Crowcon Xgard Fixed Gas Detector

Overview

Crowcon Xgard Fixed Gas Detector | Reliable Fixed Gas Detection for Flammable, Toxic & Oxygen Gas Monitoring

The Crowcon Xgard Fixed Gas Detector is a versatile and highly reliable fixed gas detection solution designed for continuous monitoring of flammable gases, toxic gases, oxygen (O₂), and carbon dioxide (CO₂) across a wide range of industrial, marine, offshore, oil & gas, petrochemical, pharmaceutical, water treatment, and commercial applications. Manufactured by Crowcon Detection Instruments Ltd., the Xgard series has earned a strong global reputation for durability, flexibility, and dependable performance in hazardous environments.

Unlike many fixed gas detectors that are limited to a single sensing technology or gas type, the Crowcon Xgard series offers multiple detector variants to suit virtually any gas detection requirement. The product range includes electrochemical, catalytic bead, infrared (IR), and thermal conductivity sensing technologies, enabling users to detect combustible gases, toxic gases, oxygen deficiency or enrichment, and high-concentration gases with exceptional accuracy and long-term stability.

The Crowcon Xgard family consists of several models—Xgard Type 1, Type 2, Type 3, Type 4, Type 5, and Type 6—each designed for specific hazardous area classifications, environmental conditions, and gas monitoring applications. This modular approach allows engineers to select the most appropriate detector while maintaining consistent installation practices and maintenance procedures across an entire facility.

The Xgard detector is widely installed in offshore platforms, FPSOs, refineries, LNG terminals, LPG storage facilities, chemical plants, power generation stations, pharmaceutical manufacturing plants, food processing facilities, wastewater treatment plants, laboratories, marine vessels, and industrial processing units, where continuous gas monitoring is essential to ensure personnel safety, regulatory compliance, and operational reliability.

Designed for harsh industrial environments, the Crowcon Xgard features rugged explosion-proof or intrinsically safe enclosures (depending on the model), excellent corrosion resistance, weatherproof construction, and compatibility with industry-standard 4–20 mA analog output, making integration with PLCs, DCS, SCADA, Fire & Gas Systems, and Emergency Shutdown (ESD) systems straightforward and reliable.

With proven sensing technologies, worldwide hazardous area certifications, and a reputation for dependable operation, the Crowcon Xgard remains one of the most widely specified fixed gas detector families for industrial gas detection systems worldwide.

Key Features of Crowcon Xgard Fixed Gas Detector

The Crowcon Xgard offers a flexible platform capable of monitoring numerous gases using different sensing technologies.

Multiple Detection Technologies

The Xgard series supports several proven sensing technologies, including:

• Electrochemical Sensors

• Catalytic Bead Sensors

• Infrared (IR) Sensors

• Thermal Conductivity Sensors

This flexibility allows the detector to monitor a wide variety of hazardous gases while meeting different industrial application requirements.

Wide Gas Detection Capability

Depending on the selected sensor, the Crowcon Xgard can detect:

Flammable Gases

• Methane (CH₄)

• LPG

• Propane

• Butane

• Hydrogen (H₂)

• Natural Gas

Toxic Gases

• Carbon Monoxide (CO)

• Hydrogen Sulphide (H₂S)

• Ammonia (NH₃)

• Chlorine (Cl₂)

• Sulphur Dioxide (SO₂)

• Nitrogen Dioxide (NO₂)

• Hydrogen Chloride (HCl)

• Hydrogen Cyanide (HCN)

Oxygen Monitoring

• Oxygen (O₂)

Carbon Dioxide

• CO₂ (Model Dependent)

Modular Detector Family

The Crowcon Xgard series is available in multiple configurations for different hazardous locations.

Available models include:

• Xgard Type 1

• Xgard Type 2

• Xgard Type 3

• Xgard Type 4

• Xgard Type 5

• Xgard Type 6

This allows engineers to select the most suitable detector for each application while maintaining a common product platform.

Rugged Industrial Construction

The Xgard is designed for demanding industrial environments.

Key construction features include:

• Explosion-Proof Models

• Intrinsically Safe Models

• Corrosion-Resistant Materials

• Marine-Grade Construction

• Weatherproof Housing

• Long Operational Life

The detector performs reliably in both indoor and outdoor hazardous areas.

Reliable Continuous Monitoring

The Crowcon Xgard provides uninterrupted monitoring of gas concentrations to help identify leaks before they become dangerous.

Advantages include:

• Fast Gas Detection

• High Measurement Accuracy

• Excellent Long-Term Stability

• Reliable Alarm Activation

• Low Maintenance Requirements

Industry-Standard Communication

The Xgard integrates easily into existing safety systems.

Supported interfaces include:

• 4–20 mA Analog Output

• PLC Integration

• DCS Integration

• SCADA Systems

• Fire & Gas Systems

• Emergency Shutdown Systems (ESD)

Flexible Installation

The detector can be installed in a variety of industrial locations.

Installation options include:

• Wall Mounting

• Pipe Mounting

• Ceiling Mounting (Application Dependent)

• Hazardous Area Installation

• Indoor Installation

• Outdoor Installation

International Certifications

The Crowcon Xgard complies with internationally recognised hazardous area standards.

Typical certifications include:

• ATEX

• IECEx

• UL

• CSA

• CE

These certifications allow installation in hazardous industrial facilities around the world.

Benefits of Crowcon Xgard Fixed Gas Detector

The Crowcon Xgard offers numerous operational benefits.

Key Benefits

• Multiple sensing technologies

• Supports numerous gas types

• Flexible installation options

• Rugged industrial construction

• Continuous gas monitoring

• Reliable long-term performance

• Easy integration with control systems

• Worldwide hazardous area approvals

• Reduced maintenance costs

• Long sensor life

• Suitable for marine, offshore, and industrial applications

• Trusted Crowcon quality

Why Choose Crowcon Xgard?

The Crowcon Xgard is one of the industry's most flexible fixed gas detection platforms. Its wide choice of sensor technologies and detector configurations allows users to monitor virtually any hazardous gas while maintaining a consistent installation and maintenance approach.

Whether protecting offshore platforms, chemical plants, refineries, marine vessels, or industrial manufacturing facilities, the Xgard delivers dependable gas detection performance backed by Crowcon's decades of experience in industrial safety solutions.

Its rugged design, proven reliability, and broad application range make it an excellent investment for organisations seeking long-term gas detection performance with minimal maintenance.

Working Principle

The Crowcon Xgard operates using different sensing technologies depending on the gas being monitored.

• Electrochemical sensors measure toxic gases and oxygen by generating an electrical signal proportional to gas concentration.

• Catalytic bead sensors detect combustible gases through oxidation on a heated catalyst.

• Infrared (IR) sensors detect hydrocarbon gases by measuring infrared light absorption.

• Thermal conductivity sensors measure high concentrations of gases by detecting changes in thermal conductivity.

The detector continuously monitors gas concentrations and transmits measurement data through a 4–20 mA analog output to connected PLC, DCS, SCADA, or Fire & Gas systems. When gas levels exceed configured alarm thresholds, the system activates alarms and initiates appropriate safety actions.

Typical Applications

The Crowcon Xgard Fixed Gas Detector is widely used in:

Marine & Shipping

• Engine Rooms

• Pump Rooms

• Cargo Areas

• Fuel Storage Compartments

• LNG Carriers

• Oil Tankers

Offshore Oil & Gas

• Offshore Platforms

• FPSOs

• Drilling Rigs

• Production Modules

• Compressor Stations

Petrochemical Industry

• Oil Refineries

• Chemical Plants

• Tank Farms

• Solvent Storage Areas

• Hydrocarbon Processing Units

LNG & LPG Facilities

• LNG Storage Tanks

• LNG Import Terminals

• LPG Storage Facilities

• Loading Arms

• Cryogenic Plants

Industrial Applications

• Power Generation Plants

• Water & Wastewater Treatment Plants

• Pharmaceutical Manufacturing

• Food & Beverage Processing

• Laboratories

• Utility Plants

• Manufacturing Facilities

Crowcon Xgard Product Family Overview

The Crowcon Xgard series is available in six different models, each designed for specific gas detection applications and hazardous area classifications.

Xgard Type 1

• Intrinsically Safe Design

• Electrochemical Sensors

• Toxic Gas Detection

• Oxygen Monitoring

• Safe Area Controller Connection

Ideal for chemical plants, laboratories, and pharmaceutical facilities.

Xgard Type 2

• Flameproof Construction

• Electrochemical Technology

• Toxic Gas Detection

• Oxygen Detection

• Hazardous Area Installation

Suitable for offshore platforms, oil refineries, and industrial plants.

Xgard Type 3

• Flameproof Housing

• Catalytic Bead Sensor

• Flammable Gas Detection

• 0–100% LEL Measurement

Designed for combustible gas monitoring in hazardous areas.

Xgard Type 4

• High-Concentration Gas Monitoring

• Thermal Conductivity Sensor

• Gas Purity Monitoring

• Inert Gas Applications

Commonly used where gas concentrations exceed the Lower Explosive Limit (LEL).

Xgard Type 5

• Infrared (IR) Technology

• Hydrocarbon Gas Detection

• Poison Resistant

• Low Maintenance

• Long Sensor Life

Ideal for offshore platforms, LNG terminals, petrochemical plants, and refineries.

Xgard Type 6

• Safe Area Detector

• Commercial Applications

• Light Industrial Installations

• Flexible Sensor Options

Suitable for utility rooms, laboratories, and non-hazardous locations.

Detection Technologies

The Crowcon Xgard supports multiple sensing technologies depending on the application.

Electrochemical Sensors

Designed for:

• Carbon Monoxide (CO)

• Hydrogen Sulphide (H₂S)

• Oxygen (O₂)

• Ammonia (NH₃)

• Chlorine (Cl₂)

• Sulphur Dioxide (SO₂)

• Nitrogen Dioxide (NO₂)

• Hydrogen Cyanide (HCN)

• Hydrogen Chloride (HCl)

Advantages

• High sensitivity

• Excellent accuracy

• Fast response

• Stable long-term operation

Catalytic Bead Sensors

Suitable for combustible gases including:

• Methane

• Propane

• LPG

• Butane

• Hydrogen

• Natural Gas

Advantages

• Proven technology

• Fast combustible gas detection

• Reliable industrial performance

Infrared (IR) Sensors

Infrared sensing technology provides reliable hydrocarbon gas detection.

Typical gases include:

• Methane

• Propane

• Butane

• LPG

• LNG Vapours

• Hydrocarbon Vapours

Advantages

• Immune to catalyst poisoning

• Long service life

• Low maintenance

• Excellent stability

Thermal Conductivity Sensors

Used for:

• High concentration gas monitoring

• Gas purity measurement

• Inert gas applications

Suitable where gas concentrations exceed standard LEL measuring ranges.

Gas Types Detected

The Crowcon Xgard supports detection of numerous industrial gases.

Flammable Gases

• Methane (CH₄)

• LPG

• Propane

• Butane

• Hydrogen

• Ethane

• Natural Gas

Toxic Gases

• Carbon Monoxide (CO)

• Hydrogen Sulphide (H₂S)

• Ammonia (NH₃)

• Chlorine (Cl₂)

• Sulphur Dioxide (SO₂)

• Nitrogen Dioxide (NO₂)

• Hydrogen Chloride (HCl)

• Hydrogen Cyanide (HCN)

Oxygen Monitoring

• Oxygen (O₂)

Carbon Dioxide

• CO₂ (Selected Models)

Measuring Ranges

Typical measuring ranges include:

Combustible Gases

• 0–100% LEL

Carbon Monoxide (CO)

• 0–500 ppm

• 0–1,000 ppm

Hydrogen Sulphide (H₂S)

• 0–100 ppm

Oxygen (O₂)

• 0–25% Vol

Carbon Dioxide (CO₂)

• Model Dependent

Note: Measuring ranges vary depending on the selected sensor and gas type.

Communication & Outputs

The Crowcon Xgard easily integrates with industrial safety systems.

Standard Output

• 4–20 mA Analog Output

Compatible Systems

• PLC Systems

• DCS Systems

• SCADA Systems

• Fire & Gas Systems

• Emergency Shutdown Systems (ESD)

• Crowcon Gas Controllers

Installation Features

The Crowcon Xgard has been designed for flexible installation.

Installation options include:

• Wall Mount

• Pipe Mount

• Ceiling Mount (Application Dependent)

• Hazardous Area Installation

• Indoor Installation

• Outdoor Installation

• Corrosion-Resistant Construction

Industries Served

The Crowcon Xgard is trusted across numerous industries.

Marine Industry

• Oil Tankers

• LNG Carriers

• Cargo Ships

• Engine Rooms

• Pump Rooms

Offshore Oil & Gas

• Offshore Platforms

• FPSOs

• Drilling Rigs

• Production Facilities

Petrochemical Industry

• Oil Refineries

• Chemical Plants

• Tank Farms

• Solvent Storage Areas

LNG & LPG Facilities

• LNG Terminals

• LPG Storage

• Cryogenic Plants

• Loading Facilities

Industrial Applications

• Pharmaceutical Manufacturing

• Food Processing

• Power Plants

• Water Treatment Plants

• Wastewater Facilities

• Laboratories

• Manufacturing Plants

Certifications & Compliance

The Crowcon Xgard complies with globally recognised safety standards.

Typical certifications include:

• ATEX

• IECEx

• UL

• CSA

• CE

• SIL Compatible (Selected Models)

These approvals allow deployment in hazardous industrial and marine environments worldwide.