Honeywell SPXCDXSFXSS

Honeywell SPXCDXSFXSS

Product Overview
The Honeywell SPXCDXSFXSS is a member of the Honeywell Sensepoint XCD family of fixed gas detector transmitters. The Sensepoint XCD platform provides continuous monitoring of combustible gases, toxic gases, and oxygen in indoor and outdoor industrial environments. The transmitter supports catalytic bead, infrared, and electrochemical sensor technologies and is designed for hazardous areas requiring reliable gas detection, alarm signaling, and process safety integration.

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Description

Honeywell SPXCDXSFXSS

Technical Specifications

  • Brand: Honeywell
  • Product Family: Sensepoint XCD
  • Model: SPXCDXSFXSS
  • Detector Type: Fixed gas detector transmitter
  • Gas Detection Types: Combustible gas, toxic gas, and oxygen depending on sensor configuration
  • Sensor Technologies: Catalytic bead, infrared NDIR, and electrochemical
  • Power Supply: 16 to 32 V DC, nominal 24 V DC
  • Analog Output: 4-20 mA, source or sink selectable
  • Digital Communication: RS485 Modbus RTU
  • Relay Outputs: Up to 3 programmable relays depending on configuration
  • Display: LCD with three-color backlight
  • Protection Rating: IP66
  • Operating Temperature: -40 °C to +65 °C

Functional Features

  • Monitors combustible, toxic, and oxygen gases depending on installed sensor.
  • Provides continuous 4-20 mA analog output to gas detection controllers or PLCs.
  • Supports Modbus RTU digital communication for remote monitoring and configuration.
  • Includes programmable alarm and fault relays for local or remote alarming.
  • Features a three-color backlit LCD for clear status indication.
  • Green backlight indicates normal operation.
  • Yellow flashing backlight indicates fault.
  • Red flashing backlight indicates alarm.
  • Supports non-intrusive configuration using a magnetic switch.
  • Allows calibration and maintenance without opening the transmitter housing.
  • Automatically suppresses output during maintenance to reduce false alarms.
  • Supports plug-in sensor replacement for fast maintenance.
  • Provides automatic sensor recognition depending on configuration.

Application Scenarios

  • Oil and gas facilities
  • Chemical and petrochemical plants
  • Refineries and LNG terminals
  • Pharmaceutical manufacturing
  • Food and beverage processing
  • Water and wastewater treatment
  • Power generation plants
  • Manufacturing and utility rooms
  • Confined space perimeter monitoring
  • Indoor and outdoor hazardous area gas detection

Performance Parameters

  • Power input: 16 to 32 V DC
  • Nominal voltage: 24 V DC
  • Analog output: 4-20 mA
  • Digital output: RS485 Modbus RTU
  • Relay outputs: up to 3 programmable relays
  • Display: LCD with green, yellow, and red backlight
  • Protection: IP66
  • Operating temperature: -40 °C to +65 °C
  • Exact gas type, measurement range, accuracy, response time, sensor life, and certification depend on the installed sensor and must be confirmed from the official Sensepoint XCD datasheet.

Material Composition

  • Aluminum or 316 stainless steel explosion-proof enclosure depending on model
  • Sensor housing in stainless steel
  • LCD display module
  • Internal transmitter electronics
  • Relay output circuitry
  • Cable entry ports for power, signal, and sensor connection
  • Integrated mounting plate

Structural Features

  • Rugged industrial transmitter housing.
  • Local plug-in sensor interface at the bottom of the transmitter.
  • Three-color backlit LCD for local status display.
  • Magnetic switch for non-intrusive operation.
  • Cable entries typically including M20 or ¾-inch NPT connections.
  • Integrated mounting bracket for wall or pipe installation.
  • Removable terminal blocks for wiring access.
  • Designed for hazardous area installation depending on certification.

Working Principle
The SPXCDXSFXSS continuously samples the surrounding atmosphere through its installed gas sensor. For combustible gases, it may use catalytic bead or infrared NDIR sensing. For toxic gases and oxygen, it typically uses electrochemical sensing. The transmitter converts the sensor signal into a standardized 4-20 mA output and updates the local LCD display. When gas concentration reaches a configured alarm setpoint, the transmitter activates its programmable relays and changes the backlight to red. Fault conditions are indicated by a yellow flashing backlight. The transmitter can also communicate diagnostic and measurement data through Modbus RTU.

Installation Requirements

  • Install the detector in locations where target gas accumulation is most likely.
  • Follow hazardous area classification and certification requirements.
  • Maintain proper distance from ignition sources and ventilation effects.
  • Use suitable cable glands and conduit entries.
  • Connect power, 4-20 mA output, relay circuits, and Modbus wiring according to the wiring diagram.
  • Ensure correct grounding and shielding for analog and communication signals.
  • Mount the transmitter securely using the integrated mounting plate.
  • Verify sensor type and range before commissioning.
  • Perform bump testing and calibration after installation.

Precautions

  • Do not open the transmitter in a live hazardous area unless permitted by site safety rules.
  • Verify that the installed sensor matches the target gas and measurement range.
  • Do not expose the sensor to silicone, sulfides, or other substances that may poison catalytic or electrochemical sensors unless approved.
  • Perform regular calibration according to site procedures.
  • Use the magnetic switch for configuration to avoid unnecessary housing opening.
  • Confirm exact gas detection performance, approvals, and electrical ratings from the official Honeywell Sensepoint XCD documentation.

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