XNXXSS2SS Honeywell XNX Modbus Transmitter – Isolated RS485 Cl₂

Product Overview

• Honeywell XNXXSS2SS – XNX Universal Transmitter
• Isolated RS485 Modbus RTU output module
• Factory or field installable (by qualified engineer)
• For Cl₂ (Lo) gas – Chlorine detection

Technical Specifications – Tree Structure

• Model: XNXXSS2SS
  • Brand: Honeywell
  • Series: XNXX Universal Transmitter
  • Type: Modbus RTU output module
• Gas & Range: Chlorine (Cl₂ Lo)
  • Default range: 5.00 ppm
  • Lower Detectable Limit: 0.15 ppm
  • Cal gas range: 30–70% of full scale
  • Default cal point: 2.0 ppm
• Performance:
  • Response T50: < 20 sec
  • Response T90: < 60 sec
  • Accuracy: < ±0.2 ppm
• Communication:
  • Physical: Isolated RS485
  • Baud rate: 1200 – 19.2K
  • Max nodes: 254 (XNX compatible)
  • Functions: same as Foundation Fieldbus option
• Environment:
  • Operating temp: -10°C to 55°C (14°F to 131°F)
• Installation:
  • Option: factory installed in display module
  • Or field install by qualified service engineer
• Connections: RS485+, RS485-, Drain

Expert Review – Manager’s Insight

• “Reliable chlorine detection for critical safety.”
• Easy Modbus integration – saves wiring time
• Accurate low-level Cl₂ measurement (0.15 ppm LOD)
• Works in harsh environments (-10°C to 55°C)
• Ideal for water treatment and chemical plants

Typical Applications & Compatible Equipment

• Water treatment – chlorine dosing control
• Chemical processing – leak detection
• Pulp & paper bleaching areas
• Pharmaceutical manufacturing
• Works with PLC, DCS, and SCADA via Modbus

Comparison with Similar Models

• XNXAMRSS – ammonia version (NH₃)
• XNXH2SS – hydrogen sensor module
• XNXO2SS – oxygen transmitter
• All share the same XNX platform and Modbus option

FAQ – Professional Questions

• Can I install the Modbus module myself?
• Yes, but only a qualified service engineer should do field installation.
• Does this module work with Foundation Fieldbus?
• No, Modbus and Fieldbus are mutually exclusive options.
• How many transmitters can I connect?
• Up to 254 XNX-compatible units on one Modbus network.
• What is the default calibration gas value?
• Default cal point is 2.0 ppm Cl₂.
• Is the output isolated?
• Yes, RS485 output is fully isolated for noise immunity.

Experience-Based Q&A & Buying Guide

• “I need fast response for safety shutdown.”
• Choose this model – T90 < 60 sec, T50 < 20 sec.
• “What if my ambient temp exceeds 50°C?”
• Operating range is -10°C to 55°C – use sunshade or cooling if higher.
• “Can I use a longer RS485 cable?”
• Keep total length under 1200 m for reliable communication.
• Warranty & Shipping
• 12-month warranty against defects.
• 24-hour dispatch – ships via FedEx, UPS, or DHL.

Selection Guide

• Confirm gas type – this unit is for Chlorine (Cl₂ Lo)
• Check your network protocol – Modbus RTU required
• Verify temperature range in your plant
• Choose factory-installed option for faster startup

For inquiries, contact:
sales@powergearx.com
+86 18030005825 (WhatsApp)

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