

Installation & Connectivity

• Installation: Factory-installed in display module or field-installed by qualified engineer.
• Connections: RS485+, RS485-, Drain.
• Network: Multi-drop Modbus RTU network.
• Isolated RS485 ensures stable communication in noisy environments.

Maintenance & Calibration

• Calibration gas range: 30% to 70% of selected full scale.
• Default calibration point: 5 ppm.
• One-person calibration via transmitter interface.
• Auto-recognition of sensor ID reduces setup errors.
• Recommended annual calibration for optimal accuracy.

Typical Applications

• NO₂ monitoring in chemical plants and refineries.
• Ambient air quality monitoring in urban areas.
• Industrial hygiene and safety compliance.
• Fume hood and exhaust system monitoring.

Diagnostic & Troubleshooting

• Sensor health status displayed on transmitter.
• Fault codes indicate end-of-life or wiring issues.
• Response time verification ensures system integrity.

Frequently Asked Questions (FAQ)

• Q: What devices are compatible with this sensor?
  A: Works with Honeywell XNX Universal Transmitters and Series 3000 MkII/MkIII.
• Q: Can I use this sensor for other gases?
  A: No, it is specifically calibrated for NO₂. Cross-sensitivity is minimal.
• Q: What is the recommended calibration frequency?
  A: Annual calibration is recommended, or more frequently in harsh environments.
• Q: How do I choose between this and the XNXXSG1SS?
  A: Choose XNXXSN1SS for NO₂ detection; XNXXSG1SS is for H₂. Select based on your target gas.
• Q: Is the Modbus output mandatory?
  A: Yes, this variant includes the isolated RS485 Modbus output. It is mutually exclusive with relay or Fieldbus options.

Why Buy From Oiltech Controls?

• 15+ years in industrial automation – trusted expertise.
• Global shipping with FedEx, UPS, or DHL (24-28 hours dispatch).
• Every unit tested for functionality before shipment.
• New surplus and professionally refurbished options available.
• 12-month warranty for complete peace of mind.
• Specialist support for obsolete systems like Modicon Quantum.

Contact: info@oiltechcontrols.com or +86 158 8020 0923 (WhatsApp).

Shipping: FedEx, UPS, DHL – fast global delivery.

Warranty: 12 months against manufacturing defects.

Oiltech Controls Review: Proven reliability in demanding gas detection applications.

Oiltech Controls’s Insight: This NO₂ sensor offers the best balance of speed and accuracy for industrial safety.

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